Digital Motor Protection Relay

DSP – AOL / AOM.

AOM

AOL

Contents

1. Abstraction.

2. Main Features.

3. Functions.

4. Technical Specifications.

5. Pre-set Description.

6. Mode Rotation Order.

7. Input – Output Terminals.

8. Control Key Operation.

9. Trip Indication.

10. T – I Characteristics.

11. Rotation Indication.

12. Trip Timing Diagrams.

13. Application Diagrams.

14. Dimensions.

Digital Motor Protection Relay.

DSP – AOL / AOM

1. Abstraction.

AOL Panel Mounting Type AOM Panel Flush Mounting Type

Installation Model Protection Description

Panel Mounting

Type DSP – AOL

Over Current

Under Current

Phase loss

Reverse Phase

Locked Rotor

Current unbalance

Ground Fault

Password, Self – Diagnostics,

Alarm Panel Flush Mount-

ing Type DSP - AOM

2. Main Features.

· Password protection.

· MCU based digital control.

· Compact size.

· Multi-function.

o Protection: Over current, Under current, Phase loss, Phase Reverse,

Locked rotor, Current unbalance, Ground fault.

o Indication: Current L1 L2 L3, Earth current, Load factor %.

· Wide current range protection.

o Type 10 : 0.5A – 10A, external CT : 0.5A – 6A.

o Type 70 : 5A – 70A.

o Extended current range with external CT : 1A – 1200A.

· Show trip cause and operation information 5 digit display.

· Information updated every 3 seconds.

· Various rated ZCT’s to sense zero phase current for GF protection

o Standard type: External ZCT.

· High sensitivity and wide range for ground fault protection: 50mA – 2a / Zero –

phase sequence current.

· ZCT alarm when not connected: Alarm activated when control power ap-

plied and ZCT is disconnected, flickering “Ec-ct” when “Ec” mode not set to

“off”.

· Various ways to reset after a trip: Manual, Electrical, Automatic.

· Stable operation under frequency variation: 30Hz – 300Hz.

· Self – diagnostic test.

· Over current alarm before tripping.

· Last 8 trip history.

· Connection cable with line noise filter between display meter and converter:

Panel flush mounting type.

Type External ZCT

DSP – AOL - V, DSP – AOM - V 200mA / 100mV

DSP – AOL –A, DSP – AOM – A 200mA / 1.5mA

3. Function.

Protection Operating time Description

Over current · d – time

o 1 – 300 sec / def.

· o – time

o Definite / 1 – 60 sec.

o Inverse / 0.2 – 30

class.

Over current protection for each phase

L1, L2, L3.

Under current · U – time

o dt + 0.5 – 30 sec /

def.

Under current protection for each

phase L1,L2,L3.

Current

unbalance

8 sec. · Adjustable : 30% - 90%

· Rate % = ((max-min)/max) * 100

Phase loss 1 – 5 sec / def. Phase loss protection for each phase L1,

L2, L3 based on load current.

Phase reverse Within 0.5 sec. Phase reverse protection based on load

current.

Locked rotor dt + 0.1 sec. Locked rotor protection while starting.

Ground fault Edt: 1 – 25 sec.

Eot: 1 – 30 sec / def.

Ground fault protection, zero phase

current sensed through ZCT.

Indication Description

Indication dur-

ing operation.

· Indication every 3 sec: L1 current > L2 current > L3 current > Earth

current > Load factor %.

· Press “CLR” to halt / resume rotation.

Check pre-set

value of each

mode during

operation.

· Check a value and a mode by pressing “SET” key once during oper-

ation.

o Pre-set value and mode appear alternatively.

· Check next mode by pressing “CLR” key once.

· Return to operating mode by pressing both “SET” and “CLR” at the

same time or time out after 15 sec.

Alarm · Alarm before tripping when actual current is greater than per-set

alarm value “OC” for 3 sec.

· “AL” & pre-set value % alternating for phase over current.

Function Description

Load current range Type 10 0.5A – 10A or external CT (0.5A – 6A)

Load current range Type 70 5A – 70A

Load current range With external CT 1A – 1200A

Ground fault current Zero phase current · 50mA – 2A

· Sensing through external ZCT

o V Type : 200mA / 100mV

o A Type : 200mA / 1.5mA

Pre-set time Stating delay time (dt) 1 – 300 sec / def.

Over current trip delay time (ot) · 1 – 60 sec / def.

· 0.2 – 30 Class / Inverse.

Under current trip delay time (ut) dt+0.5 – 30 sec / def.

Ground fault starting delay time (Edt) · OFF

· 1 – 25 sec / def.

Ground fault trip delay time (Eot) 1 – 30 sec / def.

Phase loss trip delay time (PLc) 1 – 5 sec / def.

Allowable tolerance Current C<=2A: 0.2A, C>2:+-5%

Time T<=2 sec: +- 0.2 sec, t>2 sec: +-10%

Control power 85VAC – 260VAC, 50 / 60 Hz.

(90VDC – 370VDC)

24VDC +-10%

Trip output relay Main 95 – 96 – 98 1CO (1 – SPDT) 3A Resistive

Aux 05 – 06 – 08 1CO (1 – SPDT) 3A Resistive alarm one of Ec, Ec-td,

AL, uc or Shoc.

Environment Temperature Operation: -25oC to +70oC

Temperature Storage: -40oC to +80oC

Humidity 30 – 85% non-condensing

Current tolerance to frequency variation Average +-5% 30Hz to 300Hz.

Maximum conductor size (without external CT) 25 mm sq.

Screw torque Maximum 0.6 Nm.

Insulation Resistance / IEC-60255-5 100 Meg Ohm or more / 500VDC circuit – case.

High voltage withstand test / IEC-60255-5 · Circuit – case: 2KVAC, 60Hz, 1 minute.

· Contact – contact: 2KVAC, 60Hz, 1 minute.

Lightning impulse voltage withstand test / IEC-60255-5 · Circuit – ground, circuit – circuit: 1.2/50uS,

5KV.

· Control circuits: 1.2/50uS, 5KV.

1MHz Burst immunity test / IEC-61000-4-18 2.5KV, Positive / Negative under 2sec.

Electrostatic discharge / IEC-61000-4-2 · Air: Level 3, 8KV.

· Contact: Level 3, 6KV.

Radiated electromagnetic field disturbance / IEC-61000-4-5 Level 3, 10V/m.

Electric fast transient burst / IEC-61000-4-4 Power, Relay output: Level 4, 4KV.

Surge immunity test / IEC-61000-4-5 Relay output: 1.2x50uS, 2KV (0o, 90o, 180o, 270o).

Conducted disturbance test / IEC-61000-4-6 10V, Level 3.

Power consumption 4W maximum.

4. Technical Specifications.

5. Pre-set Description.

6.

Mode Function /

Range

Description Factory Setting

p**** Password. · Enter 4 digit code “****” to enter setting mode.

o Move cursor from first digit to last using the “CLR”

key.

o Change password in “PEdIt” mode in CAB mode

group.

0000

Out / a / b Define the func-

tion of main trip

output relay.

· Trip output: 1c (95 – 96 – 98).

· a Fail Safe.

o Output relay state is changed when control pow-

er is on (95-96 Open) (95 – 98 Closed).

· b Non-Fail Safe.

o Output relay (95 – 96 Closed) (95 - 98 Open).

· This function cannot be changed during motor operation.

b

ct / setting

value

Pre-set ratio for

external CT.

· This mode available for type 10.

· Pre-set CT ratio (primary value / 5).

· CT ratio: 1 – 240.

· 2t: 2 turns through CT.

· 4t: 4 turns through CT.

· 1: Sense current through own CT or external CT ratio 5/5.

1

oc /Setting

value

Pre-set range for

over current.

· Current range for over current protection.

o Type 10: 0.5A – 10A or for external CT / 0.5A – 6A.

o Type 70: 5A – 70A

Type 10 / 10A.

Type 70 / 70A.

dt / OFF /

Setting

value

Pre-set starting

delay time.

· Trip delay time to prevent unwanted trips during starting.

o 1 – 300 sec.

o Sensing current over 0.2A otherwise dt not used.

5 sec.

Otc / deF /

Inv

Select time cur-

rent characteris-

tics for over cur-

rent protection.

· T – I characteristics: deF / Inv.

o deF (definite): Trip based on pre-set value of “OC” and

“ot”.

o Inv (inverse):

§ dt = 0: trip based on cold curve

§ dt > 0: trip based on hot curve after dt pre-set

(dt + inverse curve time).

§ Multiple value in type 70: 1 – (210/”OC” pre-set

value).

deF

Ot / Setting

value

Pre-set trip delay

time.

· Trip delay time when “OC” current exceeded.

o Definite: 1sec – 60sec.

o Inverse: 0.2 – 30 Class.

5 sec.

Lc / oFF / on Locked rotor. · oFF: disable lock rotor (def)

· on:

o trip in 0.1 sec after dt (“Otc”=def) if starting current ex-

ceeds 300% of oc pre-set value during dt.

o Over current cold curve (“Otc”=Inv).

oFF

PLc / oFF /

setting value

Phase loss by load

current.

· oFF: disable phase loss.

· 1 – 5 sec adjustable: trip on phase loss based on load current.

oFF

RPc / oFF /

setting value

Reverse phase by

load current.

· oFF: disable reverse phase.

· on: trip on reverse phase based on load current within 0.5 sec.

oFF

Ec / oFF / set-

ting value

Pre-set zero phase

current.

· Ground fault protection.

o oFF: disable.

o Sensitive range: 50mA – 2A.

o ZCT.

§ AOL / M – V type: 200mA / 100mV.

§ AOL / M – A type: 200mA / 1.5mA.

o ZCT disconnected alarm when motor stop state: “Ec-ct”

flashing.

oFF

Edt / oFF /

setting value

Starting trip delay

time.

· Definite T – I.

· Pre-set range; 1 – 25 sec.

· Alternate “Edt” & “- -“ when “Ec” mode disabled.

“- -“

Eot / setting

value

GF protection trip

delay time.

· 1 – 30 sec / def.

· Alternate “Eot” & “- -“ when “Ec” mode disabled.

“- -“

uc / oFF / set-

ting value

Under current pre-

set range.

· Pre-set range: 0.6A - <”OC” pre-set value.

· When “OC”<0.7A “UC” is not available.

2 sec.

ut / setting

value

Under current

delay time.

· Pre-set time after dt time.

· 0.5 – 30 sec.

2 sec.

ub /oFF/ set-

ting value

Define current

unbalance.

· Current unbalance phase to phase.

o %Unbalance=((max-min)/max)*100

· Pre-set range: 30% - 90%.

50%

Au-o / oFF /

Ec / AL / uc /

Ec-tb

Define function of

AUX trip relay.

· oFF: same output as main trip.

· AL / Uc trip output is independent to main trip

and selected factor is not available for main trip.

· Auto reset when trip cause is clear.

· Ec: only for ground fault protection.

· Uc: only for under current protection.

· AL: Alarm only for oc before trip.

· Ec-tb: only for ground fault protection, not reset

when trip cause is clear, trips with main trip.

oFF

AL / setting

value

Pre-set alarm lev-

el (%) of “OC”.

· When “AL” not selected in “Auo” mode then “AL

- - “ is displayed.

· Pre-set range 65% - 100% of “OC”

· Alarm trip for pre-set alarm % for 3 sec or more

“AL” & pre-set value %” alternate flashing in

phase rotation order.

90

rESt / Hr / Er /

A-rE

Trip reset. · Hr: manual reset password required.

· Er: Electrical reset.

o “Reset” key.

o “CLR” key.

o Control power off.

· A-rE: Auto reset.

Aut / setting

value

Auto reset time. · Time range: Instant, 1 – 300 sec.

· When “Hr” is selected in “rESEt” mode “Aut” is

disabled.

trIP / 8 – 1 /

trip cause /

trip value

Show last 8 trip

causes.

· Show last 8 trip causes in order.

o Press “UP or “DN” in the “trip” mode to

show cause.

o Press “CLR” or “SET to show next or previ-

ous cause.

o To enter setup state for trip press and

hold “UP” then press “DN” then release

“DN” finally release “UP”.

tESt · Check relay normal operation.

· “tESt” is displayed the test button pressed or “CLR” for 3 sec.

· Main relay (95 – 96 – 98) & AUX relay (05 – 06 – 08) output will trip after counting

down pre-set 0-time.

Calibration Mode Cab.

To access the calibration mode press “SET” key for 5 sec. or more. To exit calibration mode press

“SET” once more.

6. Mode Rotation Order.

7. Input – Output terminals.

· DSP – AOL / AOM Standard type / with external ZCT.

Terminal diagram.

Mode Function / range Description Factory setting

P**** Password input Input password to adjust this mode group. 0000

CrPEr Calibration for “R”

current

0 Adjustment range +-0.1A to 10A by using the “UP”

and “DN” keys.

CSPEr Calibration for “S”

current

0

CtPEr Calibration for “T”

current

0

EcPEr Calibration for GF

current

Adjustment ranger +-50% by using the “UP” and ”DN”

keys.

100

oPSEt /

ON / OFF

Adjust pre-set during

the operation

· ON: Change pre-set values during motor op-

eration except “out” mode.

· OFF: No mode changes during motor opera-

tion.

ON

PedIt Change Password · Use “UP” and “DN” key to change digits

· Use “SET” and “CLR” key to move between

digits.

· Exit setting mode press “CLR”

· Save new password press “SET” and “CLR”

keys together.

7. Input - Output terminals.

DSP- AOL/AOM Standard type / with external ZCT

DIV Feature Terminal Description

Input Control Power A1(+), A2(-) · 85 – 260VAC, 50 / 60 Hz.

· 90 – 370VDC

· 24VDC

Input ZCT Z1, Z2 · External ZCT.

o V type: 200mA / 100mV

o A type: 200mA / 1.5mA

Indication Red Operating

Available on converter with display. Green Power / Stop

Yellow Trip

Output Main Trip 1c: 95-96-98

· Over current.

· Under current.

· Locked rotor.

· Phase loss.

· Reverse phase.

· Ground fault.

· Current Unbalance.

Output Aux Trip 1c: 05-06-08 · Au-o/ oFF / Ec / AL / uc / Ec-tb.

· Excluded from main trip except oFF / Ec-tb.

8. Control Key Operation.

“SET” key · Press “SET” key to enter setting mode, then password (P0000 factory password).

· Move cursor from left to right by pressing “CLR” confirming password.

· Change password by using “UP” & “DN” keys.

· To exit press “SET” & “CLR” keys together or wait 15sec.

Key functions · “SET”: Backward direction / to exit setting mode.

· “CLR”: Forward direction.

· “UP” & “DN”: change number or character in pre-set mode.

“SET” key & “CLR” key

to select mode

· Select mode by using “SET” or “CLR” key.

“UP” key & “DN” key

to adjust value

· Change the pre-set value by pressing the “UP” or “DN” key.

“SET” key & “CLR” key

to store changes

· Save changed value by pressing both “SET” and “CLR” keys together or after 15

sec.

“CLR” key · Press “CLR” key during run time to halt display rotation of values.

· Move through run time values one by one by pressing “UP” or “DN” key.

Check pre-set mode

value during opera-

tion

· Check mode and value while in run time by pressing “SET” key once.

· Mode and pre-set value alternate.

· Press “CLR” key once to move to next mode.

· Press “SET” & “CLR” keys together to exit mode or wait 10 sec.

· No changes to per-set values in this mode.

Test / Reset: “CLR”

key

· Checks relay operation.

· “tESt” displayed when test button pressed or “CLR” key held for 3 sec, to exit press

“CLR” key or test button.

· Main trip (95-96-98) & AUX trip (05-06-08) will trip after pre-set o-time (definite T-I).

· LED on converter is on after the trip.

· To rest press “CLR” once.

9. Trip Indication.

Trip cause and value appear alternatively.

Trip Display Cause

Over current (oc) Trip caused by over current in phase L1.

Under current (uc) Trip caused by under current in phase L1.

Current unbalance Trip caused by unbalanced current in phase L3.

GF Trip caused by ground fault current.

Phase loss Trip caused by phase loss L1 to load.

Reverse phase Trip caused by reverse phase to load.

Locked rotor Trip caused by locked rotor in phase L2 during

motor start.

“Ec-ct” flashing ZCT is not connected to Z1 – Z2 when motor

stopped when “Ec” selected.

10. T-I Characteristics.

· Definite.

· Inverse.

11. Indication rotation.

· 3 phase current (L1, L2, L3), Earth current, Load factor.

12. Trip timing diagrams.

· Over current protection / “Au-o” mode: OFF / AUX (05-06-08).

· GF protection / “Au-o” mode: Ec (05-06-08).

· GF protection / “Au-o” mode: Ec-tb (05-06-08).

13. Application Diagram.

· DSP-AOL.

· DSP-AOM.

14. Dimensions.

AOL Type.

AOM Type.

· Display