sv300service manual

Servo Ventilator 300/300A

Service Manual

E382 E380E 061 01 03 01

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E382 E380E 061 01 03 01 Siemens-Elema AB 3

• The Servo Ventilator 300/300A must beserviced at regular intervals by speciallytrained personnel. The service intervals,1000 and 3000 operating hours, aredescribed in the Operating Manual. Anymaintenance must be noted in a logbook provided for that purpose inaccordance with national regulations.We recommend that service is done asa part of a service contract withSiemens.

• A 1000 hour overhaul must be performedafter 1000 hours of operation or, at thelastest, every six months. In addition,the ventilator shall undergo a technicalsafety check (Function check) twice ayear, at six months intervals or accordingto national regulations.

• A 3000 hour overhaul must be performedafter every 3000 hours of operation or,at the latest, once every year.

• The internal batteries shall be replacedevery 3 years according to instructions inthis Service Manual. The stated batteryback-up time, approx. 30 minutes, canbe guaranteed only if they are used aspower supply back-up at mains failure.

• The battery on PC 1587 COMPUTERINTERFACE shall be replaced every 5 yearsaccording to instructions in this ServiceManual.

ImportantTo the responsible service personnel

• The contents of this document are notbinding. If any significant difference isfound between the product and thisdocument, please contact Siemens forfurther information.

• We reserve the right to modify productswithout amending this document oradvising the user.

• Only Siemens authorized personnel shallbe permitted to service or repair theServo Ventilator 300/300A. OnlySiemens-Elema exchange parts orgenuine spare parts must be used. PCboards (spare or exchange parts) mustalways be kept in a package for sensitiveelectronic devices.

• Siemens will not otherwise assumeresponsibility for the materials used, thework performed or any possibleconsequences of same.

• The device complies with therequirements of the MedicalDevice Directive 93/42/EEC.

• Old non-functioning batteriesand O

2 cells must be returned

to the place of purchase or toa place where they can bedisposed of properly.Batteries and O

2 cells must

not be disposed of withordinary waste.

Important

Pb

4 Siemens-Elema AB E382 E380E 061 01 03 01


Notes

Notes



Contents

1. Introduction ............................................................................ 7

2. Description of functions....................................................... 21

3. Disassembling and assembling ......................................... 81

4. Service procedures............................................................... 103

5. Troubleshooting ..................................................................... 109

6. Product change history ........................................................ 113

7. Index ........................................................................................ 115

8. Diagrams ................................................................................. 121

1

2

3

4

5

6

7

8

Contents



Notes

Notes

Servo Ventilator 300/300A Introduction


1

1. IntroductionMain units ................................................ 8

Basic principles........................................ 12


Introduction Servo Ventilator 300/300A

1

Main units

The Servo Ventilator 300 can be divided intotwo main units:

• Control unit (1). The control unit consistsof the panel section (2) and the controlsection (3).

• Patient unit (4). The patient unit consistsof the pneumatic section (5) and thepower section (6).

The patient unit and the control unit areconnected to each other with the inter-connection cable (7).

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1

Control unit

The control unit consists of the controlsection which is a housing with a number ofPC boards. The panel section, attached tothe control section, is the other part of thecontrol unit.

With the panel section removed from thecontrol section, the following parts areaccessible:

• Front panel controls

• PC 1614 PANEL INTERFACE (1) with PC 1588MICROPROCESSOR MODULE and PAN-PROM

• PC 1745 AUTOMODE PANEL INTERFACE (2). Onlyfor SV 300A.

• PC 1617 CONTROL INTERCONNECTION (3).

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1

All PC boards in the control section (exceptPC 1617 mentioned above) are accessiblewhen the control section cover is removed.These PC boards are:

• PC 1605 REFERENCE & TIMING (1) with PC1588 MICROPROCESSOR MODULE and REF-PROM

• PC 1616 INSPIRATORY CONTROL (2) withPC 1588 MICROPROCESSOR MODULE and MIX-PROM

• PC board (3);

– PC 1665 COMPUTER INTERFACE DUMMY or

– Optional PC 1587 COMPUTER INTERFACE (3)with COM-PROM

• PC 1608 MONITORING (4) with PC 1588MICROPROCESSOR MODULE and MON-PROM.

Patient unit

The upper part of the patient unit is thepneumatic section. Under the lid of thepneumatic section you will find the:

• Inspiratory channel (1) including O2 cell

• Expiratory channel (2) including flowtransducer.

The inspiratory valves (gas modules) arelocated in three different slots in thepneumatic section:

• Inspiratory valve unit – AIR (3)

• Inspiratory valve unit – O2 (4)

• Inspiratory valve unit – Optional (5).The valve dummy in the third slot can bereplaced by an inspiratory valve foradministration of e. g. NO gas or byequipment for nebulizing drugs (ServoUltra Nebulizer 345). These products aredescribed in separate documents.

3 4

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1

When the pneumatic section casing and thecover plate is removed, the following partsare accessible:

• PC 1615 EXPIRATORY FLOW LINEARIZATION (1)with PC 1588 MICROPROCESSOR MODULE andLIN-PROM

• Housing (2) containing PC 1585 CURRENTCONTROL and PC 1586 CURRENT POWER

• Expiratory valve (3)

• PC 1622 VALVE CONTROL (4)

• PC 1611 EXPIRATORY PRESSURE AMPLIFIER (5)

• Safety valve (6) with PC 1613 SAFETY VALVEDRIVER

• PC 1611 INSPIRATORY PRESSURE AMPLIFIER (7)

• PC 1607 PNEUMATIC INTERCONNECTION (8).

The lower part of the patient unit is thepower section. With the pneumatic sectionseparated from the power section thefollowing parts are accessible:

• Mains power inlet (1)

• External battery inlet (2)

• Operating time meter (3)

• Batteries (4)

• Transformer (5)

• Capacitor (6)

• Auxiliary equipment outputs (7)

• PC 1618 POWER SUPPLY (8).

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1

Basic principles

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1

Gas flow through the patient unit

Inspiratory flow

1. Gas inlet for air. The connected air musthave a pressure between 200 and 650kPa (2 and 6.5 bar).

2. Gas inlet for O2. The connected O

2 must

have a pressure between 200 and 650kPa (2 and 6.5 bar).

3. The flow of the gas delivered to thepatient system is regulated by theinspiratory valves. There is one inspira-tory valve unit (gas module) for eachgas. The inspiratory valves are regulatedby a feedback control system that isdescribed in this chapter.

4. The gases are mixed in the inspiratorymixing part.

5. The pressure of the mixed gas deliveredto the patient (inspiratory pressure) ismeasured by the inspiratory pressuretransducer. The transducer is protectedby a bacteria filter.

6. The inspiratory pipe leads the mixed gasfrom the inspiratory mixing part to thepatient system. The inspiratory pipe alsocontains the safety valve, a holder for theO

2 cell and the inspiratory outlet. The

springloaded safety valve will open incase of a power failure and/or if the inspi-ratory pressure exceeds 120 cm H

2O. It

will also open if the set upper pressurelimit is exceeded by 5 cm H

2O.

7. The oxygen concentration inside theinspiratory pipe is measured by the O

2

cell. The O2 cell is protected by a

bacteria filter.

Expiratory flow

8. The patient system's expiratory gas tubeis connected at the expiratory inlet. Theexpiratory inlet also contains a moisturetrap.

9. The gas flow through the expiratorychannel is measured by the expiratoryflow transducer. Patient trigger efforts,indicated by a decreased continuousflow, are sensed by this expiratory flowtransducer.

10. The expiratory pressure is measured bythe expiratory pressure transducer. Thetransducer is protected by a bacteriafilter. Patient trigger efforts, indicated bya pressure drop, are sensed by thisexpiratory pressure transducer.

11. The pressure of the gas (PEEP pressure)in the patient system is regulated by theexpiratory valve. The expiratory valve isregulated by a feedback control systemthat is described in this chapter.

12. The gas from the patient system leavesthe ventilator via this expiratory outlet.The outlet contains a non-return valvewhich is a part of the patient triggeringsystem.



1

Feedback control system – General

Any CONTROLLING SYSTEM may comprise onesingle CONTROLLER or, for instance, a cascadeof more than one CONTROLLER. Compensatingelements may also be added.

CONTROLLER symbol used inthis chapter.

In each CONTROLLER, the actual value normallyfrom a TRANSDUCER in the CONTROLLED SYSTEM iscompared to the desired value = REFERENCEVARIABLE. The difference between these twoinput values results at the output of thecontrolling system in an ACTUATING SIGNAL.

Each CONTROLLER may comprise somecombination of the following parts:

• Proportional action, P

• Integral action, I

• Derivative action, D.

P-action gives a continuous basic positioning.

I-action gives a slowly varying positioningcompensation for small long time deviation.

D-action gives a speed-up positioningreaction at (fast) changes.

The signals from these parts (from the partsused in the actual combination) are added.The sum is the total ERROR SIGNAL which maybe converted before use as an ACTUATINGSIGNAL.

Each CONTROLLING ELEMENT (in the ventilator:inspiratory valves and expiratory valve) ispositioned by the ACTUATING SIGNAL from itscontrolling system. Feedback control, whichis synonymous with regulation, results in thecontrolled valve being moved into such aposition that the ACTUAL VALUE is kept equal tothe DESIRED VALUE independently ofdisturbance variables like changes in theairway resistance or lung compliance.

P

D

I

CONTROLLINGELEMENT

"COMPENSATOR"

CONTROLLING SYSTEM

COMPARINGELEMENT

CONTROLLED SYSTEMTRANSDUCER

ACTUALVALUE

ACTUATINGSIGNAL

REFERENCEVARIABLE

DESIREDVALUE

"ERRORCALCULATOR"

ERRORSIGNAL

CONVERTER

PID-CONTROLLER300-A08E

SIGNAL AMPLIFIER (WITH SERVO)



1

Inspiratory feedback control system

The inspiratory feedback control systemuses cascade control with a number ofcontrollers and compensating elements.

Flow regulation

Inspiratory flow regulation occurs duringinspiration time in the modes VolumeControl and SIMV (Vol. Contr.) and duringexpiration time in all modes.

When flow regulation is used, theshadowed main forward path comprises thefollowing:

• The microprocessor module in the blockMODE CPU in the main block REFERENCE &TIMING generates a FLOW REF. signal.

• The block MIXER, in the main blockINSPIRATORY CONTROL, splits the FLOW REF.signal into one GAS FLOW REF. signal for eachinspiratory valve (AIR FLOW REF. and O

2 FLOW

REF.). Each GAS FLOW REF. signal is used(after a minor correction within ±5 %) asDESIRED GAS FLOW VALUE (reference variable).

• ACTUAL GAS FLOW VALUE is generated bysignal converters (FLOW) using signals frommeasuring TRANSDUCERS.

• The actuating signal from the FLOW PICONTROL results in the DESIRED POSITION VALUE(reference variable) for the POSITION PDCONTROL. The POSITION SENSOR at theINSPIRATORY VALVE generates a valve positionsignal which is used as the ACTUAL POSITIONVALUE in the POSITION PD CONTROL.

• The actuating signal from the POSITION PDCONTROL results in the DESIRED CURRENT VALUE(reference variable) for the CURRENT CONTROL& CURRENT POWER.

• The ACTUAL CURRENT VALUE is an internalfeedback signal used in the CURRENTCONTROL block.

• The actuating signal from the output stageof the CURRENT CONTROL & CURRENT POWER is avoltage pulse train with pulse widthmodulation used to actuate the INSPIRATORYVALVE SOLENOID which generates a certainopening of the INSPIRATORY VALVE.

Flowregulation

POSITIONSENSOR

INSPIRATORYVALVE

CONTROLLED SYSTEM

VALVESOLENOID

PRESSURE

TRANSDUCERS

FLOW

ACTUAL CURRENT VALUEACTUAL POSITION VALUE

ACTUALSUPPLYPRESS.VALUE

GASFLOW

VALVE POSITIONCALCULATOR

REFERENCE& TIMING

DESIREDPOSITIONVALUE

CURRENTCONTROL &CURRENT

POWER

POSITION PDCONTROL

FLOW PICONTROL

DESIREDCURRENTVALUE

GASFLOWREF.MIXER

DESIREDGAS FLOWVALUE

ACTUALGAS FLOWVALUE

INSP. VALVE POSITIONFLOWREF.

GASSUPPLYPRESS.

FLOW CONTROL

300-

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INSPIRATORYCONTROL



1

In addition to the main forward path,compensating elements are added asdescribed in both inspiratory feedbackcontrol system pictures. The compensatingelements in this system works as follows:

• Using the input information of ACTUALSUPPLY PRESSURE VALUE and DESIRED GAS FLOWVALUE the VALVE POSITION CALCULATOR directlygenerates a rough approximate POSITIONVALUE which helps to obtain the desiredposition within minimum time.

• The input information of ACTUAL SUPPLYPRESSURE VALUE is used (inverted andadequatly scaled) to create one small partof the DESIRED CURRENT VALUE. This small partof the DESIRED CURRENT VALUE will – incombination with the opening force of theINSPIRATORY VALVE implied by the pressure ofthe supplied gas – help to balance theclosing force on the INSPIRATORY VALVEimplied by the mechanical spring insidethe VALVE SOLENOID even in closed positionof the INSPIRATORY VALVE.



1

Inspiratory feedback control system (cont'd)

• ACTUAL VALUE is the INSP. PRESSURE signalfrom the INSPIRATORY PRESSURE TRANSDUCER

• The actuating signal from the PRESSURE PIDCONTROL block is used as a FLOW REFERENCEsignal going to the MIXER.

The rest of the controlling system, includingcompensating elements, is the same as inflow regulation.

Pressure regulation

Inspiratory pressure regulation is used onlyduring inspiration time in all modes exceptwhen flow regulation is used as mentionedpreviously.

When PRESSURE regulation is used, theshadowed main forward path includes thePRESSURE PID CONTROL block in the REFERENCE &TIMING main block:

• DESIRED VALUE is the PRESSURE REFERENCEsignal from (the microprocessor moduleMODE CPU within) the main block REFERENCE& TIMING

Pressureregulation

DESIRED PRESS.VALUE

ACTUAL PRESS. VALUEPOSITIONSENSOR

INSPIRATORYVALVECONTROLLED SYSTEM

VALVESOLENOIDPRESSURE

TRANSDUCERS

FLOW

ACTUAL CURRENT VALUE

FLOW CONTROL

INSP. VALVE POSITIONACTUALSUPPLYPRESS.VALUE

GASFLOW

VALVE POSITIONCALCULATOR

REFERENCE& TIMING

PRESS.PID

CONTR.

FLOWREF.

MIXER


CURRENTCONTROL &CURRENT

POWER

POSITION PDCONTROL

FLOW PICONTROL

DESIREDCURRENTVALUE

ACTUAL POSITION VALUE

GASFLOWREF.

ACTUALGAS FLOWVALUE

DESIREDGAS FLOWVALUE

GASSUPPLYPRESS.

INSP. PRESSURE

300-

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PRESSURE REF.

INSPIRATORYCONTROL



1

Notes



1

Expiratory feedback control system

17

The expiratory feedback control systemuses cascade control. It is active only duringexpiration time in all modes. It appliesPRESSURE regulation.

• DESIRED VALUE is the PEEP LEVEL signal fromthe PANEL SECTION (according to front panelsetting)

• ACTUAL VALUE is the EXP. PRESSURE signalfrom the expiratory PRESSURE TRANSDUCER.

• The actuating signal from the PEEP PIDCONTROL block is the POSITION REF. signalused as DESIRED VALUE for the POSITION PDCONTROL.

• ACTUAL VALUE is the EXP. VALVE POSITION signalfrom the POSITION SENSOR in the EXPIRATORYVALVE.

• The actuating signal from the POSITION PDCONTROL block is the EXP. VALVE CURRENT REF.signal used as DESIRED VALUE for the CURRENTCONTROL & CURRENT POWER block.

• The ACTUAL CURRENT VALUE is an internalfeedback signal used in the CURRENTCONTROL block.

• The actuating signal from the output stageof the CURRENT CONTROL & CURRENT POWER is apulse train with pulse width modulationused to actuate the EXPIRATORY VALVESOLENOID which generates a certainopening of the EXPIRATORY VALVE.

POSITIONSENSOR

EXPIRATORY VALVE

CONTROLLED SYSTEM

VALVESOLENOID

PRESSURE

TRANSDUCER

PEEP PIDCONTROL

CURRENTCONTROL

&CURRENTPOWER

POSITION PDCONTROL

DESIRED EXPIRATORYPRESSURE VALUE

EXP. VALVECURRENT REF.

PRESSURE CONTROL

ACTUAL POSITION VALUE

POSITIONREF.

ACTUALEXPIRATORYPRESSUREVALUE

PEEP LEVEL

EXP. VALVE POSITION

ACTUAL CURRENT VALUE

DESIREDCURRENTVALUE


EXP.PRESSURE

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Principle diagram

M

+5V

±15V

+24V

O2

LM

V

M

C

M

PC

T

T I

M

M

O

M

A

W

X

P

G

H

11

9

8

7

6

54

3

21

10

12

TRANS-DUCERS

TRANS-DUCERS

TOPATIENT

INSP. PRESSURE

POWER SUPPLY INTERNALBATTERY

EXT. BATTERY

MAINS POWER

AIR

O2 CONC.AMPLIFIER

PRESSURECONTROL

FROMPATIENT

EXP.FLOW

VALVE CONTROLEXPIRATORYVALVE

O2 CONC.

PATIENT UNIT

O2 FLOW REF.

CONTROL UNIT

PRESSUREPID CONTROL

Pressure

INSPIRATORY CONTROL

MODE CPU

Flow

SELECTION OFPRESSURE ORFLOW REGULATION

PRESSURE REF.

FLOW REF.

FLOW REF.

INSP. PRESSURE

COMPUTER INTERFACE

INPUT SIGNALS

INPUT SIGNALS

INPUT FROMSV 300 INTERNAL

MICROPROCESSORS

EXTERNALCONTROLSIGNALS

EXTERNALOUTPUTSIGNALS

CONTROLSIGNALS

MONITORING

REFERENCE & TIMING

MIXER

O2 FLOW REF.

AIR FLOW REF.

PEEP LEVEL

O2CELL FLOW

CONTROL

INSPIRATORY VALVE UNIT - O2

FLOWCONTROL AIR FLOW REF.

INSPIRATORY VALVE UNIT - AIR

PRESSUREAMPLIFIER

PRESSUREAMPLIFIER

EXP. PRESSURE

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1

Inspiratory regulation

1. Choice between pressure regulation andflow regulation during inspiration ismade by the MODE CPU dependent on theMode selection.

2. Main parameters used for the flow levelduring inspiration when flow regulationis used.

3. Main parameters used for the pressurelevel during inspiration when pressureregulation is used.

4. Inspiration rise time setting determinesthe initial inspiration pattern. A succes-sively increased flow/pressure level maybe more comfortable for the patient.

5. The O2 concentration delivered to the

patient depends on the setting of theseO

2 concentration control knobs.

6. INSPIRATORY VALVE UNIT– AIR.The control system is described insection "Inspiratory feedback controlsystem" in this chapter.

7. INSPIRATORY VALVE UNIT– O2.

The control system is described insection "Inspiratory feedback controlsystem" in this chapter.

Expiratory regulation

8. PEEP level setting is used as DESIREDEXPIRATORY PRESSURE VALUE. See section"Expiratory feedback control system" inthis chapter.

9. EXPIRATORY VALVE interacts with the VALVECONTROL board as described in section"Expiratory feedback control system" inthis chapter.

Monitoring

10. The MONITORING board monitors andgenerates certain displayed parameters.It also activates alarm functions.

Computer interface

11. The optional COMPUTER INTERFACE board isused as input/output signal interface andincludes functions for computercommunication (RS-232). The PC boardis equipped with the followingconnectors:

– Master/Slave connection (N80)

– Analog I/O terminal (N81)

– Serial communication ports (N82/N83)

– Analog input & Digital code port (N84).

Power supply

12. The POWER SUPPLY board controls anddistributes power to the different partsof the ventilator. The power source canbe:

– Mains power

– External battery

– Internal battery.

19



1

Notes

Servo Ventilator 300/300A Description of functions


2

2. Description of functionsGeneral .................................................... 22

Microprocessor module PC 1588 ............ 23

Version labels .......................................... 24

Control unit – Panel section ..................... 25

1 Front panel ....................................... 25

1A Automode front panel ...................... 27

2 Panel interface.................................. 28

2A Automode panel interface ................ 29

Control unit – Control section .................. 30

3 Computer interface .......................... 30

3A Computer interface dummy ............. 33

4 Monitoring ........................................ 34

5 Optional PC board slot ...................... 48

6 Reference & Timing ......................... 49

7 Inspiratory control ............................. 61

Patient unit – Pneumatic section ............. 62

8 Inspiratory valve unit – Air ................ 62

9 Inspiratory valve unit – O2 . ............... 67

10 Inspiratory valve unit – Optional ....... 67

11 Inspiratory channel ........................... 68

12 Inspiratory pressure .......................... 70

13 Expiratory pressure .......................... 71

14 Expiratory channel ............................ 71

15 Valve control ..................................... 73

16 Expiratory valve ................................ 74

17 Optional interface ............................. 74

18 Expiratory flow linearization .............. 75

19 Cooling system ................................ 76

Patient unit – Power section .................... 76

20 Mains power .................................... 76

21 Power supply ................................... 77

22 Operating power .............................. 79

23 Interconnection cable ....................... 80


Description of functions Servo Ventilator 300/300A

2

General

As described in chapter Introduction, theServo Ventilator 300 can be divided into twoMain units; Control unit and Patient unit. Thetwo main units are connected to each otherwith the Interconnection cable.

For the purpose to describe all differentfunctions in the Servo Ventilator 300, thetwo main units are further divided asfollows:

Main unit

Section

Main block

Functional block

Example:

Control unit

Panel section

1 Front panel

1.1 Patient range selection

1.2 Airway pressure

etc.

2 Panel interface

2.1 Panel CPU including PAN-PROMfunctions

2.2 Parameter buffers

etc.

Functional descriptions of the Main blocksand Functional blocks can be found in thischapter. This functional description is basedon and refers to the Functional block diagramthat can be found as a fold out on the rearcover.

In this Description of functions, the wordsinspiratory and expiratory are used in thefirst place to indicate the site of a part (e gINSPIRATORY CHANNEL).

The words inspiration and expiration areused in the first place to indicate thecorresponding time interval duringventilation (e g INSPIRATION TIME)



2

Microprocessor modulePC 1588

A MICROPROCESSOR MODULE, PC1588 (1), isincluded on each one of the following fivePC boards:

• PC 1605 – REFERENCE & TIMING

• PC 1608 – MONITORING

• PC 1614 – PANEL INTERFACE

• PC 1615 – EXP. FLOW LINEARIZATION

• PC 1616 – INSPIRATORY CONTROL.

PC 1588 is mounted with its two rows ofconnectors (P65 and P66) into thecorresponding connectors (HYB1) on theabove mentioned PC boards.

PC 1588 is a programmable digital controlblock including:

• Microprocessor

• Analog – digital conversion

• Digital – analog conversion

• Digital I/O.

PC 1588 includes a green/red WATCHDOG LEDD1 (3). The LED indications are as follows:

– Green LED: Microprocessor program isrunning.

– Red LED: Program error indication.

– LED not lit: Microprocessor program notrunning.

PC 1588 also includes an exchangableprogram memory, PROM (2). The functionof PC 1588 depends on this PROM which isdifferent on the five different enumeratedboards. The PROM functions are mentionedin the description of the following blocks:

• 2.1 Panel CPU (PAN-PROM)

• 4.1 Monitor/Alarm CPU (MON-PROM)

• 6.1 Mode CPU (REF-PROM)

• 7.1 Mixer CPU (MIX-PROM)

• 18.1 Linearizing CPU (LIN-PROM)

Note – The MICROPROCESSOR -block onPC 1587 – COMPUTER INTERFACE, includes twoPROM modules (COM-PROM).PC 1588 is not used on PC 1587.

xxxxxx

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2

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PC 1608MON-PROM V6.0X

XX XX XXX E380EVERSION

SV 300

Operating Manual

8.x

XX XX XXX E313E

1

2

3

Version labels

A label (1) showing all PROM-versionsincluded in the ventilator is attached to thecontrol section. When replacing a PROM,attach the new label (2) that is delivered withthe new PROM onto the old label on thecontrol section.

Changing PROM-versions in the ventilator isused to add or change functions in theventilator. For that reason, it may also benecessary to replace the Operating Manualin connection with PROM replacements.The Operating Manual, valid for thecombination of PROMs used in theventilator, is identified with a versionnumber stated both on the manual and onthe label (3). When replacing the OperatingManual with a new version of the manual,attach the new label (3) that is delivered withthe new Operating Manual onto the old labelon the control section.



2

Control unit – Panel section

The Panel section consists of the mainblocks 1 – 2 which are described below.

1 Front panel

This main block contains the front panelfilm, in different language versions, and thevarious displays and controls withconnection cables and their connectors.

The optional front panel function for SV 300Ais described in section 1A AUTOMODE that canbe found after 1.8 MODE SELECTION.

1.1 Patient range selection

For selection of one of three availablepatient ranges:

• 1 three-position selector. This switchgenerates selection information from twoswitch decks delivering one two bit codeand corresponding two bit complementarycode.

• 3 yellow indicator LEDs.

The following table indicates how Patientrange selection affects some otherparameters:

retemaraP tludA cirtaideP etanoeN tinU

emityaled–mralaaenpA 02 51 01 s

gnirudwolftnatsnoC=”wolfsaiB”emitnoitaripxe

232

611

85.0

s/lmnim/l

wolfyrotaripsni.xaM0003081

00503

00221

s/lmnim/l

royrotaripsni)derusaemroteserp(.xaMemulovladityrotaripxe

9993 993 93 lm

FERWOLF timilegnarrevo 3.3 55.0 22.0 s/l

:mralaemulovetunimyrotaripxEtimilmralareppUrofegnargnitteStimilmralarewoLrofegnargnitteS

mrala)latigid(lamronrofeulavtsewoL*mralapukcabrofeulavtsewoL*

06-004-*

3.02.0

06-004-*

3.02.0

6-004-*

60.050.0

nim/lnim/lnim/lnim/l

tsalecnisnoitarudemiT:edomotuAroFtroppuS/lortnoCnehwreggirttneitap

otedomtroppuSmorfsehctiwsedom.edomlortnoC

21 8 5 s



2

1.3 Respiratory pattern

For control and/or monitoring of respiratorypattern parameters:

• 4 four-character LED displays

• 5 potentiometer knobs:

– CMV freq. b/min. This control isequipped with two parallellpotentiometers – one for the controlfunction and the other for the monitor/alarm function.

– Insp. time %. Push button releasefunction for two-way mechanical stopsat approx. 20, 50 and 70%.

– Pause time %. Push button releasefunction for one-way mechanical stop atapprox. 20%.

– Insp. rise time %. Push button releasefunction for one-way mechanical stop atapprox. 1%.

– SIMV freq. b/min.


1.4 Volume

For control and/or monitoring of minutevolume and tidal volume parameters:

• 2 four-character green LED displays.Showing information generated via2.1 PANEL CPU.

• 3 four-character red LED displays.Showing information generated via 4.1MONITOR/ALARM CPU.

• 2 fields of double column LED bargraph.


– Volume

– Upper alarm limit

– Lower alarm limit.


1.2 Airway pressure

For control and monitoring of AIRWAYPRESSURE parameters:

• 4 four-character LED displays.

• 1 double column LED bargraph.


– Upper press. limit. Push button releasefunction for one-way mechanical stopsat approx. 60, 80 and 100 cm H

2O.

– Pressure Control Level above PEEP.Push button release function for one-way mechanical stops at approx. 30, 60and 80 cm H

2O.

– Pressure Support Level above PEEP.Push button release function for one-way mechanical stops at approx. 30, 60and 80 cm H

2O.

– PEEP. Push button release function forone-way mechanical stop at approx.20 cm H

2O.

– Trigg. sensitivity Level below PEEP.




2

1.5 O2 concentration

For control and monitoring of O2

concentration parameters:

• 1 four-character LED display. Showinginformation generated via 2.1 PANEL CPU.

• 1 potentiometer knob with push buttonrelease function for two-way mechanicalstop at approx. 60 %. This control isequipped with two parallell potentiometers– one for the regulation function and theother for the monitor/alarm function.

• 1 non-locking, two-way selector forOxygen breaths and for Start breath.


1.6 Alarms and messages

For the display of alarms and messages:

• 1 eight-character LED display. Showinginformation generated via 4.1 MONITOR/ALARM CPU.

• 8 different alarm fields each comprising:

– 1 red indicator LED

– 1 yellow indicator LED

– 1 touch sensor

• 1 non-locking, two-way selector for Resetand for 2 min off. This information ishandled by the main block 4 MONITORING.

1.7 Pause hold

For the control, via main block 6 REFERENCE &TIMING, of pause hold functions:

• 1 non-locking two-way selector for Insp.pause hold and for Exp. pause hold.

1.8 Mode selection

For the selection of Ventilation Modes andcontrol of the Set Parameter Guidefunctions:

• 1 green Mains indicator LED

• 1 ten-position selector always suppliedwith high impedance 24 V. This switchgenerates selection information from twoswitch decks delivering complementarycode via PC board (PC 1632). The modeOptional can not be selected.

• 10 different fields each comprising:

– 1 yellow indicator LED

– 1 touch sensor.

1A Automode front panel

For the control and monitoring of theAutomode functions:

• 1 two-position selector for turning theAutomode On and Off




2

2.3 Inputs

Analog multiplexor for input signals to theblock 2.1 PANEL CPU.

2.4 LED matrix

Time multiplexed addressing and drivingstages for the block 2.5 LED ARRAY. The inputdata is given from the block 2.1 PANEL CPU.

2.5 LED array

This block contains the light emitting diodesof the front panel bargraphs and the yellowlight emitting diodes at the front panelsettings.

Some flashing function in front panelbargraphs are mentioned in 4.1 MONITOR/ALARM CPU

2.6 Panel display

This block contains all the green alpha-numerical four character light emitting diodedisplays on the front panel. The input data isgiven from the block 2.1 PANEL CPU.

2.7 Mode select

Input stage for the signals from the frontpanel Mode selector. The input is availableas four bit code and corresponding four bitcomplementary code generated via thesmall interconnecting circuit board PC 1632on the Mode selector. This block gives thedata to the block 2.1 PANEL CPU.

2 Panel interface

This main block consists of the boardPC 1614 PANEL INTERFACE including itsPC1588 MICROPROCESSOR MODULE . The boardis connected (via N18, N19 and N40) to themother board (PC 1617) CONTROL INTERCONNEC-TION and it has connectors (P81 – P99) forthe connection of FRONT PANEL controls.

The FRONT PANEL touch sensors as well asdisplays and indicator LEDs are integratedparts of this board. Refer to 1 FRONT PANEL inthis chapter.

A connector, N20 (on some older PC-boards,the connector is marked N80), is providedon the board for additional function. Thisconnector can be used to connect theoptional PC 1745 AUTOMODE PANEL INTERFACEused in SV 300A. This function is describedin section 2A AUTOMODE PANEL INTERFACE thatcan be found after 2.9 MONITOR DISPLAY.

.

2.1 Panel CPU including PAN-PROM functions

This block includes the board PC 1588 witha PAN-PROM. Some details of the PC 1588 arementioned in section Microprocessormodule PC 1588 in this chapter.

The PAN-PROM function includes the handlingof input signals from the main block 1 FRONTPANEL, calculation of some displayed valuesand handling of signals to the displays onthe main block 1 FRONT PANEL.

2.2 Parameter buffers

Input stage for potentiometers on the mainblock 1 FRONT PANEL.



2

2.8 Opto switch

Time multiplexed driving stage and sensorreceiving stage for all the infra-red sensortouch pads on the front panel. The functionis controlled by the block 2.1 PANEL CPUincluding an automatic adaption of the touchpad sensitivity to the ambient light level.This block gives the data to the block 2.1PANEL CPU.

2.9 Monitor display

This block contains all the red alpha-numerical four character light emitting diodedisplays as well as eight yellow and eightred alarm indicating light emitting diodesbelow the Alarms and messages display onthe front panel. This block is driven directlyfrom the main block 4 MONITORING.

2A Automode panelinterface

The board PC 1745 AUTOMODE PANEL INTERFACEcontains electronics for handling of theAutomode switch.

The status of the switch is given to theblocks 2.1 PANEL CPU, 5 MONITORING and6 REFERENCE & TIMING. The LEDs are drivenfrom the main block 4 MONITORING.



2

Control unit – Control section

The Control section consists of the mainblocks 3 – 7 which are described below.

A ”mother” board, PC 1617 CONTROLINTERCONNECTION, provides signal connectionsvia connectors (but no electronic functions).

3 Computer interface

The ventilator can be equipped with theboard PC 1587 COMPUTER INTERFACE to providethe interface functions described below.

If these interface functions are not needed,the board PC 1665 COMPUTER INTERFACE DUMMYcan be mounted instead of PC 1587.The PC 1665-function is described in section3A COMPUTER INTERFACE DUMMY that can befound after section 3.9 LED INDICATORS.

The board PC 1587 COMPUTER INTERFACE wasreplaced during the mandatory upgrades:

– SV 300, Upgrade 1995-09 (US market)

– SV 300, Upgrade 1995-10 (Rest of World)

As the board PC 1587D was included inthese mandatory upgrades, all SV 300/300Amust be equipped with PC 1587D (or higher).

The main block COMPUTER INTERFACE consistsof the board PC 1587 COMPUTER INTERFACEwhich includes one microprocessor and aCOM-PROM. The COM-PROM is divided in twoPROM modules

There are five connectors (N80 – N84) onPC 1587.

Only accessories, supplies or auxiliaryequipment listed in Siemens-Elema catalogs(”Products and accessories” Order No.90 34 562 E323E and ”Spare and exchangeparts” Order No. 90 34 570 E323E) must beconnected to or used in conjunction with theventilator.Warning: Use of accessories and auxiliaryequipment other than those specified inthese catalogs may degrade safety andperformance of the ventilator.

N80

N81N82

N83

N84

300-A15X



2

3.1 Microprocessor CPUincluding COM-PROM functions

This includes functions for computercommunication (RS-232) via 3.7 SERIALCOMMUNICATION PORTS as described in theReference Manual "Servo Ventilator 300/300A, Computer Interface (Firmware version2.X)", Order No. 63 14 061.

This block also contains a real time clockwith battery backup, driven by a quartzcrystal of 32768 Hz. The purpose of thisclock is to time stamp the trend valuesstored in the ventilator. There is also apossibility to read the actual time throughthe RS-232 communication.

3.2 I/O buffers

Analog and digital input and output stagesfor the main block 3 COMPUTER INTERFACE.

3.3 A/D, D/A

Analog to digital and digital to analogconversion in connection with the block3.1 MICROPROCESSOR CPU.

3.4 Battery

On board mounted Lithium battery (3.5 V).The battery backs up the trend data memoryand the real time clock in the block3.1 MICROPROCESSOR CPU when the SV 300 isswitched off.

Normal service interval for exchange of thebattery is approx. 5 years. Replacement ofthe battery is described in chapter”4. Service procedures”.

The voltage level in the battery circuit ismonitored resulting in an error indication onLED D3 (see 3.9 LED indicators) if thevoltage level is below 3.6 V or above 4.5 V.An information message is also displayed onServo Screen 390 if such unit is connectedto the SV 300.Note – The voltage level measured in thebattery circuit is higher than the voltage levelin the battery itself.

3.5 Master/Slave connection

15 pole D-sub connector (N80). Can be usedfor the synchronization of two ServoVentilator 300. Only Siemens connectioncable must be used.

Pin configuration and signal names can befound in chapter "8. Diagrams".

3.6 Analog I/O terminal

62 pole D-sub connector (N81). Can be usedfor connection of monitoring/recordingequipment.

Input control signals can be connected atN81 to control some ventilator functions(e.g. when using Bi-Phasic Ventilation).These input signals are routed via twosockets, J2 and J3, on PC 1587.To enable the control functions, jumpersmust be mounted in the sockets.

Pin configuration, signal names and jumperscan be found in chapter "8. Diagrams".



2

3.7 Serial communication ports

26 pole D-sub connectors (N82 and N83) forRS-232-C data communication. For com-munication protocol, see Reference Manual"Servo Ventilator 300/300A, ComputerInterface (Firmware version 2.X)", Order No.63 14 061 E380E.

The connectors are identical with oneexception; the internal clock can only be setvia N82.

Serial communication is indicated on theLEDs D6 – D9. See 3.9 LED INDICATORS.


3.8 Analog input & Digital codeport

44 pole D-sub connector (N84). Optionalinput interface.


300-

L24X

D1D9

3.9 LED indicators

There are 9 green/red LED INDICATORSmounted on PC 1587. The LEDs are visibleif the control section cover is removed.

LED functions

D1: WATCHDOG. During startup the LED willflash for a short moment and then be lit redfor a short moment. It will then be lit greenagain.

When the startup test is completed, theLED indications are as follows:

– Green LED: Microprocessor program isrunning.

– Red LED: Program error indication.

– LED not lit: Microprocessor program notrunning.



2

3A Computer interfacedummy

The PC 1665 COMPUTER INTERFACE DUMMY ismounted instead of PC 1587 COMPUTERINTERFACE, in the case that there is no needfor serial communication with the ventilator.

It is needed as a holder for the PC 1608, aswell as for disabling the error signal from theCOMPUTER INTERFACE board and the signals forMaster – Slave.

D2 – D5: TEST STATUS LED. Error indicationsduring System startup test. The startup testis divided in several sequences.

The first sequence is a LED test that startswith all LEDs red. The LEDs will thenchange to green, one at the time (startingwith D2), until all four LEDs are green.

In the hardware test sequence, D3 can be ofspecial interest for troubleshooting.In the first phase of the hardware test, D3 islit red for a few seconds indicating COM-PROMerror. In the second phase of the hardwaretest, D3 is lit red for a few secondsindicating BATTERY error.

The hardware test sequence ends showingall LEDs green if no error was detected andall LEDs red if any error was detected.

Note – As COM-PROM and BATTERY are the onlyspare parts for PC 1587, any other LED errorindications than mentioned above results ina PC 1587 replacement.

D6 – D7: SERIAL INTERFACE 1. Rapidly flashinggreen and red indicates communication onconnector N82. D6 indicates input and D7indicates output.

D8 – D9: SERIAL INTERFACE 1. Rapidly flashinggreen and red indicates communication onconnector N83. D8 indicates input and D9indicates output.



2

4 Monitoring

This main block consists of the boardPC 1608 MONITORING including its PC 1588MICROPROCESSOR MODULE and the4.7 LOUDSPEAKER.

New versions of PC 1608 MONITORING andMON-PROM was introduced in productionduring 1996 and also as an optional upgradeon delivered units. The upgrade was called”SV 300, ALARM SYSTEM ENHANCEMENT KIT 96-05”.The new versions was:

– PC 1608E

– MON-PROM V6.00

As the upgrade was optional and notmandatory, a number of not upgradedSV 300 are equipped with MON-PROM V5.01(and PC 1608A, -B, -C or -D). These unitsmust be equipped with a FAILURE ALARM BOX.Note – PC 1608E is backwards compatibleand can be equipped with MON-PROM V5.01.The FAILURE ALARM BOX must be used also onthese units.

The alarm functions of the FAILURE ALARM BOXare integrated on MON-PROM V6.00/PC 1608Eand the FAILURE ALARM BOX is not used onSV 300 equipped with MON-PROM V6.00/PC 1608E (or higher).

For more information about PROM, PC boardand Operating Manual versions, see chapter”6. Product change history”.

4.1 Monitor/Alarm CPU includingMON-PROM functions

This block includes the board PC 1588 witha MON-PROM. Some details of the PC 1588are mentioned in section Microprocessormodule PC 1588 in this chapter. The MON-PROM functions include the (program control)digital monitoring of certain parameters andthe activation of alarm functions:

• Front panel indications via the block2.9 MONITOR DISPLAY

• Audible indications via the block4.3 SOUND & ALARM CONTROL.

In the following description (4.1.1 – 4.1.8)alarms are mentioned in groups, each groupassociated with corresponding Alarm fieldwithin the Front panel field ”Alarms andMessages”.

For each Alarm field this description of thenormal (digital control) alarm contains:

• Alarms and Messages - Alarm fieldname

• Parameter monitored for alarm, PMA

and corresponding Reference value

• Alarm tablecontaining conditions for alarm.



2

4.1.1 Airway pressure

PMA: PI = INSP. PRESSURE; signal from main block 12 INSPIRATORY PRESSURE.

PE = EXP. PRESSURE; signal from main block 13 EXPIRATORY PRESSURE.

LIM_PRESS.L = Signal from the block 6.1 MODE CPU including REF-PROM functions.

Reference value Pmax

= Preset Upper pressure limit (on Front panel).

Reference value PEEP = Preset PEEP Level (on Front panel).

Alarm table:

”segassemdnasmralA” noitidnocmralA krameR

hgihooterusserpyawriA 2 PI P> xam ro

PE P> xam

noitidnoceurttA 1

detibihnisiNOITARIPSNI.detratssiNOITARIPXEdna

erusserpsuounitnochgiH PI Hmc51+PEEP> 2O ro

PE Hmc51+PEEP> 2O

ehtfoynafimralAeurtsniamersnoitidnoc

.s51gnirud

erusserpdetimiL ,evitca=L.SSERP_MIL:noitidnocotsdnopserroc(

P FER P= xam Hmc5– 2Odna etuniM/ladiTgnitluser

sselsinoitalitnevemulov)gnitteslenaptnorfnaht

langisL.SSERP_MIL 3 ylnoSVroCVRPgniruddesu

ehtfimralA.edomnoitidnocmraladenoitnem

eerhtgnirudeurtsi.shtaerbevitucesnoc

1 Refer to 6.1.2 Respiratory timing - condition (3).2 Identical condition is also monitored separately within the main block 2. Panel interface

and that is used for the following function: At true condition the Airway pressure bargraphindication for Upper pressure limit is flashing.

3 Refer to 6.1.1 Reference generation - PRVC and VS mode.

Monitoring also controls the following opening and closing of the Safety valve:

When opened the Safety valve will stay open until following conditions are true:

For Airway pressure alarm also see 4.5 Backup alarm system.

noitidnocerP noitidnocgnisolC

gnirudtsaeltaneposyatsevlavytefaS.sm004

PI P< xam Hmc5+ 2O dnaPE P< xam Hmc5+ 2O

noitidnocgninepO krameR

PI P> xam Hmc6+ 2O roPE P> xam Hmc6+ 2O

ybdesuacsawgninepoehtfI.snepoevlavytefaSehTmetsysmralapukcaBehtsnoitidnocesehtfoyna

.mralaelbiduasuounitnocsetareneg



2

4.1.2 O2 concentration

PMA: O2 concentration = Signal generated within the block 4.1 using O

2 CONC. signal from

the block 11.3 O2 CELL which is digitally compensated for mean airway pressure and

barometric pressure according to BAROMETER PRESSURE signal from 4.6 BAROMETERPRESSURE TRANSDUCER.

Reference value Set O2 = Preset O

2 concentration (on Front panel).

Alarm table:

If above mentioned O2 concentration alarm condition is true during less than 55 s the alarm

is not registered in the alarm memory.

If the O2 concentration setting is changed more than 2 percentage units, the alarm is

automatically muted for maximum 55 s. This also applies at activation of ”Oxygen breath”.

For O2 concentration alarm also see 4.5 Backup alarm system.

txet”segassemdnasmralA” noitidnocerP noitidnocmralA

hgihootcnoc2O OteS<%12 2 %001< OteS>AMP 2 %6+

wolootcnoc2O OteS<%12 2 %42<OteS<%42 2 %69<OteS<%69 2

%81<AMPOteS<AMP 2 %6–

%09<AMP

txet”segassemdnasmralA” noitcnuflanoitiddA

ROSNES2O OehtfI 2 mralaytiroirphgiH;detcennocsidsillec.langisnoituacaotdegnahcebnactaht

4.1.3 Optional alarm field

On earlier versions of the ventilator, the alarm field name was ”CO2 concentration”.

This optional alarm field is not used.



2

4.1.4 Exp. minute volume

PMA: Exp. min. vol. = signal from the block 4.4 FLOW FILTERS & INTEGRATORS.

Reference value Mmax

= Preset Upper alarm limit for Expired minute volume

Reference value Mmin

= {The highest of the following two possibilities:}

= Preset Lower alarm limit for Expired minute volume or

= Lowest value for normal (digital) alarm; value according to table in 1.1. Patient rangeselection.

Alarm table:

1 Identical condition is also monitored separately within the main block 2 PANEL INTERFACE andthat is used for the following function: At true condition the Minute volume bargraphindication for Upper alarm limit is flashing.

2 Identical condition is also monitored separately within main the block 2 PANEL INTERFACE andthat is used for the following function: At true condition the Airway pressure bargraphindication for Lower alarm limit is flashing.

For Exp. minute volume alarm also see 4.5 BACKUP ALARM SYSTEM.

txet”segassemdnasmralA” noitidnocmralA

hgihootemulovetunim.pxE M>AMP xam1

wolootemulovetunim.pxE M<AMP nim2

4.1.5 Apnea

PMA: The measured time durations TC corresponding to Breath cycle.

TC = Time duration measured from each Start Inspiration until next Start Inspiration.

Reference value Td = {Apnea alarm delay time}, Value according to table in block 1.1 PATIENT

RANGE SELECTION.

Alarm table:

If the Mode selector is in position VS and Apnea alarm is active the ventilator performsPRVC Mode. See 6.1.2. RESPIRATORY TIMING ”condition (A)”.

txet”segassemdnasmralA” noitidnocmralA krameR

MRALAAENPA TC T> d evitcasyatsmraladetavitcA.lenaptnorFnoteserlitnu



2

4.1.6 Gas supply

PMA: Measured gas supply pressures

PAIR

= Air supply pressure

PO2

= Oxygen supply pressure

Alarm table:

1 The high priority alarm may be downgraded to a silent caution alarm if the set O2 concen-

tration is between 98 and 100%.

2 The high priority alarm may be downgraded to a silent caution alarm if the set O2 concen-

tration is between 21 and 23%.

3 In case of PAIR

or PO2

< 1.0 bar, the inspiratory flow is compensated for the missing flow bythe remaining gas.

4 In case of gas failure of both gases, the safety valve and the expiratory valve will open. Thealarm in this case:


wolooterusserpylppus2OwolooterusserpylppusriArabX.X:2OrabX.X:riA

P RIA rab0.2< dnaP 2O rab0.2<


rabX.X:2OrabX.X:riAhgihooterusserpylppusriA P RIA rab5.6>

rabX.X:2OrabX.X:riAhgihooterusserpylppus2O P 2O rab5.6>

rabX.X:2OrabX.X:riAwolooterusserpylppusriA P RIA rab0.2< 4&3&1

rabX.X:2OrabX.X:riAwolooterusserpylppus2O P 2O rab0.2< 4&3&2



2

4.1.7 Battery

PMA: Measured voltage levels. External power voltage level: The block 21.3 VOLTAGECONTROL & TIMING indicates, by the INTERNAL BATTERY MODE signal, in case the externalmain and external battery power voltages are both too low.

Ubat

= INTERNAL BATTERY VOLTAGE; signal from the block 21.5 BATTERY CHARGE CONTROL.

Alarm table:

txet”segassemdnasmralA” noitidnocerP

YRETTAB .gnihsalfnwohssiegassemsihT:etoN EDOMYRETTABLANRETNI)s5.3>gnirud(evitca=

txet”segassemdnasmralA” noitidnoC

VX.X:lanretnIhgihootegatlovyrettablanretnI U tab V5.33>

VX.X:lanretnItfelyticapacyrettabdetimiL U<V12 tab V32<

LAUNAMGNITAREPOEEStfelyticapacyrettaboN U<V5.91 tab V12<

noitidnocrehtruF krameR

U tab V5.91< .sevlavrotalitnevehtotdetubirtsidsiylppusrewopoN



2

4.1.8 Technical

PMA 1: Start up test results. Signals generated within the main block 4. MONITORING. The startuptest is made once each time the Mode selector is turned from the position Off.The start up test comprises the following parts:

– Power Failure Monitor hardware test. Concerns the function of the hardwarewhich is used as Power Failure Monitor for upper and lower alarm limits forinternal Supply Voltages. The function of this Power Failure Monitor hardware is toconstitute Alarm limit values for the different supply voltages as shown in Supplyvoltage, Alarm table in 4.5 BACKUP ALARM SYSTEM. The status of the backup capacitorfor this hardware is also checked (the capacitor is also checked regularly duringoperation).

– Internal RAM test; concerns the RAM within the block 4.1 MONITOR/ALARM CPU

– Internal ROM test; concerns the MON-PROM within the block 4.1 MONITOR/ALARM CPU

– Internal CPU test; concerns the CPU within the block 4.1 MONITOR/ALARM CPU

Alarm Table:

txet”segassemdnasmralA” noitidnocmralA:1AMP:morfnoitacidnirorrE

TRATSERTFPedocrorrelacinhceT tseteruliafrewoP

TRATSERMARedocrorrelacinhceT tsetMARlanretnI

TRATSERMORedocrorrelacinhceT tsetMORlanretnI

TRATSERUPCedocrorrelacinhceT tsetUPClanretnI



2

txet”segassemdnasmralA” noitidnocmralA:2AMPeruliafrossecorporciM

:morf)yldetaeper(langis

edocrorrelacinhceT µ /LAUNAMGNITAREPOEESnaPPTRATSER

ecafretnilenaP

edocrorrelacinhceT µ /LAUNAMGNITAREPOEESMCSPTRATSER

ecafretniretupmoC

edocrorrelacinhceT µ /LAUNAMGNITAREPOEEST&RPTRATSER

gnimiT&ecnerefeR

edocrorrelacinhceT µ /LAUNAMGNITAREPOEESxiMPTRATSER

lortnocyrotaripsnI

edocrorrelacinhceT µ /LAUNAMGNITAREPOEESpxEPTRATSER

.nilwolf.pxE

PMA 2: Microprocessor failure. Signals from each of the following blocks:

2.1 PANEL CPU (PC 1614 PANEL INTERFACE)

3.1 MICROPROCESSOR CPU (PC 1587 COMPUTER INTERFACE)

6.1 MODE CPU (PC 1605 REFERENCE & TIMING)

7.1 MIXER CPU (PC 1616 INSPIRATORY CONTROL)

18.1 LINEARIZING CPU (PC 1615 EXP. FLOW LIN.)

Alarm table:



2

PMA 3: Monitored front panel inputs. Signals from each of the following blocks:

1.1 PATIENT RANGE SELECTION (from Patient range selector)

1.3 RESPIRATORY PATTERN (from CMV freq. setting - double potentiometer)

1.5 O2 CONCENTRATION (from O

2 concentration setting - double potentiometer)

1.8 MODE SELECTION (from Mode selector via 2.8 Mode select - Input stage)

Alarm table:

txet”segassemdnasmralA” noitidnocmralA:3AMPecnereffidniatreC

-eb)yldetaeper(dedeecxelenaptnorFowtehtneewt:morfriapnignimocstupni

LAUNAMGNITAREPOEESRwSedocrorrelacinhceT hctiwsegnartneitaP

LAUNAMGNITAREPOEESMwSedocrorrelacinhceT rotcelesedoM

LAUNAMGNITAREPOEESCoPedocrorrelacinhceT gnittesycneuqerfVMC

LAUNAMGNITAREPOEESOoPedocrorrelacinhceT O2 gnittesnoitartnecnoc

PMA 4: PB. Barometer pressure (signal from 4.6 BAROMETER PRESSURE TRANSDUCER)

Alarm table:

txet”segassemdnasmralA” noitidnocmralA:4AMP

LAUNAMGNITAREPOEESaBedocrorrelacinhceT PB rabm007< roPB rabm0011>



2

PMA 5: Internal supply voltages. Failure signal from Power Failure Monitor hardware (part of theblock 4.5 BACKUP ALARM SYSTEM).

Reference values (alarm limits) according to 4.5 BACKUP ALARM SYSTEM.

Alarm table:

txet”segassemdnasmralA” noitidnocmralA:5AMP

LAUNAMGNITAREPOEESFPedocrorrelacinhceT langisehtfimralAREWOP _ ERULIAF .H yltnatsnocsi

nahteromgniruddetavitca.s1

PMA 6: PI = Insp. pressure, signal from main block 12 INSPIRATORY PRESSURE, and

PE = Exp. pressure, signal from main block 13 EXPIRATORY PRESSURE, are used to

generate:

P1 = the mean value of P

I during inspiration time


E during inspiration time


I during the first 80 ms of expiration time


E during the first 80 ms of expiration time


E during the last 32 ms of expiration time


E during the time period 40 - 80 ms from start exp. time

Reference value PEEP = Preset PEEP Level (on Front panel).

Alarm table:

txet”segassemdnasmralA” noitidnocmralA:6AMP krameR

SGNIBUTKCEHC P1 Hmc51> 2O dnaP2 Hmc4< 2O dnaP4 Hmc4< 2O dnaP5 P- 6 Hmc1< 2O dnaP3 Hmc21+PEEP> 2O

erasnoitidnoc5llafimralA.eurt

mralasihtnehwemithcaEevlavytefaseht,strats

.s5rofsnepo



2

PMA 7: OverrangeErr signal from 7.1 MIXER CPU,indicating high Ref. value for flow, and thefollowing Tidal Volume signals:

TVI = Tidal Volume output value from Insp. Flow Integrator (block 4.4 )

TVE = Tidal Volume output value from Exp. Flow Integrator (block 4.4 )

TVSET

= Tidal Volume value according to Front panel setting (corresp. to green display).

Alarm table:

txet”segassemdnasmralA” noitidnocmralA:7AMP:detcelesegnartneitaP etanoeN

krameR

CIRTAIDEPtceleS:EGNARREVO 1.7morfevitcalangisegnarrevOREXIM UPC eulav.feRhgihgnitacidni

.)F(wolFrofs/l22.0>F@ 1

VT I lm5.93> 2&1

VT E lm5.93> 3&1

VT TES lm0.43> 4

ynafimralAesehtfo

sisnoitidnoc.eurt 4

txet”segassemdnasmralA” noitidnocmralA:7AMP:detcelesegnartneitaP cirtaideP

krameR

TLUDAtceleS:EGNARREVO 1.7morfevitcalangisegnarrevOREXIM UPC eulav.feRhgihgnitacidni

.)F(wolFrofs/l55.0>F@ 1

VT I lm593> 2&1

VT E lm593> 3&1

VT TES lm043> 4

ynafimralAesehtfo

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1 The acoustical part of the alarm is delayed 10 s.

2 The Front panel red display Insp. tidal volume is flashing.

3 The Front panel red displays Exp. tidal volume and Exp. minute volume are flashing.

4 The condition concerning TVSET

is considered only during PRVC Mode



2

4.2 Inputs interface & A/D

Multiplexor and analog to digital conversionstages for input signals to the main block4 MONITORING.

4.3 Sound & Alarm control

Alarm control circuits including the drivingstage for the block 4.7 LOUDSPEAKER.

4.4 Flow filters & Integrators

The input signals AIR FLOW and O2 FLOW are

added to generate INSP. FLOW (block internalsignal INSP. FLOW SUM).

The difference between the signals INSP.FLOW SUM and EXP. FLOW generates the signalAIRWAY FLOW (= block internal signal EXP. FLOWINT.) as well as the signals INSP. FLOW PATIENTand EXP. FLOW PATIENT. This way of calculatingis necessary to achieve the last twomentioned signals of patient flow duringEXPIRATION TIME when a constant flow to thepatient system is generated via theinspiratory valve(valves).

Integration during each breath of the signalINSP. FLOW SUM generates INSP. TIDAL VOL. Thesignal INSP. FLOW PATIENT is averaged togenerate INSP. MIN. VOL.

Integration during each breath of the signalEXP. FLOW INT. generates EXP. TIDAL VOL. Thesignal EXP. FLOW PATIENT is averaged togenerate EXP. MIN. VOL.

Some of the signals are used for monitor/alarm within this main block, some of themused for mode regulation algorithms by theblock 6.1 MODE CPU and some of themdisplayed on the front panel. The signalsINSP. FLOW PATIENT and EXP. FLOW PATIENT areavailable at the 3.6 ANALOG I/O TERMINAL.

4.5 Backup alarm system

The internal power supply voltages aremonitored in this block. If any of the voltagelimits are exceeded, the supply voltage alarmis activated by the signal POWER_FAILURE.H.

The parameters AIRWAY PRESSURE (upper alarmlimit) and O

2CONC and EXP. MINUTE VOLUME are

monitored (analog monitoring) at somewhatwider alarm limits than the correspondingdigital monitoring function of the block 4.1MONITOR/ALARM CPU. This block activates analarm only if the regular (digital) alarmsystem is failing.

This block includes the driving stage for theblock 4.8 BEEPER.

Active backup alarm consists of intermittent(in some case continuos) audible alarmgenerated by means of the 4.8 BEEPER.

Preconditions for backup alarm: Alarmcondition mentioned below is fullfilled andnormal (digital control) alarm is not active. Inthis connection the normal alarm isconsidered not active also in case ofloudspeaker error (indicated via the Loud-speaker supervisor function connected tothe Sound generation function in the block4.3 SOUND & ALARM CONTROL).

Special condition leading to active Backupalarm is mentioned under 4.1 MONITOR/ALARMCPU.

The Backup alarm system contains thefollowing different PMA = Parameter Monitored

for Alarm. Each alarm table containsconditions for alarm.



2

4.5.1 Supply voltage

PMA = Internal supply voltages.

Reference values as shown in the following Alarm table.

Alarm table:

1 The signal POWER_FAILURE.H will activate functions to open the SAFETY VALVE and EXPIRATORYVALVE and close the INSPIRATORY VALVES.

2 If the +5 V alarm limit is exceeded; only the Backup alarm system, generating an inter-mittent audible alarm, is activated. ”Alarms and messages text” and/or flashing LEDs willnot be given on the front panel. All front panel LEDs, indications and displays, will beturned off.

If any of the +15 V, -15 V or +24 V alarm limits are exceeded; the normal (digital control)alarm (see 4.1.8 Technical, PMA 5) and the Backup alarm system, generating an inter-mittent audible alarm, are activated. ”Alarms and messages text” and/or flashing LEDswill be given on the front panel.

Restart the ventilator.

4.5.2 Airway pressure

PMA: PI = Insp. pressure; signal from main block 12 INSPIRATORY PRESSURE),

PE = Exp. pressure; signal from main block 13 EXPIRATORY PRESSURE).

Reference value Pmax

= Preset Upper pressure limit (on Front panel).

Alarm table:

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V5+V51+V51–V42+

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2

4.5.4 Exp. minute volume

PMA = Exp. minute volume; Signal from block 4.4 FLOW FILTERS & INTEGRATORS.

Mmax

= 1.1 x Preset Upper alarm limit for Expired minute volume

Mmin

= {The highest of the following two possibilities:}

= 0.9 x Preset Lower alarm limit for Expired minute volume or

= Lowest value used for backup alarm, see 1.1 PATIENT RANGE SELECTION.

Alarm table:

4.5.3 O2 concentration

PMA = O2 concentration; signal generated within the block 4.5 using O2_CONC. signal from

the block 11.3 O2 CELL which is analogically compensated for barometric pressure according

to BAROMETER PRESSURE signal from 4.6 BAROMETER PRESSURE TRANSDUCER.

Reference value Set O2 = Preset O

2 concentration (on Front panel).

Alarm table:

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OteS<%12 2 %001< OteS(>AMP 2 )%01+

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2

5 Optional PC board slot

Not used in this version.

4.6 Barometer pressuretransducer

Pressure sensor measuring the ambientpressure. The signal is used in the block8.11 PRESSURE CALCULATOR for the regulationof inspiratory flow in the main block 8INSPIRATORY VALVE UNIT – AIR as well as in themain block 9 INSPIRATORY VALVE UNIT – O

2.

The measured value can be read in theAlarm and messages display on the frontpanel, see chapter Calibration in the SV 300– Operating Manual.

4.7 Loudspeaker

For audible alarm generated by the regular(digital) monitor/alarm block 4.1 MONITOR/ALARM CPU.

4.8 Beeper

Tone generator for audible alarm controlledby the (analog) block 4.5 BACKUP ALARMSYSTEM.

4.9 Failure alarm box (FAB)

A FAILURE ALARM BOX (FAB) must be installed onSV 300 equipped with MON-PROM V5.01. Thealarm functions of the FAB are integrated onMON-PROM V6.00/PC 1608E and the FAB is notused on SV 300 equipped with MON-PROMV6.00/PC 1608E (or higher). See section”4 MONITORING” for further informationregarding PROM and PC board versions.

The FAB is mounted on the SV 300connector N81. All functionality of the SV300 AnalogI/O terminal N81 is available through theone-to-one connected FAB connector N81.

The FAB includes the functional blocks:

+24 V MONITOR

FAB INTERNAL MONITOR

ALARM CONTROL

A FAB BEEPER, a red LED, a push button andthe connector N81 (as described above) arealso included in the FAB.

The FAB is designed to detect loss of theSV 300 internal +24 V power and emitsaudible alarm in response to such a powerfailure or in case of a FAB internal failure.

For a further functional description of theFAB, contact your Siemens representative.

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2

F is one of two possible functions (6) or (7)stated below although the value of F usedwhen performing the calculation accordingto the formula (5) in each case is limited tomake sure that the calculated value of P

REF

will never exceed PREFmax

= Pmax

– 5 cm H2O.

If PREF (n)

= Pmax

– 5 cm H2O and P

DIFF (n) > 0

for three consequtive breaths a failure signal(LIM_PRESS.L) is transmitted to the block4.1 MONITOR/ ALARM CPU to activate the Airwaypressure alarm - ”Limited pressure”.

Normal procedure:

Definition of function (6):Assume the parameter PDIFF beeingcontinously filtered via low pass filterwith the time constant:

Tau = 9 sec for the mode PRVC

Tau = 18 sec for the mode VS

The filtered value F = PDIFF

x ( 1 – e -T/Tau)

T is the measured duration time of theforegoing breath cycle.)

The value of the parameter F during Normalprocedure is the low pass filtered value ofP

DIFF sampled at the end of the inspiration

(number n):

F(n)

= PDIFF (n)

x (1 – e -T(n) /Tau)

T(n)

is the measured time from end of inspi-ration number n – 1 to end of inspiration n.

During Normal procedure the value of theparameter F is limited to:

–3 cm H2O < F

(n) < 3 cm H

2O = max

amount

End of function (6)

The change of pressure reference levelfrom one breath to the next breath duringNormal procedure is a calculated, low passfiltered difference value.

Limitation 1: The change (increase ordecrease) of P

REF from one breath to the

next breath is limited to max 3 cm H2O.

Limitation 2: If during one inspiration any ofthe conditions (10) or (11) is valid asdescribed in block part 6.1.2 the inspirationwill be stopped and the pressure referencelevel for the next breath (n + 1) will bereduced:

PREF (n + 1)

= PREF (n)

– Reduction

Reduction = 0.75 x PIN USE

Max value of this Reduction = 20 cm H2O

Start up procedure:

The start up procedure consists of one testbreath (number: n = 1) and the following 3breaths (numbers: n = 2, 3 and 4).

PIN USE (1)

= 5 cm H2O

Definition of function (7):In order to achieve the values of the para-meter P

REF [ref. formula (5)] to be used

during the breaths number 2 and 3 and 4within the Start up procedure the values F

(n)

for n = 1 and n = 2 and n = 3 are needed:Each value of the parameter F during Startup procedure uses the formula

F(n)

= PDIFF (n)

x 0.75

Note: No use of low pass filter.

During Start up procedure the value of theparameter F is limited to

F(n)

< 20 cm H2O (= maximum value)

End of function (7)



2

The change of pressure reference level fromone breath to the next breath within these 4breaths is 75% of the change of pressure ascalculated by the above mentioned formula(4). Limitation: The increase of P

REF from

one breath to the next breath is limited tomax 20 cm H

2O.

For n > 3: The value of the parameter PREF

[ref. formula (5)] to be used during breathnumber 5, and following breaths, will followthe Normal procedure as described above.

The start up procedure is initiated at any oneof the following conditions (S) or (T):

(S): The Mode selector is changed to thismode (PRVC or VS).

(T): If at least 15 sec have passed since lastStart up procedure started and if at least 5breaths have passed since last Start upprocedure started and if then a single breathends with TV

M < 50% x TV

P. This condition

will normally occur at reconnection of apatient after disconnection.

SIMV (Vol. Contr.) + Pressure Support mode

For the mandatory breaths; see VolumeControl mode above. For the spontanousbreaths; see Pressure Support mode below.

SIMV (Press. Contr.) + Pressure Supportmode

For the mandatory breaths; see PressureControl mode above. For the spontanousbreaths; see Pressure Support/CPAP modebelow.

Pressure Support/CPAP mode

Pressure Support mode:

This mode is active if the front panel settingPressure Support Level above PEEP:> 2 cm H

2O

In this case the PRESSURE REGULATION PRESSUREREF signal will adopt the value:

PREF

= PEEP + Pressure Support Levelabove PEEP

using values according to correspondingsettings from the main block 1 FRONT PANEL.

CPAP mode:

This mode is active if the front panel settingPressure Support Level above PEEP- 2 cm H

2O.

In this case the PRESSURE REGULATION PRESSUREREF signal will adopt the value:

PREF

= PEEP level + 2 cm H2O



2

time and that period is used for this offsetzeroing.

Additionally, timing control of the offsetzeroing for the position signal within theblock 16.3 EXPIRATORY SOLENOID WITH POSITIONSENSOR is generated and transferred via theblock 15.4 VALVE ZEROING during INSPIRATIONTIME. The main block 16 EXPIRATORY VALVE(regulation of opening) is enabled duringexpiration time.

6.1.2. Respiratory timing

Timing is defined by the internal respiratoryphase control signals for INSP TIME and PAUSETIME and EXP TIME which are generated in thisblock. When the Mode selector is in anyother position than Ventilator off or Stand byone of these three control signals is alwaysactive (HI), only one at a time. PAUSE TIME isin use only if any of the Front panelfunctions Pause time % or Pause hold isactive. Three LEDs at the top end of the PC1605 marked INSP, PAUSE and EXP are used toindicate the current respiratory phase.

During controlled ventilation, as well as formandatory breaths, the respiratory phasecontrol signals are related to the front panelsettings Insp. time % and Pause time %and to the internal respiratory CLOCK signalwhich has a frequency defined by the frontpanel setting CMV frequency.

During SIMV modes the Front panel settingSIMV frequency is in use. The SIMVfrequency defines the duration of the SIMVcycle. The first part of each SIMV cycle is awaiting period referred to as the SIMVperiod. The duration of the SIMV period isdefined by the front panel setting CMVfrequency.

The INSP TIME signal is also used in the mainblock 18 EXPIRATORY FLOW LINEARIZATION forzeroing of the EXPIRATORY FLOW TRANSDUCERsignal in the block 18.3 ZERO OFFSET.

Additionally, timing control of the offsetzeroing for the inspiratory flow regulationwithin each INSPIRATORY VALVE UNIT isgenerated and transferred via the blocks15.4 VALVE ZEROING and 15.5 VALVE ENABLING.Thus the inspiratory valves are enabledduring inspiration time and (for the constantflow) during expiration time with thefollowing exception. This offset zeroingtakes place during each pause time if pausetime is available. When pause time is notapplied the enabling of the inspiratory valvesexcludes the first 40 ms of each expiration

Timing conditions

Definition of parameters:

PE = EXP. PRESSURE

PI = INSP. PRESSURE

The internal respiratory CLOCK signal is apulse train with the Clock frequency == 100 x Preset CMV frequency

Clock cycle = (Clock frequency)-1

Duration of SIMV PERIOD == 90 x Clock cycle

Breath cycle = (Preset CMV frequency)-1 == 100 x Clock cycle

SIMV cycle = (Preset SIMV frequency)-1

Numeric calculation note:Cycle in seconds = 60 x Cycle in minutes



2

Timing conditions for Start and for Stop ofINSPIRATION valid during different modesof ventilation:

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troppuSemuloV

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2

Explanation of Start and Stop conditions;Front panel setting on which it depends:

Start conditions

(B) Front panel initiation of a breath duringEXP. time;Start breath

(D) Patient initiation of On demand flowduring INSP. time:P

E < (PEEP – 2 cm H

2O);

Preset PEEP

(M) Ventilator start of a mandatory breathduring SIMV Modes: The first part ofeach SIMV cycle is a waiting period - theSIMV period. If no (P) occurs during aSIMV period, (M) occurs at the end ofthe SIMV period;Preset SIMV frequency and preset CMVfrequency

(P) Patient trigger during EXP. time (see 6.2);Preset Trigger sensitivity Level belowPEEP

(S) Mode change from any other mode tothis mode;Mode selector

(T) During normal procedure (as describedin 6.1.1) if at the end of inspiration themeasured Insp. tidal volume < 50% xpreset Insp. tidal volume (Further detailsin 6.1.1, PRVC and VS mode.);Preset Insp. tidal vol.

(V) Ventilator start of a breath; (V) occurseach time the internal respiratory CLOCKsignal has emitted 100 clock pulsessince last start of inspiration time;Preset CMV frequency.

Stop conditions

(0) Ventilator stop insp.;Time duration since last start insp. == (Preset insp. time %) x 1/100 x BreathcyclePreset Insp. time % andpreset CMV frequency

(1) INSP. FLOW < 5% x Peak INSP. FLOW duringsame inspiration

(2) INSP. FLOW < 25% x Peak INSP. FLOW duringsame inspiration andP

E > (PEEP + Pressure support level

above PEEP + 8 cm H2O);

Preset PEEP and preset PressureSupport Level above PEEP

(3) PE or P

I > Upper pressure limit;

Preset Upper pressure limit

(4) PI > (PEEP + Pressure ... level above

PEEP + 20 cm H2O);

Preset PEEP and preset Pressure(Control or Support) Level above PEEP.

(5) Duration of INSP. TIME > 80% x Breathcycle;Preset CMV frequency

(6) (Duration of the time when INSP. FLOW <25% x Peak INSP. FLOW during sameinspiration) > (Duration of the time whenINSP. FLOW > 25% x Peak INSP. FLOW duringsame inspiration)

(7) INSP. FLOW < Preset Insp. flow;Preset Insp. flow

(8) Measured Insp. tidal volume >100% x Preset Insp. tidal volume;Preset Insp. tidal vol.



2




Timing conditions valid during Pause time.Pause time is available only in VolumeControl Mode and mandatory breaths inSIMV (Volume Control):

(3) See above

(12) Duration of Pause time >Preset Pause time;Preset Pause time % and preset CMVfrequency

(13) (Duration of Inspiration time + Pausetime) > (80% x BREATH CYCLE);Preset CMV frequency

Additional condition used during VolumeSupport mode:

(A) If the block 4.1 MONITOR/ALARM CPUindicates active Apnea alarm;Preset Patient range

When above mentioned condition is true itwill lead to the following timing:

(A) Use of the mode Pressure Reg. VolumeControl (with Front panel Modeindication flashing).

(B) Start of inspiration time. The (B) reactionis inhibited by the block 6.1 MODE CPUduring inspiration time and during thefirst 40 ms after end of inspiration time.In SIMV Modes the started breath willbe a mandatory breath (independant ofSIMV cycle phase).

(D) During inspiration time, when Flowregulation is in use: Change to ”Ondemand flow” which means Pressureregulation with (PRESSURE REG. PRESSUREREF. level) = (Preset PEEP level).The (D) reaction is inhibited by the block6.1 MODE CPU during 40 ms from themoment of time when (7) is used tochange back to flow regulation.

(M) Start of Inspiration time. This will be amandatory breath.

(P) Start of Inspiration time. The (P) reactionis always inhibited by the block 6.1 MODECPU during Inspiration time and duringthe first 40 ms from end of Inspirationtime and during 100 ms from each startof Expiration time. In SIMV Modes thefirst (one) inspiration started within eachSIMV cycle is a mandatory breath.

(S) Initiation of the Start up procedure (withrepeat restriction as described in theblock part 6.1.1 ...PRVC and VS mode).

(T) Initiation of the Start up procedure (withrepeat restriction as described in theblock part 6.1.1 ...PRVC and VS mode).

(V) Start of Inspiration time.



2

(0) When using Pause time [in Volumecontrol or SIMV (Volume control)mandatory breath]:Start of Pause time.Else: Start of Expiration time.

(1) - (6) Start of Expiration time.

(7) If (8) is true: Start of Pause time(or if preset Pause time = 0: Start ofExpiration time).Else: Change back to Flow regulation.This ”else” reaction is inhibited by theblock 6.1 MODE CPU during 40 ms fromthe moment of time when (D) is used tochange to ”On demand flow”.

(8)-(13) Start of Expiration time.(9) represents a technical safetyfunction.

The above mentioned conditions, which areused in the block 6.1 MODE CPU, aremonitored in the following blocks:

(B) 2.1 PANEL CPU

(D) 6.2 PATIENT TRIGGER

(M) 6.1 MODE CPU

(P) 6.2 PATIENT TRIGGER

(S) 2.1 PANEL CPU

(T) 6.1 MODE CPU

(V) 6.1 MODE CPU

(1) - (2) 6.3 End inspiration indicator

(3) 4.1 MONITOR/ALARM CPU. (MON DIS INSPVALVES.L signal)

(4) - (5) 6.1 MODE CPU

(6) 6.3 END INSPIRATION INDICATOR

(7)-(13) 6:1 MODE CPU

Additional timing conditions applicablefor SV 300A

As long as the front panel setting forAutomode is in position Off and alsoimmediately after switching the front panelsetting for Automode into position Off thefunction of the ventilator with the Modeselector in one of the positions:

1. Pressure Control/Support

2. Volume Control/Support

3. Press. Reg. Vol. Control/Support

is identical to to what is described (block6.1.1) for SV 300 Mode selector positions

1. Pressure Control

2. Volume Control

3. Pressure Reg. Volume Control.

When the front panel setting for Automodeis in position On the function of theventilator can switch between performingabove mentioned Control mode andperforming the following correspondingSupport mode (according to description inthe block 6.1.1):

1. Pressure Support

2. Volume Support

3. Volume Support.

The switch over from any of the 3 Controlmodes to its above mentioned correspon-ding Support mode will take place at thefollowing condition:

When the start condition (P) Patient triggeroccursandThe two preceeding inspirations were bothstarted by the same start condition (P).



2

6.2 Patient trigger

This block determines if a signal INTERNALPATIENT TRIG should be sent to the block 6.1MODE CPU in order to start a new breath.

The signal is depending on

• Set PEEP value (PEEP LEVEL)

• Set Trigg. sensitivity value (TRIGG. SENSITIVITY)

• Difference between inspiratory flow (INSPFLOW) and expiratory flow (EXP FLOW)

• Expiratory pressure (EXP PRESSURE).

During expiration time (INSP FLOW is keptconstant and) the difference INSP FLOW –EXP FLOW is monitored in this block. Thisdifference is positive if EXP FLOW is less thanINSP FLOW (which is the case if the patient isinhaling).

The automatic switch back from abovementioned Support mode to its correspon-ding Control mode will take place at thefollowing condition:

In the moment when the time duration sincelast foregoing Patient trigger (P) reaches thefollowing value (depending on the frontpanel setting for Patient range):

Adult: 12 s

Pediatric: 8 s

Neonate: 5 s.

Conditions at which the trigger signal PATIENTTRIG is activated:

• When the front panel setting Triggersensitivity below PEEP is set within itsscale between 0 and -17 mbar a triggersignal is generated if the mentioned flowdifference reaches a level equal to INSPFLOW and at the same time the EXP PRESSUREsignal reaches down to the trigger level(pressure level). The trigger level iscalculated from the front panel settings forPEEP and Trigger sensitivity below PEEP(according to the knob scale).

• When the front panel setting Triggersensitivity below PEEP is set to a certainpart from the right end within the colourmarked range, a trigger signal is generatedif the mentioned flow difference reaches alevel equal to corresponding part of theINSP FLOW.

The generated trigger signal is filtered bythe block 6.1 MODE CPU and then used astrigger signal to immediately start the nextinspiration. This is simultaneously indicatedby two yellow LEDs flashing at the right lowend of the front panel pressure bargraph.



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6.3 End inspiration indicator

During inspiration time when pressureregulation is used, except in PressureControl mode or mandatory breaths inSIMV(Press. Control) mode, the momentwhen the inspiration is about to stop isnormally determined in this block (a START EXPsignal is generated). Thus this blockdetermines when a signal, INTERNAL STARTEXP.H, should be sent to the block 6.1 MODECPU in order to start an expiration.

This output signal is depending on:

• Expiratory pressure (EXP PRESSURE).

• Inspiratory flow (INSP FLOW)

• PRESSURE REGULATION PRESSURE REF (N43:B3).

6.4 Pressure PID control

For pressure regulation the INSP PRESSUREsignal from the pressure transducer in themain block 12 INSPIRATORY PRESSURE is used asactual value in this controller block.PRESSURE REGULATION PRESSURE REF signal isused by the PRESSURE PID CONTROL asreference for the pressure. Additionally theEXP PRESSURE signal from the pressuretransducer in the main block 13 EXPIRATORYPRESSURE is used to adjust this referencelevel for the pressure. This adjustment -acompensation for pressure drop in theinspiratory airway- is to achieve a resultingpressure level in the patient system -generated via the main blocks 8 and 9(Inspiratory valve units) - equal to PRESSUREREGULATION PRESSURE REF (= P

REF ) as measured

by the block 13.2 PRESSURE TRANSDUCER forExpiratory pressure. This normally results ina pressure level at the Y-piece (= close tothe patient) which corresponds to settingson the main block 1 FRONT PANEL even if thereis a pressure drop in the inspiratory tubingbetween the block 11.1 INSPIRATORY MIXINGPART and the Y-piece (for example whenusing an active humidifier). Such a pressure

drop up to 15 cm H2O is compensated in

this way.

The actuating signal from the PRESSURE PIDCONTROL output is used by the block 7.3 MIXERas reference for the total flow (PRESSUREREGULATION FLOW REF).

6.5 I/O

This block is an interface for the input andoutput signals (to and from this PC-board).

Example of output:

Disabling signals for inspiratory valves(ZEROING INSP VALVES).



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7 Inspiratory control

This main block consists of the boardPC 1616 INSPIRATORY CONTROL including itsMICROPROCESSOR MODULE PC 1588.

7.1 Mixer CPU including MIX-PROM functions

This block includes the board PC 1588 witha MIX-PROM. Some details of the Micro-processor module PC 1588 are mentioned insection General in this chapter. The MIX-PROMfunction is a control function for the block7.3 MIXER.

FLOW REF overrange

The overrange indication signal OVERRANGE.H(going to the block 4.1 MONITOR/ALARM CPU) isactivated in case the level of the input signalFLOW REF is above 9.9 V during more than50% of the duration of one Inspiration timeor during more than 200 ms.

Since the scale factor of the FLOW REF signalis 3/18/45 V/l/s (Adult/Pediatric/Neonate) thisimplies a limit value for the flow referencesignal FLOW REF concerning overrangeindication as shown in the following table:

7.2 Inputs

This block is a multiplexor for input signalsto the main block 7 INSPIRATORY CONTROL.

Example of input:

• Front panel setting for O2 concentration

(O2 CONC SETTING).

7.3 Mixer

Input signals used in this block are:

• O2 CONC SETTING (From main block 1 FRONT

PANEL)

• One of the two flow reference signals(from main block 6 REFERENCE & TIMING)

Controlled by the block 7.1 MIXER CPU theflow reference signal in use is split up intopartial flow reference signals used in themain blocks 8 INSPIRATORY VALVE UNIT – AIR and9 INSPIRATORY VALVE UNIT – O

2:

• AIR FLOW REF and

• O2 FLOW REF

The sum of these reference level signals(internal signal TOT. FLOW REF) corresponds tothe flow reference input signal in use.

When the function Oxygen breaths isactivated – from main block 1 FRONT PANEL –the O

2 CONCENTRATION value used for the split

up of the flow reference signal in this block7.3 MIXER is 100% during 20 breaths orduring 1 minute (whichever represents theshorter time).

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2

Patient unit – Pneumaticsection

The Pneumatic section consists of the mainblocks 8 – 19 which are described below.

A ”mother” board, PC1607 PNEUMATICINTERCONNECTION, provides signal connectionsvia connectors (but no electronic functions).

8 Inspiratory valve unit – Air

The inspiratory valve units for AIR andO2 are factory calibrated.

The adjustment potentiometer which issituated at the top of each inspiratoryvalve unit must not be adjusted

Each inspiratory valve unit must not bedisassembled further than described inthe Operating Manual, chapter 3000hours overhaul.

1. Bacteria filter2. Inspiratory valve temperature sensor3. Supply pressure transducer4. Flow transducer (Delta pressure transducer and net)5. Nozzle unit with valve diaphragm6. Inspiratory solenoid with position sensor

8.1 Air inlet

The air inlet nipple is a quick-coupling wherecompressed air is connected to theventilator. The design of the air inlet nippleand the colour marking ring varies accordingto the standard chosen.

A non-return valve for the air inlet is locatedin the inlet filter cover, see 8.2 BACTERIAFILTER.

8.2 Bacteria filter

The BACTERIA FILTER protects the ventilatorfrom bacteria and particles in the gasdelivered to the air inlet. Service interval3000 h of operation for exchange of theinspiratory valve unit BACTERIA FILTER.

The filter housing and the filter cover isprovided with matching guide pins. Theseguide pins will make it impossible to mountthe filter cover (with inlet nipple) on wronginspiratory valve unit.

A non-return valve for the gas inlet is locatedin the inlet filter cover. This valve willsuppress short pressure drops in the gassupply.

The non-return valve is also designed toslowly evacuate compressed gas from theinspiratory valve unit if the gas supply to theventilator is disconnected.

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2



8.7 Inspiratory solenoid withposition sensor

The gas flow through the INSPIRATORY VALVEUNIT is regulated by the INSPIRATORY SOLENOIDvia the 8.6 NOZZLE UNIT.

The solenoid receives power from the block8.22 CURRENT POWER. The current supplied tothe solenoid is regulated so that theinspiratory valve unit will deliver a gas flowaccording to the front panel settings.

An optical sensor on the board PC 1593POSITION SENSOR I mounted at the bottom ofthe inspiratory solenoid detects its positionand the resulting INSP. VALVE POSITION signal isused in the block 8.20 POSITION PD CONTROL.

8.8 Valve code transponder

The inspiratory valve units are provided withan electrical code that states the valve type(AIR, O

2, etc). This valve type information is

transmitted back via the 15 VALVE CONTROL tothe 7.1 MIXER CPU if required by the 7.1 MIXERCPU.

The VALVE CODE TRANSPONDER handles thisserial communication between the inspi-ratory valve unit and the 7.1 MIXER CPU.

8.9 Inspiratory valve key

The inspiratory valve units are provided witha mechanical key, INSPIRATORY VALVE KEY, toprevent that the inspiratory valve unit ismounted in the wrong slot.

The valve key consists of a plastic guidemounted underneath the inspiratory valveunit and a corresponding guide mounted onthe pneumatic section base.

8.3 Inspiratory valve temperaturesensor

The temperature of the supplied gas ismeasured by the INSPIRATORY VALVETEMPERATURE SENSOR. This sensor is a part ofPC 1637 and it is situated in the gas flow.

The output signal from this sensor is used in8.13 DELTA PRESSURE AMPLIFIER to compensatefor gas temperature variations.

8.4 Supply pressure transducer

The pressure of the supplied gas ismeasured by the SUPPLY PRESSURE TRANSDUCER.

The output signal from this transducer isamplified in 8.10 PRESSURE AMPLIFIER and thenused in 8.11 PRESSURE CALCULATOR to calculatethe absolute pressure of the gas.

8.5 Delta pressure transducerand net

The gas flows through a net (resistance)which causes a pressure drop. The pressureis measured on both sides of this net andthe differential pressure value is thenamplified in 8.13 DELTA PRESSURE AMPLIFIER.

8.6 Nozzle unit

The NOZZLE UNIT contains an O-ring and avalve diaphragm. The valve diaphragm,controlled by the 8.7 INSPIRATORY SOLENOID,regulates the gas flow through theinspiratory valve unit.

Service interval 3000 h of operation forexchange of the valve diaphragm and O-ring.After replacement, allow the diaphragm tosettle during approx. 10 minutes before gaspressure is connected to the inspiratoryvalve unit.



2

8.10 Pressure amplifier

The PRESSURE AMPLIFIER amplifies the inputsignal from 8.4 SUPPLY PRESSURE TRANSDUCER.The output signal from this amplifier,representing the relative gas supplypressure, is used in:

• 8.11 PRESSURE CALCULATOR to calculate theabsolute pressure of the gas

• 8.12 SUPPLY PRESSURE AMPLIFIER.

8.11 Pressure calculator

The PRESSURE CALCULATOR calculates the sumof:

• Gas pressure (input from 8.10 PRESSUREAMPLIFIER) and

• Barometer pressure (input from 4.6BAROMETER PRESSURE TRANSDUCER).

The result of this calculation is the absolutepressure of the gas.

Output signals from the pressure calculatorare used in:

• 8.15 FLOW CALCULATOR

• 8.18 VALVE POSITION CALCULATOR.

8.12 Supply pressure amplifier

The relative gas supply pressure, input signalfrom 8.10 PRESSURE AMPLIFIER, is amplified inthe SUPPLY PRESSURE AMPLIFIER.

Output signals from this block is used in:

• 4 MONITORINGto show the correspondingrelative gas supply pressure on the frontpanel

• 8.13 DELTA PRESSURE AMPLIFIER.

8.13 Delta pressure amplifier

The input signal from 8.5 DELTA PRESSURETRANSDUCER is amplified in the DELTA PRESSUREAMPLIFIER. The output signal is influenced bythe relative gas supply pressure value from8.12 SUPPLY PRESSURE AMPLIFIER as well as from8.3 INSPIRATORY VALVE TEMPERATURE SENSOR.

The potentiometer at the top of theINSPIRATORY VALVE UNIT implies a limited(approx. ± 3%) adjustment possibility of thissignal. This signal is not a directlyproportional part of the flow and no serviceadjustment must be made. If the INSPIRATORYVALVE UNIT proves to be out of specification itis recommended -for safety reason- toexchange it.

The output signal is used in 8.15 FLOWCALCULATOR.

8.14 Zero offset

The possible offset of the pressure dropsignal, measured by 8.5 DELTA PRESSURETRANSDUCER, is set to zero in the beginning ofeach breath cycle, i. e. when the flowthrough the inspiratory valve is zero.

The block ZERO OFFSET deliveres an offsetcompensation voltage to 8.13 DELTA PRESSUREAMPLIFIER. The zeroing function is controlledfrom 15.4 VALVE ZEROING.

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8.15 Flow calculator

The flow depending signal from 8.13 DELTAPRESSURE AMPLIFIER and the absolute supplypressure depending signal from 8.11PRESSURE CALCULATOR are used to generate alinearized actual gas flow signal (AIR FLOW).

This flow signal is a flow measurementreferenced to standard barometric pressure(1013 mbar, 760 mm Hg). For conversion toambient pressure, see section "Conversionfor flow and volume to achieve reference toambient pressure" in the Operating Manual.

8.16 Flow I control

Controller block comparing actual AIR FLOWand desired AIR FLOW REF. The actuatingoutput signal is used to influence the block8.17 COMPENSATION ±5%.

8.17 Compensation ±5%

The output signal corresponds to the inputsignal AIR FLOW REF with an adjustmentcontrolled by the block 8.16 FLOW I CONTROL.The adjustment (compensation) is limited toa maximum of 5%.

8.18 Valve position calculator

This function is an additional compensatingelement for the regulation where the actualabsolute supply pressure value from theblock 8.11 PRESSURE CALCULATOR and thedesired AIR FLOW REF signal compensated inthe block 8.17 COMPENSATION ±5% generatean activating signal which is used as a basicreference for POSITION of the inspiratory valve.

8.19 Flow PI control

Controller block comparing actual AIR FLOWfrom the block 8.15 FLOW CALCULATOR withdesired AIR FLOW REF signal compensated inthe block 8.17 COMPENSATION ±5%. Theactuating output signal is added as a finaladjustment to the basic position signal fromthe block 8.18 VALVE POSITION CALCULATORgenerating the desired POSITION REF signal forthe block 8.20 POSITION PD CONTROL.

8.20 Position PD control

Controller block comparing actual INSP. VALVEPOS. value from the position sensor in theblock 8.7 INSPIRATORY SOLENOID WITH POSITIONSENSOR and desired POSITION REF signalmentioned in the block 8.19 FLOW PI CONTROL.The actuating output signal (together with asignal compensating for the supplypressure) is used as the desired INSP. VALVECURRENT REF signal in the block 8.21 CURRENTCONTROL.

8.21 Current control

Consists of the board PC 1585 CURRENTCONTROL.

Controller block regulating the current goingto the block 8.7 INSPIRATORY SOLENOID WITHPOSITION SENSOR according to the desired inputsignal IINSP. VALVE CURRENT REF from the block8.20 POSITION PD CONTROL. The actuatingoutput signal is a pulse train with constantfrequency of 30 kHz and pulse widthmodulation used in the block 8.22 CURRENTPOWER.



2

8.22 Current power

Consists of the board PC 1586 CURRENTPOWER.

Driving stage for the energy going to theblock 8.7 INSPIRATORY SOLENOID WITH POSITIONSENSOR. The result of the output signal is acertain opening of the INSPIRATORY VALVE.

2



10 Inspiratory valve unit –Optional

If the third valve slot is not used for equip-ment for e. g. NO gas administration ornebulizing drugs, a valve dummy withoutvalve function must be mounted in the thirdvalve slot on the ventilator.

It contains one electronic board PC 1634DUMMY VALVE CONNECTION. It responds internallyas a 8.8 VALVE CODE TRANSPONDER indicatingthat this valve function is not available.

It is also provided with a mechanical code.See 8.9 INSPIRATORY VALVE KEY.

As mentioned above, the valve dummy canbe replaced by an inspiratory valve foradministration of e. g. NO gas or by equip-ment for nebulizing drugs (Servo UltraNebulizer 345). These products aredescribed in separate documents.

9 Inspiratory valve unit – O2

The INSPIRATORY VALVE UNIT – O2 works in the

same way as the 8 INSPIRATORY VALVE UNIT – AIR.The Description of functions is valid for bothtypes of inspiratory valve units.

There are, however, some differences in thedesign of the different valve units:

• The electrical code that states the valveunit type, see 8.8 VALVE CODE TRANSPONDER

• The mechanical code that states the valveunit type, see 8.9 INSPIRATORY VALVE KEY

• A strapping on PC 1602 to change thelinearization, see 8.15 FLOW CALCULATOR

• A different inlet nipple, see 9.1 O2 INLET.

9.1 O2 inlet

The O2 inlet nipple is a quick-coupling where

O2 is connected to the ventilator. The design

of the O2 inlet nipple and the colour marking

ring varies according to the standardchosen.

A non-return valve for the O2 inlet is located

in the bacteria filter cover, see 8.2 BACTERIAFILTER.

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11.4 Safety valve

The safety valve function depends on itssolenoid and on its factory trimmed springs.The solenoid can be electrically activatedonly from the 11.5 SAFETY VALVE DRIVER. Whenthe valve is opened it connects theINSPIRATORY PIPE directly to ambient air thusenabling a decrease in pressure. The valvecan open in two different ways.

1. When the solenoid is not activated (viathe SAFETY VALVE DRIVER) the mechanicalspring which is built into the solenoidpushes the solenoid axis upwards. Thisactuates the safety valve to be opened.This is normal safety (pop off) function.This is also the case when the MODESELECTOR is set at Ventilator Off.

2. The two springs which hold the safetyvalve disc in position are factorytrimmed to a tension such that theSAFETY VALVE will let out gas if thepressure inside the INSPIRATORY PIPEshould exceed 120 cm H

2O (even if the

solenoid is activated). This is an extrasafety function, and the situation willnormally not occur.

During start up, the solenoid is electricallyactivated so that the solenoid axis is pulleddown (with a clicking sound). This is thenormal operational position of the solenoid;the SAFETY VALVE is normally kept closed.

11.5 Safety valve driver

The SAFETY VALVE DRIVER consists of theelectronic board PC 1613 with threeconnection cables:

• It is connected (at the connector P53) via acable to the 21 POWER SUPPLY. The safetyvalve is protected by a PTC resistor in the21 POWER SUPPLY.

• It is connected (at N54) via a cable to theboard PC 1607 PNEUMATIC INTERCONNECTION(connector P23).

• It is connected (at N55) via a cable to the11.4 SAFETY VALVE solenoid. The function ofthis block is to provide power to the SAFETYVALVE solenoid controlled, by the inputsignal DIS SAF VALVE AND 24V (via P54:3) fromthe main block 4 MONITORING.



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12 Inspiratory pressure

The function of this main block is tomeasure the pressure in the 11 INSPIRATORYCHANNEL and generate a corresponding signalINSP. PRESSURE via the board PC 1607PNEUMATIC INTERCONNECTION (N24:C7) to themain blocks 4 MONITORING and 6 REFERENCE &TIMING.

12.1 Bacteria filter

This filter protects the 12.2 PRESSURETRANSDUCER on the board 12.3 PRESSUREAMPLIFIER from contamination.

Service interval 3000 h of operation forexchange of the inspiratory pressure BACTERIAFILTER.

12.2 Pressure transducer

This differential PRESSURE TRANSDUCER is anintegrated part of the board 12.3 PRESSUREAMPLIFIER mounted together with a siliconrubber connection piece. It refers thepressure to ambient pressure and gives alinear measurement in the range –20 cm H

2O

to +120 cm H2O.

Pressure exceeding ±200 cm H2O must be

avoided.


This board PC 1611 contains:

• a pressure transducer

• a generator of +5V REFERENCE VOLTAGE

• an amplifier for the pressure signal

• the two potentiometers for calibration ofzero offset and gain.

When calibrated according to the OperatingManual, chapter Calibration, the PRESSURE OUTsignal (P24:C7) will have a scale factor of75 mV/cm H

2O.

2



14 Expiratory channel

The expiratory channel conveys theexpiratory gas from the patient systemthrough the patient unit.

14.1 Expiratory inlet withmoisture trap

The function of the moisture trap is toreduce the condensation of moisture in theexpiratory channel. The gas temperature isfirst decreased and then increased in orderto reduce the condensation before the gasenters the 14.4 EXPIRATORY CONNECTION TUBE.

If moisture is condensated in the moisturetrap, it is collected in a plastic container.Empty the plastic container if necessary.When removing the plastic container, a built-in valve closes to keep the patient systemtight.

14.2 Expiratory connection tube

The inside bottom of this silicon rubber tubehas a slope down towards the 14.1 EXPIRA-TORY INLET WITH MOISTURE TRAP.

14.3 Expiratory flow transducer

The gas flows through the expiratory flowtransducer in two parallel channels, onelarge main channel, and one smallmeasuring channel. The main channel isfitted with a wire mesh net, the resistanceof which causes a certain proportion of thegas to flow through the measuring channel.The flow through, and the differentialpressure across, the measuring channel actson a small metal disc (”flag”), which, via ametal pin presses on a small semiconductorstrain gauge. This consists of diffusedresistors on both sides of an elastic siliconerod. The resistors are connected as a part ofa Wheatstone bridge, the other part of which

13 Expiratory pressure

The function of this main block is tomeasure the pressure in the 14 EXPIRATORYCHANNEL and generate a signal EXP. PRESSUREvia PC 1607 PNEUMATIC INTERCONNECTION(N25:C7 from P24:C7) to the main blocks 4MONITORING, 6 REFERENCE & TIMING and 15 VALVECONTROL.

A recommendation to regularly exchangethe 13.1 BACTERIA FILTER with its connectiontube and nipple is given in the OperatingManual, chapters Routine cleaning, 1000hour overhaul and 3000 hour overhaul withcomplete cleaning.

13.1 Bacteria filter

This filter protects the 13.2 PRESSURETRANSDUCER on the board 13.3 PRESSUREAMPLIFIER from contamination.

Service interval 1000 h of operation forexchange of the inspiratory pressure BACTERIAFILTER. The filter is also replaced during theRoutine cleaning.

13.2 Pressure transducer

See 12.2


See 12.3



2

is situated on the 14.4 EXPIRATORY FLOWAMPLIFIER. The more flow in the channel, thehigher the pressure on the strain gauge. Thechange in resistance in the Wheatstonebridge is converted to a correspondingsignal voltage.

A resistor, 220 Ohms, 6W, is moulded intothe transducer and is used for heating of theexpiratory flow transducer. The transducer isheated to approximately 40oC (104oF) toprevent condensation of water vapour. Theheating is controlled from the main block18 EXP. FLOW LINEARIZATION. If water shouldcondense in the expiratory flow transducer,the resistance of the wire mesh netincreases. Thus the output signal willincrease. This can be seen on the digitaldisplay and the bargraph for EXPIRED MINUTEVOLUME, as an increased reading. Theaccumulation of medicaments, mucus andsecretion in the expiratory flow transducergives the same result.

For details on cleaning and calibration of theflow transducer, see the chapters Routinecleaning and Calibration in the OperatingManual. Service interval 1000 h of operationfor exchange of the wire mesh net.

14.4 Expiratory flow amplifier

This block consists of the board PC 1623EXPIRATORY FLOW AMPLIFIER with its plastichousing and the expiratory flow connectioncable.

Two potentiometers and a green indicatorLED are used when calibrating the flowsignal according to chapter Calibration in theOperating Manual.

The change in resistance in the 14.3 EXPIRA-TORY FLOW TRANSDUCER is converted to acorresponding signal voltage. This signal, anon-linear function of the flow, is handled inthe main block 18 EXP. FLOW LINEARIZATION.

A temperature sensor mounted close to the14.3 EXPIRATORY FLOW TRANSDUCER measures itstemperature. The signal TEMP SENSOR is usedby the TRANSDUCER TEMPERATURE CONTROL blockin the main block 18 EXP. FLOW LINEARIZATION.

The connector (N30) at the end of theexpiratory flow connection cable can bedisconnected from the 18 EXP. FLOWLINEARIZATION (PC 1615: N30). Thus an extra14 EXPIRATORY CHANNEL can be calibrated andready for use, but only in the ventilator it hasbeen calibrated in.

14.5 Expiratory valve tube

This tube connects the 14.3 EXPIRATORY FLOWTRANSDUCER with the 14.6 EXPIRATORY OUTLET. Itis mounted on a holder pin and it contains afitting which connects via a nipple to themain block 12 EXPIRATORY PRESSURE. TheEXPIRATORY VALVE TUBE is squeezed betweenthe metal bars of the 16 EXPIRATORY VALVE.

Service interval 1000 h of operation forexchange of the EXPIRATORY VALVE TUBE.

14.6 Expiratory outlet with non-return valve

The gas from the patient system leaves theventilator via this outlet. It contains a non-return valve. Its rubber membrane ismounted on a valve seat disc which can beremoved from the expiratory outlet.

2



15.3 O2 concentration amplifier

This block, the O2 CONCENTRATION AMPLIFIER,

amplifies the signal from 11.3 O2 CELL.

The output signal is amplified to 90 mV/%O2

at 1013 mbar (760 mmHg) ambientbarometric pressure. This output signal isused in:

• 4 MONITORING to monitor the O2 concen-

tration where it is distributed to 1.5 O2

CONCENTRATION to display the measuredvalue on the front panel.

• 18.1 LINEARIZING CPU for compensation ofthe EXP. FLOW value.

15.4 Valve zeroing

Zero offset is handled through:

• Timing control for the zeroing of the actualgas flow and position signals within themain blocks 8 INSPIRATORY VALVE UNIT – AIRand 9 INSPIRATORY VALVE UNIT – O

2 when the

real actual gas flow is zero (normallyduring pause time).

• Timing control for the zeroing of the actualposition signal within the main block 16EXPIRATORY VALVE.

The timing control mentioned above isexecuted in cooperation with the block 15.5VALVE ENABLING.

15.5 Valve enabling

Valve enabling/disabling is handled through:

• Timing control (enabling) of the mainblocks 8 INSPIRATORY VALVE UNIT – AIR and9 INSPIRATORY VALVE UNIT – O

2.

• Timing control (disabling) of the main block16 EXPIRATORY VALVE.

15 Valve control

This main block consists of the boardPC 1622 VALVE CONTROL.

15.1 PEEP PID control

Controller block comparing actual EXP.PRESSURE signal from the main block 13EXPIRATORY PRESSURE with desired PEEP LEVELsignal according to front panel setting.

In order to somewhat decrease theexpiratory resistance at high expiratoryflows, the EXP. FLOW signal from the block18.5 GAS COMPOSITION COMPENSATION is used inaddition to the actual EXP. PRESSURE value insuch a way that a high EXP. FLOW value resultsin a somewhat bigger opening of theEXPIRATORY VALVE compared to when the EXP.FLOW value is small.

The actuating output signal is used as adesired POSITION REF signal for the block 15.2POSITION PD CONTROL.

15.2 Position PD control

Controller block comparing actual EXP. VALVEPOSITION signal from the block 16.3 EXPIRATORYSOLENOID WITH POSITION SENSOR with desiredPOSITION REF signal from the block 15.1 PEEPPID CONTROL. The actuating output signal isused as desired EXP. VALVE CURRENT REF for theblock 16.1 CURRENT CONTROL.



2

16 Expiratory valve

The function of this main block is tosqueeze the 14.5 EXPIRATORY VALVE TUBE in aregulated way.

16.1 Current control

Consists of the board PC 1585 CURRENTCONTROL.

Controller block regulating the current goingto the block 16.3 EXPIRATORY SOLENOID WITHPOSITION SENSOR according to the desired inputsignal EXP. VALVE CURRENT REF from the block15.2 POSITION PD CONTROL. The actuatingoutput signal is a pulse train with constantfrequency of 30 kHz and pulse widthmodulation used in the block 16.2 CURRENTPOWER.

16.2 Current power

Consists of the board PC 1586 CURRENTPOWER.

Driving stage for the energy going to theblock 16.3 EXPIRATORY SOLENOID WITH POSITIONSENSOR. The result of the output signal is acertain opening of the EXPIRATORY VALVE.

16.3 Expiratory solenoid withposition sensor

The EXPIRATORY SOLENOID controls the openingthrough the 14 EXPIRATORY CHANNEL bysqueezing the 14.5 EXPIRATORY VALVE TUBE todesired position.

The solenoid receives power from the block16.2 CURRENT POWER. The power supply to thesolenoid is regulated so that the remainingpressure in the patient system towards theend of the expiration time is kept on thePEEP level according to front panel setting.

An optical sensor on the board PC 1594POSITION SENSOR E mounted at the bottom ofthe expiratory solenoid detects its positionand the resulting EXP. VALVE POSITION signal isused in the block 15.2 POSITION PD CONTROL.Offset zeroing for the EXP. VALVE POSITIONsignal is controlled from the 6.1 MODE CPU viathe block 15.4 VALVE ZEROING.

17 Optional interface

Not used in this version.

2



18.4 Expiratory flow linearizer

Analog linearizing circuit using the unlinearflow signal from the 14.4 EXPIRATORY FLOWAMPLIFIER generating a linear signalrepresenting the measured expiratory flow.This signal is used by the block 18.5 GASCOMPOSITION COMPENSATION.

18.5 Gas compositioncompensation

The measured expiratory flow signal fromthe block 18.4 EXPIRATORY FLOW LINEARIZER isadjusted for the contents of oxygen and forthe ambient pressure resulting in the outputsignal EXP. FLOW. This limited adjustmentfunction is controlled by the block 18.1LINEARIZING CPU.

The resulting flow signal is a flow measure-ment referenced to standard barometricpressure (1013 mbar, 760 mm Hg). Forconversion to ambient barometric pressure,see section "Conversion of flow and volumeto get reference to ambient pressure" in theOperating Manual.

18Expiratory flowlinearization

This main block consists of the boardPC 1615 EXP. FLOW LINEARIZATION . The purposeof this main block is to linearize the outputsignal for expiratory flow.

18.1 Linearizing CPU includingLIN-PROM functions

The LINEARIZING CPU will calculate acompensation factor for the flow outputsignal (EXP. FLOW). This compensationdepends on:

• Gas composition (O2 concentration)

• Expiratory pressure

• Barometric pressure.

18.2 Transducer temperaturecontrol

The block TRANSDUCER TEMPERATURE CONTROLuses the temperature signal (TEMP. SENSOR)from the 14.4 EXPIRATORY FLOW AMPLIFIER toregulate the temperature in the 14.3EXPIRATORY FLOW TRANSDUCER by controlling thecurrent to its heating resistor.

18.3 Zero offset

Automatic zeroing of the unlinear flow signalfrom the 14.4 EXPIRATORY FLOW AMPLIFIER ismade every breath when the actual realexpiratory flow is zero (during inspirationtime).

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Note regarding the +24 V PO; At each ofthese pins at N77 and N78 it is allowed totake out a maximum of 3 A. However, thetotal current from these pins is not allowedto be more than 4 A alltogether.

As indicated by the signal name, all controlsignals are buffered which makes eachoutput pin short-circuit proof.

The power supply +24 V PO at N77 and N78is disconnected if:

• The ventilator runs in internal batterymode

• +24 V PO is short circuited

• The power section is overheated, approx.48°C (118°F).

The power supply (+24 V PO) is automaticallyreconnected when conditions return tonormal.

21 Power supply

The power supply, as described below, is allincluded in PC 1618.

This description refers to PC 1618D. Somefunctional deviations in older versions ofPC 1618 are also described.

Even when the mode selector is set toVentilator Off, there is still live current onPC 1618:

• +5 V and +24 V if the power source isMains or an External battery

• +24 V LOW POWER REG if the power sourceis the Internal battery.

Always disconnect mains power supply aswell as external and internal batteries beforeperforming any service intervention on thepower section.

21.1 Auxiliary outputs

There are two AUXILIARY OUTPUTS on thepower section casing, one 9-pin connector(N77) and one 15-pin connector (N78).


Only accessories, supplies or auxiliaryequipment listed in Siemens-Elema catalogs(”Products and accessories” Order No.90 34 562 E323E and ”Spare and exchangeparts” Order No. 90 34 570 E323E) must beconnected to or used in conjunction with theventilator.Warning: Use of accessories and auxiliaryequipment other than those specified inthese catalogs may degrade safety andperformance of the ventilator.



2

21.2 Voltage distribution

The different voltage levels used in theventilator are regulated in and distributedfrom this block. The fuse F1, rated F 6.3 A,limits the total +24 V supply current.

The distributed voltage levels are:

• +24 V: (+24 V FUSED) fused at F2, ratedF 1.6 A, via P74

• +24 V: (+24 V) limited at R33, a PTCresistor rated 1.1 A at 20°C, for the 11.4SAFETY VALVE via P73

• +24 V: (+24 V VALVE) from the electronicVALVE POWER SWITCH via P74

• +24 V: (+24 V LOW POWER REG) used only inthe mode selector via P70

• +24 V: (+24 V PO) unregulated voltage,21 – 34 V, via the auxiliary outputs N77and N78

• +15 V: (V+) regulated in the DC/DCCONVERTER via P74

• -15 V: (V-) regulated in the DC/DC CONVERTERvia P74

• +5 V: (VC5) regulated in the INTERNAL 5 VREGULATOR and used only internally inPC 1618

• +5 V: (+5 V) regulated in the DC/DCCONVERTER via P74

• +5 V: (+5 VL) regulated in the DC/DCCONVERTER used only in the front panel viaP74.

The battery connections are equipped withfuses:

• Internal battery connection is fused at F3,rated F 6.3 A.

• External battery connection is fused at F4,rated F 6.3 A.

The number of fuses on PC 1618 and thelocation of these fuses can vary dependingon the different PC-board versions.

21.3 Voltage control & Timing

This block administrates the different powersupply sources.

If power suppy is lower than the limitsstated below, the external battery willautomatically be used as power source.If no external battery is connected, the inter-nal battery will be used as power source.

• Mains is used as power supply source aslong as mains power is connected and thevoltage level, detected by the +24 VVOLTAGE DETECTOR, is above 19.2 V.

• External battery is used as power supplysource:

– if the external battery voltage level isabove 23 V in the moment when it isconnected and

– as long as the voltage level in theconnected external battery is above21.5 V.

Older versions of PC 1618:The 23 V limitation mentioned above doesnot exist and the external battery voltagelevel, detected by a EQUIPOTENTIAL DETECTION,must be above 20.25 V.

• Internal battery is used as power supplysource as long as the internal batteryvoltage level is above 19.5 V. If the voltagelevel drops below 19.5 V, no power supplyis distributed to the ventilator valves.

Older versions of PC 1618:The internal battery voltage level, detectedby a EQUIPOTENTIAL DETECTION, must be above18.5 V.

The battery voltage levels can be displayedin the Alarm and Message display on thefront panel. The displayed value "Internal" isthe charging voltage at the internal batteryconnection (P72).

2



21.4 Power temperature control

A NTC-resistor on PC 1618 senses the airtemperature inside the power section.

If the air temperature inside the powersection exceeds approx. 41°C (106°F), the19.1 COOLING FAN is turned on. When thetemperature drops below approx. 40°C(104°F), the fan is turned off.

If the air temperature inside the powersection exceeds approx. 48°C (118°F), the+24 V power supply (+24 V PO) to theauxiliary outputs N77 and N78 is disconnec-ted. When the temperature drops belowapprox. 48°C (118°F), this power supply isreconnected.

21.5 Charge control

The internal battery is automatically chargedif an external power supply (mains power orexternal battery) is connected. The frontpanel LED Charge Int. Batt. indicates if theinternal battery is in charge mode. Duringcharge mode, one of the following threedifferent battery charge levels is used:

• Level 1 if the battery voltage level is below18 V. The battery is charged with 20 mA.This low battery voltage level may indicatea faulty battery, and the low chargecurrent is selected to prevent damagesdue to a faulty battery.

• Level 2 if the battery voltage level isbetween18 – 29 V. The battery is chargedwith up to 500 mA.

• Level 3 is a trickle charge level that willcharge the battery with up to 50 mA tokeep the voltage level at approx. 27 V.

The time to recharge a discharged batterycan be up to 8 hours.

22 Operating power

22.1 Internal battery

There are two 12 V sealed lead acidbatteries connected in series inside thepower section used as an internal 24 Vbattery for backup purposes. The batteriesare rated 12 V, approx. 1.9 Ah.

The internal battery voltage level can bedisplayed in the ”Alarm and Message”display on the front panel.

Service interval approx. 3 years forexchange of the internal batteries. Afterreplacement, allow the batteries to rechargebefore clinical use of the ventilator.

The lifetime of the internal batteries arereduced if the batteries are used frequentlyto supply the ventilator with operatingpower. The batteries should not berecharged more than approx. 130 times tokeep stated backup capacity.

22.2 External battery inlet

The external battery inlet is a three-pin maleconnector at the power section panel. Theexternal battery inlet is rated 24 V. Whenconnected, the voltage of the externalbattery must be within approx. 23 – 30 V.


The external battery will not be charged bythe mains power supply.

The external battery voltage level can bedisplayed in the Alarm and Message displayon the front panel.



2

22.3 Operating time meter

The operating time meter on the powersection panel is supplied with +5 V. Thismeans that the operating time meter will beactivated as long as the DC/DC CONVERTER isenabled, i.e. when the mode selector is setto any other mode than Ventilator Off.

22.4 Grounding terminal

The grounding terminal is a potentialequalization pin at the power section panel.All internal grounds as well as protectionground in the mains power inlet areconnected to this grounding terminal.

23 Interconnection cable

The INTERCONNECTION CABLE is the 2.95 m long89 leads cable that connects the Control unitwith the Patient unit.


3

Servo Ventilator 300/300A Disassembling and assembling


3. Disassembling andassembling

General .................................................... 82

Preparations ............................................ 82

Handling PC boards ................................. 83

Microprocessor module PC 1588 ............ 84

Exchanging PROMs ................................ 85

Separating the panel sectionfrom the control section .......................... 86

Disassembling the panel section ............. 86

Assembling the panel section ................. 88

Disassembling the control section .......... 90

Assembling the control section ............... 92

Assembling the panel sectionto the control section .............................. 92

Separating the pneumatic sectionfrom the power section ........................... 93

Disassembling the power section ........... 94

Assembling the power section ................ 96

Assembling the pneumatic sectionto the power section ............................... 97

Disassembling the pneumatic section ..... 98

Assembling the pneumatic section ........ 101

Removing the interconnection cable ...... 102

Mounting the interconnection cable ....... 102

3


Disassembling and assembling Servo Ventilator 300/300A

Preparations

Before disassembling or assembling theServo Ventilator 300, make sure that:

• Gas supply is disconnected

• Mains power cable is disconnected

• Mode selector is set to Ventilator off.If the mode selector is set in any otherposition, the internal battery willsupply power to the PC boards

• All gas conveying parts are cleanedaccording to instructions in theOperating Manual.

After any service intervention in theServo Ventilator 300, perform a Functioncheck according to instructions in theOperating Manual.

General

The different main units and sub-units ofthe Servo Ventilator 300 are described inchapter Introduction. This information canbe useful also when disassembling andassembling the Servo Ventilator 300.

Disassembling and assembling of theinspiratory and expiratory channels and ofthe inspiratory valve units is described in theOperating Manual, chapter Cleaning.A further disassembling and assembling ofthe ventilator is described in this chapter.

The illustrations in the Siemens-Elemacatalog "Spare and exchange parts"(Order No. 90 34 570 E323E) are very usefulas a guide when disassembling andassembling the Servo Ventilator 300.

Service equipment (tools, calibration andtest equipment) can also be found in thecatalog stated above.

3



Handling PC boards

The PC boards contain components that arehighly sensitive to static electricity.

Those who come into contact with circuitboards containing sensitive componentsmust take certain precautions to avoiddamaging the components (ESD protection).

When working with ESD sensitive compo-nents, always use a grounded wrist bandand grounded work surface. Adequateservice tools must also be used.

PC boards (spare or exchange parts) mustalways be kept in protective packaging forsensitive electronic device.

PC boards must not be inserted or removedwhile the mains power or battery power isapplied to the PC boards.

Remove and insert the PC boards verycarefully to avoid damage to the connectors.

3



Microprocessor modulePC 1588

Each one of the five PC boards PC 1605,PC 1608, PC 1614, PC 1615 and PC 1616includes a microprocessor module. Thismicroprocessor module, PC1588 (1), ismounted with its two rows of connectorsinto the corresponding connectors on thePC boards mentioned above.

PC 1588 is secured to its corresponding PCboard with one of the following methods:

– On older units; strips of glue on theconnector sides or adhesive tape (2).

– On newer units; screw (3).

Removing PC 1588

• Remove the securing device (see above).Remove any remaining glue strips on theconnector sides

• Carefully lift off PC 1588 from the PCboard where it is mounted. Do notdamage the connector pins on PC 1588.

Assembling PC 1588

• Check that no connector pin on PC 1588is damaged.

• Carefully mount PC 1588 onto thecorresponding PC board and make surethat all connector pins fit in the connectorsocket.

• Secure the PC boards to each other:

– On older units; non-conductive adhesivetape (2). Do not use glue.

– On newer units; screw (3).

xxxxxx

1

2

3

300-

A24

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3



Exchanging PROMs

On each of the PC-boards PC 1587 andPC 1588, there are exchangable programmemory modules, PROMs.

The PROMs are denominated and labelledas follows:

– COM-PROM (PC 1587). Divided into twoPROM chips

– REF-PROM (PC 1588 on PC 1605)

– MON-PROM (PC 1588 on PC 1608)

– PAN-PROM (PC 1588 on PC 1614)

– LIN-PROM (PC 1588 on PC 1615)

– MIX-PROM (PC 1588 on PC 1616).

A label showing all PROM-versions includedin the ventilator is attached to the controlsection. When replacing a PROM chip,attach the new label (delivered with thePROM) onto the old label on the controlsection.

Note – Before exchanging COM-PROMs,always disconnect the power supply fromthe battery on PC 1587 COMPUTER INTERFACE.See information regarding power supplydisconnection in chapter ”4. Serviceprocedures”, section ”Resetting the trenddata memory and real time clock”.

300-

E06

X

1xxxxxxxxxxxx

When removing a PROM chip from thePROM socket, always use a PROMextraction tool (1), Order No. 62 04 353E380E. Do not try to pull the PROM chip outof its socket. Squeeze the pliers and let thetool action pull it out.

Some PC boards have been equipped withPROM socket from a different manufacturer(AMP). The PROM extraction tool statedabove do not fit these sockets. For AMPsockets, use the extraction tool, Order No.20 11 109 E500U, or a PROM extraction toolobtained through your local AMP dealer. Forfurther information, see EM Express ”PLCCSurface Mount Sockets” dated 1996-05-21.

3



Disassembling the panelsection

Front panel controls

• Separate the panel section from thecontrol section as previously described.

• Remove the knob cover (1).

• Remove the pin (2) if the control has apush-button release function.

• Loosen the nut (3) holding the knob andlift off the knob from the control shaft.Use the knob holder tool, Order No.62 04 197 E380E, when removing thecontrol knob.

• Disconnect the connector (4).

• Remove the two screws (5) and lift off thecontrol.

3

4

5

2

1

300-

A27

X

Separating the panel sectionfrom the control section

• Remove the four screws (1).

• Carefully lift off the panel section (2).

The panel section is now separated fromthe control section (3).

3

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Front panel controls

• Mount the control (1) on the front panelbase plate and connect the connector (2)to the PC board.

• On older units: Check that there is an O-ring (3) mounted on the knob.On newer units: The knob pointer ring ismade of a flexible rubber material thatreplaces the function of the O-ring.The O-ring is not used.

• Put the knob on the control shaft.

• Adjust the knob so that the knob pointer(4) aligns with the indication mark (5). Theindication mark is a small dot or a thinguide line.

• Tighten the nut (6) slightly.

• Check that the knob pointer still alignswith the indication mark.

2

1

300-

A30

X

Assembling the panelsection

The procedure for assembling the panelsection is the reverse of the disassemblyprocedure previously performed.

The following points must be noted duringassembling:

Panel interface board PC 1614

• Carefully mount PC 1614 on the frontpanel base plate. Make sure that the PCboards indicator LEDs and touch sensorsfit into the corresponding holes in the frontpanel base plate.

0.2 mm

3

45

6

7

8

9

300-

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3



There are three spring-loaded controls onthe front panel:

– Oxygen breaths / Start breath

– Reset / 2 min

– Pause hold Insp. / Exp.

These controls do not have the thin guideline mentioned above.

Mount the control knob with its pointerwings in horizontal position as shown in theillustration.

300-

A32

X

• Tighten the nut (6). Tighten to approx.:

– 150 Ncm on the mode selector knob

– 90 Ncm on all other knobs.

Use the knob holder tool, Order No.62 04 197 E380E, when mounting thecontrol knob.

• Check that the knob is easy to turn. If theknob is hard to turn, it can be necessary toput a 0.2 mm thickness gauge (7) betweenthe front panel film and the knob whilemounting the knob. The thickness gaugeOrder No. is 61 50 895 E380E.

• Mount the pin (8) and the knob cover (9).

3



Disassembling the controlsection

PC boards PC 1587, PC 1605,PC 1608 and PC 1616

• Remove the screws (1) and lift off thecontrol section lid (2).

• To remove any of the boards PC 1605 (3),PC 1608 (4) or PC 1616 (5), grasp thePC board and pull it out.

• To remove PC 1587 (6), first removePC 1608 as mentioned above. WhenPC 1608 is removed, grasp PC 1587 andpull it out.

Note – Before exchanging COM-PROMson PC 1587, always disconnect the powersupply from the battery on PC 1587.See information regarding power supplydisconnection in chapter ”4. Serviceprocedures”, section ”Resetting the trenddata memory and real time clock”.

64

53

2

1

300-

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3



Control interconnection boardPC 1617

• Separate the panel section from thecontrol section as previously described.

• Remove PC boards PC 1587, PC 1605,PC 1608 and PC 1616 as previouslydescribed.

• Disconnect the two interconnection cableconnectors (1) from the control unit.See section ”Removing the inter-connection cable”.

• Disconnect the loudspeaker connector (2).

• Remove the screws (3) and lift offPC 1617 (4).

3

4

2

1

300-

A34

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3



Assembling the controlsection

The procedure for assembling the controlsection is the reverse of the disassemblyprocedure previously performed.


PC boards

• The PC boards are mounted in differenttypes of guides. Make sure that thePC boards are correctly supported bythese guides.

• The PC board connectors on the controlinterconnection board PC 1617 are notsymmetrically mounted. The connectorscan be damaged if a PC board is mountedin wrong position.

Assembling the panelsection to the control section

The procedure for assembling the panelsection to the control section is the reverseof the separating procedure previouslyperformed.

3



Separating the pneumaticsection from the powersection

• Place the patient unit on the edge of theworkbench so the screws are accessiblefrom below.

• Loosen the four screws (1).

• Lift off the pneumatic section from thepower section. Place the pneumaticsection on a support beside the powersection.

• Disconnect the battery connector (2).

To reduce the risk of damages, causedby short-circuits in the power section,always have the batteries disconnectedwhen the power section is open.

• Instead of cutting the cable ties, removethe screw (3) holding the batterybracket (4).

• Disconnect the connectors (5, 6 and 7).

The pneumatic section is now separatedfrom the power section.

1

5

6

7

3

4

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2

3



Disassembling the powersection

Mains power inlet

• Separate the pneumatic section from thepower section as previously described.

• Remove the cover (1).On older units: A small plastic covermounted with two screws (2).On newer units: A big metal cover (asillustrated) mounted with three screws (3).An EMI-filter is attached to the cover witha cable tie. Cut the cable tie if the covermust be completely removed from thepower section.

• Disconnect the cables from the mainspower inlet.

• Remove the mains power inlet (4) fromthe power section.

Transformer


• Remove the cover (1) from the mainspower inlet as previously described.

• Disconnect the transformer cables fromthe mains power inlet.

• Disconnect the transformer cables fromthe capacitor (2) and from the screwterminal (3).

• Remove the nut (4), washer (5) and rubberplate (6).

• Lift off the transformer (7).

3 4

5

6

7

1

2

300-A37X

3

4

1

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2

3



Power supply board PC 1618


• Remove the cover (1) from the mainspower inlet.

• Remove the four screws (2).

• Disconnect the;

– Cables at screw terminal (3).

– Ground cable (4). This ground cable isused only in older versions. It has beenremoved in newer versions.

– External battery inlet connector (5).

– Operating time meter connector (6).

• Remove the nuts holding the diodes (7)and release the diodes from the screws.

• Remove the nuts and screws holding thetwo auxiliary equipment outputs (8).

• Remove the screw (9).

• Remove the capacitor holder (10).

• Carefully lift off the PC 1618.2

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2

3

4

56 7 8

9

10

1

3



Assembling the powersection

The procedure for assembling the powersection is the reverse of the disassemblyprocedure previously described.


Mains power inlet

• Connect the cables to the mains powerinlet according to figure.

1 2 3 4

RD WH BK GN300-

A40

X

Power supply board PC 1618

• Connect cables to screw terminalaccording to figure.

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300-

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A C E

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3



Battery pole covers

• Make sure that the battery pole coversare mounted on the battery polesaccording to figure.

Assembling the pneumaticsection to the power section

The procedure for assembling thepneumatic section to the power section isthe reverse of the separating procedurepreviously performed.

300-

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Disassembling the pneumaticsection

Inspiratory valves (gas modules)

• Remove the screw (1).

• Push down the safety catch (2).

• Pull out the inspiratory valve (3).

• If the inspiratory valve unit – Optional (4)is replaced with units for SUN 345 or NOgas administration, these units must alsobe removed.

The inspiratory valves are factorycalibrated. They must not be disassem-bled further than described in theOperating Manual, chapter ”3000 hoursoverhaul with complete cleaning”.

Pneumatic section casing

• Remove the inspiratory and expiratorychannels as described in the OperatingManual, chapter ”3000-hours overhaulwith complete cleaning”.

• Remove the plastic cover (1). This cover isnot included in newer units.

• Pull out and turn the locking pins (2) fromthe locked position.

• Lift the casing (3) carefully until the fanconnector (4) is accessible.

• Disconnect the fan connector (4).

• Lift off the casing (3).

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3

2

4

1

2

31

4

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Cover plate

• Remove the inspiratory valves for AIR andO2 as previously described.

• Remove the pneumatic section casing aspreviously described.

• Disconnect the flow transducer cable (1).

• Disconnect the O2 cell cable (2).

• Remove the three screws (3).

• Carefully lift off the cover plate (4).

Expiratory valve

• Remove the cover plate as previouslydescribed.

• Disconnect the two expiratory valveconnectors (1 and 2).

• Remove the three screws (3).

• Lift off the expiratory valve (4).

2

1 4

3

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0-A

43X

4

31

2

3



Pneumatic interconnection boardPC 1607


• Remove the cover plate as previouslydescribed.

• If an inspiratory valve – Optional (1) ismounted, loosen the screw (2) andremove the valve dummy.

• Remove:

– PC 1615 (3).

– PC 1622 (4).

– PC 1611 – Exp. (5).

– PC 1611 – Insp. (6).

If the pressure in a pressure transduceris raised abnormally, the transducer canbe damaged. When handling the twopressure amplifier boards PC 1611,never raise the pressure in the transdu-cers by covering the hole or squeezingthe silicon rubber connection piece.

• Disconnect:

– Interconnection cable connectors (7 – 8).

– Power supply cable connectors (9 – 10).

– Safety valve connectors (11 – 12).

– Expiratory valve connectors (13 – 14).

• Remove the nine nuts (15).

• Remove the two screws (16).

• Carefully lift off PC 1607 (17).

34

5

6

1

2

10

13 1417

16

11

9

7

8

15

15

12

300-

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3



Assembling the pneumaticsection

The procedure for assembling thepneumatic section is the reverse of thedisassembly procedure previouslyperformed.


Cover plate

• The silicon rubber connection pieces forthe two pressure transducers must fit intothe bacteria filter holders (1 and 2) on thecover plate.

• The cover plate is equipped with a guidefor PC 1622. Make sure that the PC boardis supported by this guide (4).

• Make sure that all 8 ground springs (3) arein correct position between the pneumaticsection and the power section when thesections are assembled.

4

2

3

1

2

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3

3

3



Removing the inter-connection cable

Patient unit connection

• Remove the pneumatic section casing aspreviously described.

• Disconnect the two interconnection cableconnectors (1).


• Slide out the cable clamp (3) from thepatient unit.

Mounting the inter-connection cable

The procedure for assembling the inter-connection cable to the ventilator is thereverse of the removing procedurepreviously performed.

Control unit connection

• Remove the two screws (1) and lift offthe cover (2).

• Disconnect the two interconnection cableconnectors (3).


• Slide out the cable clamp (5) from thecontrol unit.

4

5

1 2 3

300-

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13

2

300-

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4

Servo Ventilator 300/300A Service procedures


4. Service proceduresSelecting the language andbarometric pressure unit ....................... 104

Selecting the address code ................... 105

Selecting the voltage setting ................. 105

Replacing the fuses ............................... 106

Replacing the internal battery ................ 107

Replacing the battery onPC 1587 Computer Interface ................. 108

Resetting the trend data memoryand real time clock ................................ 108

4


Service procedures Servo Ventilator 300/300A

Selecting the language andbarometric pressure unit

The following selections are made with theswitch SW1 on PC 1608 MONITORING:

– The language of the text shown in the”Alarms and messages” display.

– The unit of the actual barometric pressureshown in the ”Alarms and messages”display.

PC 1608 must be removed from the controlunit to make SW1 accessible. See alsochapter ”3. Disassembling and assembling”for detailed disassembling and assemblinginstructions.

• Disconnect and prepare the ventilator asdescribed in chapter ”3. Disassemblingand assembling”, section ”Preparation”.

• Remove PC 1608 from the control unit.

Selecting the Alarms andmessages language

This illustration shows how the switches 1,2 and 3 should be set to select the differentavailable languages.

Switch settings not showed in thisillustration will normally give englishlanguage.

Selecting the barometric pressureunit

This illustration shows how the switch 4should be set to select mmHg or mbar.

The actual barometric pressure is showed inthe ”Alarms and messages” display whenthe touch pads ”Airway pressure” and”Technical” are touched simulaneouslythree times.

1 2 3 4

OPEN

1 2 3 4

OPEN

mbar mmHg

300-

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1 2 3 4

OPEN

1 2 3 4

OPEN

OPEN OPEN

OPEN OPEN

1 2 3 4 1 2 3 4

1 2 3 4 1 2 3 4

English Spanish

German Italian

French Swedish

300-

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4



Selecting the address code

The ventilators address code is selectedwith two switches SW1 and SW2 onPC 1587 COMPUTER INTERFACE.

The switches are located above SERIALCOMMUNICATION PORT 1 and they are accessiblewhen the upper cover is opened.

The address code (device No.) can beselected between 00 and 99. The lowerswitch (SW2) sets the first digit and theupper switch (SW1) sets the second digit.The address code selected in the illustrationis 10.

Selecting the voltage setting

• Disconnect the mains power cable fromthe ventilator.

• Open the cover (1).

• Remove the drum (2), turn the drum to theselected voltage and put it back in thisnew position.

Mains power voltage Selector setting

100 V (±10%) 100 V

120 V (±10%) 120 V

220 V (±10%) 220 V

230 V (±10%) 220 V (see note below)

240 V (±10%) 240 V

• Check that the fuses (F11 and F12) corres-ponds with the selected mains powervoltage (see section ”Replacing thefuses” in this chapter).

• Close the cover (1). The selected voltageis shown in the cover window.

Note – In many countries where the nominalmains power voltage is 230 V, the actualvoltage is found to vary within a highervoltage range than specified for the selectorsetting 220 V. In such case, the selectorsetting for 240 V is recommended.

2

1

F11

F12

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2

1 0 9

87

65

4

32

1 0 9

87

6

300-

A51

X

5

4



Replacing the fuses

Fuses F1, F2, F3 and F4

Fuses F1 – F4 are mounted on PC 1618POWER SUPPLY inside the power section.


• Disassemble the power section asdescribed in chapter ”3. Disassemblingand assembling”, section ”Disassemblingthe power section”.

• Replace blown fuses with new fuses aslisted in the table below:

Fuses Purpose

F1: F 6.3 A Limits the total +24 V supply current

F2: F 1.6 A Controls the +24 V FUSED voltage

F3: F 6.3 A Internal battery connector fuse

F4: F 6.3 A External battery connector fuse

• Assemble the power section.

Fuses F11 and F12

• Disconnect the mains power cable fromthe ventilator.

• Open the cover (1).

• Pull out the fuse holders (2).

• Replace blown fuses with new fuses aslisted in the table below:

Mains power Selector Fuses

voltage setting F11/F12

100 V (±10%) 100 V T 3.15 AL

120 V (±10%) 120 V T 3.15 AL

220 V (±10%) 220 V T 1.6 AL

230 V (±10%) 220 V T 1.6 AL

240 V (±10%) 240 V T 1.6 AL

• Close the cover (1). The selected voltageis shown in the cover window.

1

F11

F12

300-

L28X

2

4



Replacing the internalbattery

Normal service interval for exchange of theinternal batteries is approx. 3 years.

The lifetime of the internal batteries arereduced if the batteries are used frequentlyto supply the ventilator with operating power.The batteries should not be recharged morethan approx. 130 times to keep statedbackup capacity.

The internal battery voltage level can bedisplayed in the ”Alarm and Message”display on the front panel.

Replacing the batteries

See also chapter ”3. Disassembling andassembling” for detailed disassembling andassembling instructions.


• Lift off the pneumatic section from thepower section.

• Remove the battery bracket.

• Replace the batteries. Both batteries mustbe replaced at the same time.

• Mount the battery bracket.

• Mount the battery pole covers.

• Assemble the pneumatic section to thepower section.

After replacement, allow the batteries torecharge before clinical use of the ventilator.

Pb

Old non-functioning batteries must bereturned to the place of purchase or toa place where they can be disposed ofproperly. Batteries must not bedisposed of with ordinary waste.

4



Resetting the trend datamemory and real time clock

The trend data memory and the real timeclock in the SV 300 is used by e.g. a ServoScreen 390 connected to the SV 300.

Note – When resetting the memory, allinformation stored in the trend data memoryas well as time and date setting will be lost.

Resetting procedure



• Make the battery on the upper part ofPC 1587 accessible.

• Disconnect backup power supply toPC 1587 during at least 30 seconds by:

– Disconnecting the battery cable atbattery connector P1 or

– Removing the jumper J1 located closeto the battery connector.

Both methods have the same effect.

• Connect the battery or jumper.

• Assemble the control unit.

• Connect mains power and gas supply tothe ventilator.

• Set the Mode selector to ”Volume Control”(”Volume Control/Support” on SV 300A).

• Wait approx. 30 seconds and make surethat no ”Technical error” information isshown in the ”Alarm and messages”display.

• Set time and date using e.g. a Servo Screen390 connected to the port N82 on SV 300.

Replacing the battery onPC 1587 Computer Interface

Normal service interval for exchange of thebattery is approx. 5 years.

The battery backs up the trend data memoryand the real time clock when the SV 300 isswitched off.Note – When the battery is disconnected,all information stored in the trend datamemory as well as time and date settingwill be lost.

Replacing the battery



• Remove PC 1587 from the control unit.

• Replace the battery on PC 1587. Attachthe new battery to the PC board with acable tie.

• Assemble the control unit.

• Connect mains power and gas supply tothe ventilator.

• Set the Mode selector to ”Volume Control”(”Volume Control/Support” on SV 300A).

• Wait approx. 30 seconds and make surethat no ”Technical error” information isshown in the ”Alarm and messages”display.

• If the real time clock in SV 300 is used, settime and date. This can only be done byusing e.g. a Servo Screen 390 connectedto the port N82 on SV 300.

Siemens Siemens

5

Servo Ventilator 300/300A Troubleshooting


5. TroubleshootingTroubleshooting table ............................ 110

5


Troubleshooting Servo Ventilator 300/300A

Before starting troubleshooting, try toeliminate all possibilities of operationalerrors. If the malfunction remains, use thetroubleshooting table below as well as theinformation in chapter ”2. Description offunctions” to locate the faulty part. Performactions step by step and check that themalfunction is eliminated.

When the fault is corrected, carry out acomplete”Function check” as described inthe Operating Manual.

All possible ”Alarm and messages” textsand alarm conditions can be found in chapter”2. Description of functions”, section”4. Monitoring”.

The troubleshooting table below is focusedonly on alarm messages given for certaintechnical problems. Information about alarmmessages for clinical problems can be foundin the Operating Manual, chapter ”Patientsafety”.

txet”segassemdnasmralA” noitcA

TFPedocrorrelacinhceTTRATSER

simralA.MORP-NOMecalper/kcehCsirehgihro0.6VMORP-NOMfidetavitca

.rewolroD8061CPnodetnuom

.8061CPecalpeR

8161CPecalpeR 1.

MARedocrorrelacinhceTTRATSER

.8061CPno8851CPecalpeR

.8061CPecalpeR

8161CPecalpeR 1.

MORedocrorrelacinhceTTRATSER


.8061CPecalpeR

8161CPecalpeR 1.

UPCedocrorrelacinhceTTRATSER


8161CPecalpeR 1.

edocrorrelacinhceT µ naPPTRATSER/LAUNAMGNITAREPOEES


.MORP-NAPecalpeR

.4161CPecalpeR

8161CPecalpeR 1.

edocrorrelacinhceT µ MCSPTRATSER/LAUNAMGNITAREPOEES

.7851CPecalpeR

.MORP-MOCecalpeR

8161CPecalpeR 1.

5

Servo Ventilator 300/300A Troubleshooting


1 Multiple monitoring and uP errors can be an indication of power supply error.

txet”segassemdnasmralA” noitcA

edocrorrelacinhceT µ T&RPTRATSER/LAUNAMGNITAREPOEES


.MORP-FERecalpeR

.5061CPecalpeR

8161CPecalpeR 1.

edocrorrelacinhceT µ xiMPTRATSER/LAUNAMGNITAREPOEES


.MORP-XIMecalpeR

.6161CPecalpeR

8161CPecalpeR 1.

edocrorrelacinhceT µ pxEPTRATSER/LAUNAMGNITAREPOEES


.MORP-NILecalpeR

.5161CPecalpeR

8161CPecalpeR 1.

RwSedocrorrelacinhceTLAUNAMGNITAREPOEES

.rotcelesegnartneitaPecalpeR

MwSedocrorrelacinhceTLAUNAMGNITAREPOEES

.rotcelesedoMecalpeR

CoPedocrorrelacinhceTLAUNAMGNITAREPOEES

.retemoitnetopVMCecalpeR

OoPedocrorrelacinhceTLAUNAMGNITAREPOEES

OecalpeR 2 .retemoitnetopnoitartnecnoc

aBedocrorrelacinhceTLAUNAMGNITAREPOEES

.8061CPecalpeR

FPedocrorrelacinhceTLAUNAMGNITAREPOEES

.8161CPecalpeR

.8061CPecalpeR

SGNIBUTKCEHC .retlifairetcaBerusserpyrotaripxeecalpeR

.recudsnarterusserPyrotaripxeecalpeR

erusserpsuounitnochgiH .2261CPecalpeR

.dionelosyrotaripxEecalpeR

.)tinueno(6851CP+5851CPecalpeR

5


Troubleshooting Servo Ventilator 300/300A

Notes

6

Servo Ventilator 300/300A Product change history


6. Product change historyPROM, PC board andOperating Manual versions.................... 114

6


Product change history Servo Ventilator 300/300A

PROM, PC board andOperating Manual versions

Due to upgrades performed on deliveredventilators, the PROM, PC board andOperating Manual versions as listed belowshould be used with the Servo Ventilator300/300A.

The list is valid August 1997. Possible futureupgrades and product evaluations maychange the configuration of the ventilator,i.e. PROMs, PC boards and OperatingManuals with higher version numbers arepossible.

PROMs, PC boards and Operating Manualswith lower version numbers than stated inthe list should not be used.

The difference between the OperatingManual versions can briefly be describedas follows:

Version 7.X – Describes the functions ofServo Ventilator 300 with Failure AlarmBox (FAB).

Version 8.X – Describes the functions ofServo Ventilator 300 without Failure AlarmBox (FAB) and the FAB-functionsincorporated on PC 1608E.

Version 9.X – Describes the functions ofServo Ventilator 300A. Must be used onventilators with Automode.

Mandatory and optional upgrades:

Upgrade 1995-09 (USA) – Mandatory.

Upgrade 1995-10 (Rest of World) –Mandatory.

Alarm system enhancement kit 96-05 –Optional.

Automode upgrade – Optional.

MORP draobCP launaMgnitarepO decudortnI

10.2VMORP-MOC D7851CP X.9,X.8,X.7noisreV 01-5991/90-5991edargpU.5991

30.1VMORP-NIL E-A5161CP

F5161CP

X.8,X.7noisreV

X.9,X.8,X.7noisreV

01-5991/90-5991edargpU.5991

edomotuA.6991

20.4VMORP-XIM

40.4VMORP-XIM

B-A6161CP

)50ver(B6161CP

X.9,X.8,X.7noisreV

)ON+(X.9,X.8noisreV

01-5991/90-5991edargpU.5991

ON.7991

10.5VMORP-NOM

00.6VMORP-NOM

10.6VMORP-NOM

20.6VMORP-NOM

E-A8061CP

E8061CP

E8061CP

)41.ver(E8061CP

X.7noisreV

X.8noisreV

X.9,X.8noisreV

)ON+(X.9,X.8noisreV

01-5991/90-5991edargpU.5991

50-69tik.nahnEmetsysmralA.6991

edomotuA.6991

ON.7991

40.4VMORP-NAP

50.4VMORP-NAP

80.4VMORP-NAP

F-A4161CP

F-A4161CP

F-A4161CP

X.8,X.7noisreV

X.9,X.8,X.7noisreV

)ON+(X.9,X.8noisreV

01-5991/90-5991edargpU.5991

edomotuA.6991

ON.7991

10.1VMORP-FER

20.2VMORP-FER

E-A5061CP

E-A5061CP

X.8,X.7noisreV

X.9,X.8,X.7noisreV

01-5991/90-5991edargpU.5991

edomotuA.6991

7

Servo Ventilator 300/300A Index


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Functions Included in PC board

7. IndexAlphabetic index .................................... 116

7


Index Servo Ventilator 300/300A

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AA/D, D/A Computer interface PC 1587 – 31 – – –Address code Computer interface PC 1587 – – – 105 –Air inlet Inspiratory valve unit – Air – – 62 – – –Air inlet with dust filter Cooling system – – 76 – – –Airway pressure Front panel – – 26 – – –Alarms and messages Front panel – – 27 – 104 –Analog I/O terminal Computer interface PC 1587 – 31 90 – –Analog input & Digital code port Computer interface PC 1587 – 32 – – –Automode function Reference & Timing PC 1605 – 58 – – 114Automode front panel Front panel – – 27 87 – –Automode panel interface Panel interface PC 1745 9 29 – – –Auxiliary outputs Power supply PC 1618 11 77 95 – –

BBackup alarm system Monitoring PC 1608 – 45 – – –Bacteria filter (Exp.) Expiratory pressure – – 71 – – –Bacteria filter (Insp.) Inspiratory pressure – – 70 – – –Bacteria filter (Insp. valve) Inspiratory valve unit – Air – – 62 – – –Barometer pressure transducer Monitoring PC 1608 – 48 – – –Barometric pressure unit – – – – – 104 –Basic principles – – 12 – – – –Battery Computer interface PC 1587 – 31 – 108 –Beeper Monitoring PC 1608 – 48 – – –

CCapacitor Mains power – 11 76 95 – –Charge control Power supply PC 1618 – 79 – – –Compensation ±5% Inspiratory valve unit – Air PC 1600 – 65 – – –Computer interface – PC 1587 10 30 90 108 114Computer interface dummy – PC 1665 10 33 90 – –Control interconnection Control unit PC 1617 9 – 91 – –Control section Control unit – 9 30 90 – –Control unit – – 9 25 86 – –Cooling fan Cooling system – – 76 – – –Cooling system Patient unit – – 76 – – –Current control (Exp.) Expiratory valve PC 1585 11 74 – – –Current control (Insp.) Inspiratory valve unit – Air PC 1585 – 65 – – –Current power (Exp.) Expiratory valve PC 1586 11 74 – – –Current power (Insp.) Inspiratory valve unit – Air PC 1586 – 65 – – –

7



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DDelta pressure amplifier Inspiratory valve unit – Air PC 1602 – 64 – – –Delta pressure transducer and net Inspiratory valve unit – Air – – 63 – – –

EEnd inspiration indicator Reference & Timing PC 1605 – 60 – – –Expiratory channel – – 10 71 – – –Expiratory connection tube Expiratory channel – – 71 – – –Expiratory flow linearization – PC 1615 11 75 – – 114Expiratory flow amplifier Expiratory channel PC 1623 – 72 – – –Expiratory flow linearizer Expiratory flow linearization PC 1615 – 75 – – –Expiratory flow transducer Expiratory channel – – 71 – – –Expiratory inlet with moisture trap Expiratory channel – – 71 – – –Expiratory outlet withnon return valve Expiratory channel – – 72 – – –Expiratory pressure Pneumatic section – – 71 – – –Expiratory solenoid withposition sensor Expiratory valve – – 71 99 – –Expiratory valve tube Expiratory channel – – 72 – – –Expiratory valve – – 11 74 99 – –External battery inlet Operating power – 11 79 95 – –

FFailure alarm box Monitoring – – 48 – – 114Flow calculator Inspiratory valve unit – Air PC 1602 – 65 – – –Flow filters & Integrators Monitoring PC 1608 – 45 – – –Flow I control Inspiratory valve unit – Air PC 1600 – 65 – – –Flow PI control Inspiratory valve unit – Air PC 1601 – 65 – – –Front panel – – – 25 87 – –Fuses – – – – – 106 –

GGas composition compensation Expiratory flow linearization PC 1615 – 75 – – –Grounding terminal Operating power – – 80 – – –

II/O buffers Computer interface PC 1587 – 31 – – –I/O Reference & Timing PC 1605 – 60 – – –Inputs (Insp. control) Inspiratory control PC 1616 – 61 – – –Inputs (Panel interface) Panel interface PC 1614 – 28 – – –

7



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Inputs interface & A/D Monitoring PC 1608 – 45 – – –Inspiratory channel – – 10 68 – – –Inspiratory control – PC 1616 10 61 90 – 114Inspiratory mixing part Inspiratory channel – – 68 – – –Inspiratory pipe Inspiratory channel – – 68 – – –Inspiratory pressure – – – 70 – – –Inspiratory solenoidwith position sensor Inspiratory valve unit – Air – – 63 – – –Inspiratory valve key Inspiratory valve unit – Air – – 63 – – –Inspiratory valvetemperature sensor Inspiratory valve unit – Air PC 1637 – 63 – – –Inspiratory valve unit – Air – – 10 62 98 – –Inspiratory valve unit – O

2– – 10 67 98 – –

Inspiratory valve unit – Optional – – 10 67 98 – –Interconnection cable – – 8 80 102 – –Internal battery Operating power – 11 79 93 107 –

LLED array Panel interface PC 1614 – 28 – – –LED indicators Computer interface PC 1587 – 32 – – –LED matrix Panel interface PC 1614 – 28 – – –Linearizing CPU includingLIN-PROM functions Expiratory flow linearization PC 1615 – 75 85 – 114Loudspeaker Monitoring PC 1608 – 48 91 – –

MMains power inlet Mains power – 11 76 95 – –Mains power – – – 76 – – –Master/Slave connection Computer interface PC 1587 – 31 – – –Microprocessor CPU includingCOM-PROM functions Computer interface PC 1587 – 31 85 – 114Microprocessor module – PC 1588 – 23 84 – –Mixer Inspiratory control PC 1616 – 61 – – –Mixer CPU includingMIX-PROM functions Inspiratory control PC 1616 – 61 85 – 114Mode CPU includingREF-PROM functions Reference & Timing PC 1605 – 49 85 – 114Mode select Panel interface PC 1614 – 28 – – –Mode selection Front panel – – 27 – – –

7



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Monitor/Alarm CPU includingMON-PROM functions Monitoring PC 1608 – 34 85 – 114Monitoring – PC 1608 10 34 90 – 114Monitor display Panel interface PC 1614 – 29 – – –

NNozzle unit Inspiratory valve unit – Air – – 63 – – –

OO2 cell Inspiratory channel – 10 68 – – –

O2 concentration amplifier Valve control PC 1622 – 73 – – –

O2 concentration Front panel – – 27 – – –

O2 inlet Inspiratory valve unit – O

2– – 67 – – –

Operating power – – – 79 – – –Operating time meter Operating power – 11 80 94 – –Optional interface – – – 74 – – –Optional PC board slot – – – 48 – – –Opto switch Panel interface PC 1614 – 29 – – –

PPanel interface – PC 1614 9 28 87 – 114Panel section Control unit – 9 25 86 – –Panel CPU includingPAN-PROM functions Panel interface PC 1614 – 28 85 – 114Panel display Panel interface PC 1614 – 28 – – –Parameter buffers Panel interface PC 1614 – 28 – – –Patient range selection Front panel – – 25 – – –Patient trigger Reference & Timing PC 1605 – 59 – – –Patient unit – – 10 62 93 – –Pause hold Front panel – – 27 – – –PEEP PID control Valve control PC 1622 – 73 – – –Pneumatic interconnection Patient unit PC 1607 11 – 100 – –Pneumatic section Patient unit – 10 62 98 – –Position PD control (Exp.) Valve control PC 1622 – 73 – – –Position PD control (Insp.) Inspiratory valve unit – Air PC 1601 – 65 – – –Power section Patient unit – 11 76 94 – –Power supply – PC 1618 11 77 95 – –Power temperature control Power supply PC 1618 – 79 – – –Pressure amplifier (Exp.) Expiratory pressure PC 1611 11 71 – – –Pressure amplifier (Insp.) Inspiratory pressure PC 1611 11 70 – – –

7



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Pressure amplifier (Insp. valve) Inspiratory valve unit – Air PC 1601 – 64 – – –Pressure calculator Inspiratory valve unit – Air PC 1601 – 64 – – –Pressure PID control Reference & Timing PC 1605 – 60 – – –Pressure transducer (Exp.) Expiratory pressure PC 1611 – 71 – – –Pressure transducer (Insp.) Inspiratory pressure PC 1611 – 70 – – –

RReference & Timing – PC 1605 10 49 90 – 114Respiratory pattern Front panel – – 26 – – –

SSafety valve driver Inspiratory channel PC 1613 – 69 – – –Safety valve Inspiratory channel – 11 69 – – –Serial communication ports Computer interface PC 1587 – 32 – – –Sound & Alarm control Monitoring PC 1608 – 45 – – –Supply pressure amplifier Inspiratory valve unit – Air PC 1602 – 64 – – –Supply pressure transducer Inspiratory valve unit – Air – – 63 – – –

TTransducer temperature control Expiratory flow linearization PC 1615 – 75 – – –Transformer Mains power – 11 76 95 – –

VValve code transponder Inspiratory valve unit – Air PC 1600 – 63 – – –Valve control – PC 1622 11 73 – – –Valve enabling Valve control PC 1622 – 73 – – –Valve position calculator Inspiratory valve unit – Air PC 1603 – 65 – – –Valve zeroing Valve control PC 1622 – 73 – – –Version labels – – – 24 – – –Voltage control & Timing Power supply PC 1618 – 78 – – –Voltage distribution Power supply PC 1618 – 78 – – –Voltage setting – – – – – 105 –Volume Front panel – – 26 – – –

ZZero offset (Exp.) Expiratory flow linearization PC 1615 – 75 – – –Zero offset (Insp.) Inspiratory valve unit – Air PC 1602 – 64 – – –

8

Servo Ventilator 300/300A Diagrams


8. DiagramsExternal battery inlet P67 ...................... 122

Auxiliary output N77 .............................. 122

Auxiliary output N78 .............................. 123

Master/Slave connection N80 ............... 123

Analog I/O terminal N81 ........................ 124

Serial communication ports N82 and N83 125

Analog input & Digital code port N84 .... 125

Interconnection cable ............................ 126

Functional block diagram ....................... 127

Only accessories, supplies or auxiliaryequipment listed in Siemens-Elemacatalogs (”Products and accessories”Order No. 90 34 562 E323E and ”Spareand exchange parts” Order No. 90 34570 E323E) must be connected to orused in conjunction with the ventilator.

Warning: Use of accessories andauxiliary equipment other than thosespecified in these catalogs may degradesafety and performance of the ventilator.


Diagrams Servo Ventilator 300/300A

8

Auxiliary output N77

9-pole D-sub connector (N77). Mainly usedfor power supply to auxiliary equipment.Only Siemens connection cable must beused.

The illustration of the connector showoutside view.

If a signal has three different scale factorvalues, e. g. 3/3/18 V/l/s, the different valuesrefers to selected front panel setting Adult/Pediatric/Neonate.

300-

A22

X

5

9

1

6

N77

1 CGND2 +24 V PO (Power Out)3 Pow sup out 1 (not used, do not short-circuit)4 Pow sup out 2 (not used, do not short-circuit)5 CGND6 EXP TIME H BUFF2, 0 V; 5 V7 EXP PRESS BUFF2, 7.5 V/100 cm H

2O

8 AIRWAY FLOW BUFF2, 3/3/18 V/l/s9 ADULT RANGE L BUFF2, 0 V; 5 V

External battery inlet P67

3-pole Cannon AXR connector (P67). Can beused to connect an external battery to theServo Ventilator 300. Only Siemensconnection cable must be used.


1 NC2 +24 V (External battery pos.)3 0 V (External battery neg.)

P67

1 2

3300-

L25X

8



Master/Slave connection N80

15 pole D-sub connector (N80). Can be usedfor the synchronization of two ServoVentilator 300. Only Siemens connectioncable must be used.


Note – If a voltage is connected to any ofthe pin number marked * in the table below,the function of the ventilator can beinfluenced.

5

15

10

1

11

6

300-

A16

X

N80

1 –2* Slave start exp H, 0 V; 5 V, Input3* Slave mode L, 0 V; 5 V, Input4 Start exp buff H, 0 V; 5 V, Output5 Clock buff 1 H, 0 V; 5 V, Output6 –7* Slave start insp H, 0 V; 5 V, Input8* Slave clock H, 0 V; 5 V, Input9 Start insp buff H, 0 V; 5 V, Output10 Mode buff L, 0 V ; 5 V, Output11 GND, Input/Output reference12 Pat trig buff H, 0 V; 5 V, Output13* Master pat trig H, 0 V; 5 V, Input14 Mon dis insp valves master buff L, 0 V; 5 V, Output15* Mon dis insp valves slave L, 0 V; 5 V, Input

Auxiliary output N78

15-pole D-sub connector (N78). Mainly usedfor power supply to auxiliary equipment.Only Siemens connection cable must beused.


If a signal has three different scale factorvalues, e. g. 3/3/18 V/l/s, the different valuesrefers to selected front panel setting Adult/Pediatric/Neonate.

300-

A23

X

8

15

1

9

N78

1 +24 V PO (Power Out)2 +24 V PO (Power Out)3 Pow sup out 1 (not used, do not short-circuit)4 Pow sup out 2 (not used, do not short-circuit)5 CGND6 EXP TIME H BUFF2, 0 V; 5 V7 CGND8 CGND9 +24 V PO (Power Out)10 FAN CONTROL, Input11 Pow sup out 3 (not used, do not short-circuit)12 EXP PRESS BUFF2, 7.5 V/100 cm H

2O

13 AIRWAY FLOW BUFF2, 3/3/18 V/l/s14 ADULT RANGE L BUFF2, 0 V; 5 V15 CGND



8

Analog I/O terminal N81

62 pole D-sub connector (N81). Can be usedfor connection of monitoring/recordingequipment. Only Siemens connection cablemust be used.


If a signal has three different scale factorvalues, e. g. 3/18/45 V/l/s, the differentvalues refers to selected front panel settingAdult/Pediatric/Neonate.

Input control signals can be connected atN81 to control some ventilator functions(e.g. when using Bi-Phasic Ventilation).These input signals are routed via twosockets, J2 and J3, on PC 1587.

300-

A17

X

21

62

42

1

43

22

N81

1 Chassis GND2 V- limited; -15 V, max 200 mA, Output3 0 V (A), Input/Output reference4 V+ limited; +15 V, max 200 mA, Output5 –6* Ext press contr lev set in, 0 V – +5 V, Input7* Ext CMV freq set in, 0 V – +5 V, Input8* Ext SIMV freq set in, 0 V – +5 V, Input9* Ext insp time set in, 0 V – +5 V, Input10 Neb flow buff 3 18 45, 3/18/45 V/l/s, Output11 Air flow buff 3 18 45, 3/18/45 V/l/s, Output12 Insp flow buff 3 3 18, 3/3/18 V/l/s, Output13 Exp flow buff 3 3 18, 3/3/18 V/l/s, Output14 Insp press buff 50 mV, 50 mV/cm H

2O, Output

15 Exp press buff 50 mV, 50 mV/cm H2O, Output

16 Internal battery voltage lim, Output17 Insp time buff, 0V ; 5 V, Output18 Range sel D0 buff, 0V ; 5 V, Output19 Clock buff 2 H, 0V ; 5 V, Output20 Patient trig buff H, 0V ; 5 V, Output21 Serial data to slave buff H, 0V ; 5 V, Output22 GND, Input/Output reference23 +5V limited; max 500 mA, Output24 0V (24), Input/Output reference25 +24V limited; max 270 mA, Output26 –27* Ext press supp lev set in, 0 V – +5 V, Input28* Ext insp rise time set in, 0 V – +5 V, Input29* Ext preset min vol set in, 0 V – +5 V, Input30* Ext pause time set in, 0 V – +5 V, Input31* Ext CPAP flow set in, 0 V – +5 V, Input

To enable the control functions, jumpersmust be mounted in the sockets. The figurebelow, showing sockets J2 and J3, indicateswhich connectors that need to be short-circuited with a jumper to enable a controlsignal. (Signal No. as stated in the pinconfiguration list below.)

Note – If jumpers are mounted and avoltage is connected to any of the pinnumber marked * in the table below, thefunction of the ventilator can be influenced.

32 Airway flow buff 3 3 18, 3/3/18 V/l/s, Output33 Barometric press buff 4.0, 4.0 V/Bar, Output34 ET CO

2 conc buff 1.0, 1.0 V/%CO

2, Output

35 O2 flow buff 3 18 45, 3/18/45 V/l/s, Output

36 Insp flow patient buff 3 3 18, 3/3/18 V/l/s, Output37 CO

2 conc buff 1.0, 1.0 V/%CO

2, Output

38 Serial data to master test H, 0V ; 5 V, Output39 Range sel D1 buff, 0V ; 5 V, Output40 Power up reset buff L, 0V ; 5 V, Output41 Exp time buff, 0V ; 5 V, Output42 Alarm buff L, 0V ; 5 V, Output43 –44 –45 –46 –47* Ext O

2 conc set in, 0 V – +5 V, Input

48* Ext nebulizer time set in, 0 V – +5 V, Input49* Ext trigg sens set in, 0 V – +5 V, Input50* Ext PEEP lev set in, 0 V – +5 V, Input51 Exp flow patient buff 3 3 18, 3/3/18 V/l/s, Output52 O

2 conc buff 90 mV, 90 mV/%O

2, Output

53 Insp flow patient buff 7.2 7.2 43.2,7.2 /7.2/43.2 V/l/s, Output

54 Exp flow patient buff 7.2 7.2 43.2,7.2 /7.2/43.2 V/l/s, Output

55 Insp press buff 10.7 mV, 10,7 mV/cm H2O, Output

56 –57 –58 –59 Serial data to slave test H, 0 V ; 5 V, Input60 Receive address test L, 0 V ; 5 V, Input61 Control enable test H, 0 V ; 5 V, Input62 Receive address buff L, 0V ; 5 V, Output

300-

L27X

J31 2 3 4 5 6 7 8

910111213141516

1 2 3 4 5 6 7 8

910111213141516

J2

SignalNo: 29 8 30 9 3147 48 49 50 27 6 28 7

8



Serial communication portsN82 and N83

26 pole D-sub connectors (N82 and N83).For RS-232-C data communication and forconnection of monitoring/recordingequipment. The connectors are identicalwith one exception; the internal clock canonly be set via N82.Only Siemens connection cable must beused.


300-

A18

X

9

26

18

19

10

1N82 / N83

1 –2 DCG (RS 232-C signal ground), Input/Output ref.3 N82: RTS 1 H / N83: RTS 2 H (RS 232-C), Output4 N82: TD 1 L / N83: TD 2 L (RS 232-C), Output5 N82: RD 1 L / N83: RD 2 L (RS 232-C), Input6 N82: CTS 1 H / N83: CTS 2 H (RS 232-C), Input7 N82: DTR 1 H / N83: DTR 2 H (RS 232-C), Output8 –9 –10 –11 –12 –13 –14 –15 –16 –17 –18 –19 –20 –21 –22 –23 –24 –25 –26 –

Analog input & Digital codeport N84

44 pole D-sub connector (N84). Optionalinput interface. Only Siemens connectioncable must be used.


300-

A19

X

15

44

30

1

31

16

N84

1 –2 AUX GND (AUX signal ground), Input reference3 AUX GND (AUX signal ground), Input reference4 AUX GND (AUX signal ground), Input reference5 AUX 8, -10.00 V – +9.99 V, Input6 AUX 7, -10.00 V – +9.99 V, Input7 AUX 6, -10.00 V – +9.99 V, Input8 AUX 5, -10.00 V – +9.99 V, Input9 AUX 4, -10.00 V – +9.99 V, Input10 AUX 3, -10.00 V – +9.99 V, Input11 AUX 2, -10.00 V – +9.99 V, Input12 AUX 1, -10.00 V – +9.99 V, Input13 –14 –15 –16 –17 GND, Input/Output reference18 AUX CODE 1, 0 V; 5 V, Input19 AUX CODE 2, 0 V; 5 V, Input20 AUX CODE 3, 0 V; 5 V, Input21 AUX CODE 4, 0 V; 5 V, Input22 AUX CODE 5, 0 V; 5 V, Input23 AUX CODE 6, 0 V; 5 V, Input24 AUX CODE 7, 0 V; 5 V, Input25 AUX OFF, 0 V; 5 V, Input26 –27 –28 –29 –30 –31 –32 –33 –34 –35 –36 –37 –38 –39 –40 –41 –42 –43 –44 –



8

Interconnection cable

The INTERCONNECTION CABLE is the 2.95 m long89 leads cable that connects the Control unitwith the Patient unit. Signal names and pinnumbers are listed below:

Connected at Connected atpatient unit control unitN16 N50Pin No. Signal name Pin No.

1 Dis Saf valve and 24 V L 12 O

2 cell connected L 2

3 – 34 SF 6 conc 45 CO

2 values 5

6 ET CO2 conc 6

7 Insp flow 78 CO

2 conc 8

9 CO2 trans connected 9

10 Insp time H 1011 Receive address L 1112 Technical error CO

2 exp flow 12

13 CPAP neonate mode H 1314 Serial data to slave H 1415 Exp detection H 1516 Serial data to master H 1617 Enable NEB valve H 1718 Enable O

2 valve H 18

19 Enable AIR valve H 1920 Zeroing insp valves H 2021 Power up reset L 2122 Exp time H 2223 Mon dis insp valves L 2324 Ref dis insp valves L 2425 Reserve 2 2526 Exp flow 2627 Exp valve position 2728 Exp tidal volume 2829 Ext power overload 2930 Pow sup out 1 3031 Pow sup out 2 3132 Pow sup out 3 3233 Battery charging LED 3334 – 3435 Internal battery mode H 3536 Valve code clock H 3637 +24 V low power reg 3738 Load valve code L 3839 Ventilator on H 3940 Serial valve code 1 H 4041 Power on LED 4142 Range sel D0 4243 Adult range L 4344 Range sel D1 44

Connected at Connected atpatient unit control unitN15 N49Pin No. Signal name Pin No.

1 +V 12 +V 23 GND 34 GND 45 GND 56 Sense GND 67 -V 78 -V 89 +5 VL 910 +5 V 1011 +5 V 1112 +5 V 1213 +24 V 1314 Sense +5 V 1415 0 V (24) 1516 0 VA 1617 0 VA 1718 0 VA 1819 GNDL 1920 Reserve 3 2021 SGND 2122 SGND 2223 SGND 2324 SGND 2425 PS 4 2526 – 2627 Humidifier off L 2728 Internal battery voltage 2829 Power supply temp 2930 External battery voltage 3031 Inner shield (soldered) –32 – 3233 Insp press 3334 NEB flow ref 3435 O

2 flow ref 35

36 AIR flow ref 3637 NEB flow 3738 O

2 flow 38

39 AIR flow 3940 Valve position NEB 4041 Exp press 4142 Gas supply NEB press 4243 O

2 conc 43

44 Valve position O2

4445 PEEP level set buff 4546 Gas supply O

2 press 46

47 Barometer press 4748 Valve position AIR 4849 Airway flow 4950 Gas supply AIR press 50



Functional block diagramLetter codes shown within a circle in the Functional block diagram

Code Refers to block function PC board No(s)

A Inspiratory valve unit – Air .......... PC 1585, 1586, 1593, 1600, 1601, 1602, 1603, 1637B –C Computer interface .................... PC 1587D Computer interface Dummy....... PC 1665E Exp. flow amplifier ..................... PC 1623F –G Pressure amplifier – Exp. ............ PC 1611H Pressure amplifier – Insp. ........... PC 1611I Inspiratory control ...................... PC 1616, 1588J –K –L Exp. flow Linearization ............... PC 1615, 1588M Monitoring .................................. PC 1608, 1588 and with FAB: PC 1690N Inspiratory valve unit – Optional . PC 1634 or other optional PC boardO Inspiratory valve unit – O

2. .......... PC 1585, 1586, 1593, 1600, 1601, 1602, 1603, 1637

P Panel interface ........................... PC 1614, 1588, 1632Q –R –S Safety valve driver ...................... PC 1613T Reference & Timing ................... PC 1605, 1588U Automode panel interface .......... PC 1745V Valve control .............................. PC 1622W Power supply ............................. PC 1618X Expiratory valve .......................... PC 1585, 1586

4

P27

N27

B11

2

N16

I

Signs and interpretations

Signs Interpretations

Information coming from Monitoring

Information going to Inspiratory control

Guide to Circuit Diagram sheet number

Internal male connector number

Internal female connector number

Internal connector pin number

Internal signal path(s) (2 paths in example)

Internal cable with connector

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