ssdac-g36

An Insight Into

Single Section Digital Axle Counter (SSDAC-

G36)

Approved by RDSO

To SPEC No. RDSO/SPN/177/2005 Ver 2.0 with Amendment

1

By

G.G.Tronics India Private LimitedSB 168, 3rd Cross, Peenya 1st Stage, Peenya Industrial Estate, Bangalore-560 058

Ph : 080-28372449/50/51 Fax : 080 – 28372387 Web:www.ggtronics.com

April 8, 2023 An Insight into SSDAC-G36 2

Overview

SSDAC-G36 is a fail-safe microcontroller based system with 2 out of 2 architecture suited for proving Block Section and Entry/Exit of station.

Supports the following configurations with fool proof arrangement of communication path and addressing scheme.

2 DP-SS : in Straight Line (2D) 3 DP-SS : in Point Zone / Set Points (3D) 3 DP-2S : for two consecutive sections in

Straight Line AS : auto signaling

Third party Verification and Validation of software completed for all configurations complying to CENELEC En50128 with SIL-4 level


Application of SSDAC-G36

2DP version is intended for providing clear/occupied status of a single section block or entry/exit of a station.

3DP-1S version used for proving point zone/set points working

3DP-2S version employed for proving two consecutive sections in a straight line treating each independent of the other


Functional Aspects Detection and counting of wheels / axles

Detection of direction of axle movement

Declaring a block section as occupied on the very first count of an axle

Transmission/Reception of counts, system status and many vital information to other SSDAC unit via FSK communication employing quad cable

Carrying out count comparison between local and remote units

Declaring the track section clear after both the local and remote counts match after clearance of the last vehicle

Displaying axle counts, unit status and error messages locally in each unit and also remotely in the Reset box connected to the unit

Logging vital information in event logger, for downloading on PC with GUI package through RS232C


Functional Aspects (Contd…)

Shunting operation taken care of Train Shunting

No restrictions Wheel Shunting

Single sensor sensed once - allowed Single sensor sensed twice -Error mode Dual sensor - allowed up to 3 times Dual Sensor - 4 times - Error mode

Communication scheme Fail-safe feature incorporated to avoid wrong addressing Communication takes place only in fixed pairs

Com1Com2 : Normal Com1Com1 : Error mode Com2Com2 : Error mode


Functional Aspects (Contd…)

Data Logger report retrieval (Through PC using GUI based S/W)

Local – RS232 (Serial port)

Portable Data Logger (Optional) For downloads all the events from SSDAC event logger card


Main Requirements of Specification - Complied

To meet CENELEC SIL-4 Safety level

Employ phase reversal technique

Use of 2 out of 2 voting

Data logging for 14000 events

To work with 90-R, 52 Kg, 60 Kg rails

Use of industrial grade components

Stable operation in RE areas.

To work between –10° C to +70° C

MTBF more than 70000 hours ( As per QM115 method )

To work between train speeds of 5Kmph to 250Kmph

Not to need trolley suppression circuit


Salient Features

Common hardware/software for all configurations

Actuates Vital and Preparatory Relays

Preparatory Reset after line verification possible

Cooperative Reset from the station master cabin

Reliable inter-communication of data between the units at distances up to 25 km or -30dB loss through quad cables at 1200bps using V.23 protocol

Works with 24V DC power supply


Salient Features (Contd…)

Wide input voltage operation from 16.8 VDC to 32.0 VDC

Wrong operations totally avoided with unique addressing of units up to 255 combinations

Upgradation to higher configuration possible

Integrated with lightening surge protectors

Water logging on track does not affect the functioning of the system


Installation Details – Cable requirement

S TA TI O NB

S TA R T FED

TX 1 TX 2

R X 1 R X 2

END FED

TX 1 TX 2

R X 1 R X 2

S TA TI O NA

M O D E M C O M M UN I C AT I O N1 /2 q u ad c ab le

M AX I M UM 2 5 KM 's

AP P R O AC HD E T E C T O R SUP D I R E C T I O N

AP P R O AC HD E T E C T O R SD O W ND I R E C T I O N

6 c o r e c abl e1 .5 Sq m mR e s e t andR e pe atR e l aySi g nal

2 c o r e c abl e2 5 Sq m mpo w e r

6 c o r e c abl e1 .5 Sq m mR e s e t andR e pe atR e l aySi g nal

2 c o r e c abl e2 5 Sq m mpo w e r

1 /2 quadc abl e(o pt i o nal )s tat i o nm as te rc o m m uni c at i o n

1 /2 quadc abl e(o pt i o nal )s tat i o nm as te rc o m m uni c at i o n

2 1 KH Z 2 1 KH Z

2 1 KH Z 2 1 KH Z

2 5 KH Z

2 5 KH Z

2 5 KH Z

2 5 KH Z


Installation Details – Typical Installation- 2DPR a i l w a y Tr a c k

A x l e D e t e c t o r s

R X

A x l e D e t e c t o r s

S S D A C EF

S ta tio n B

S S D A C S F

R X

TXTX

P D 1 P D 2

C P U1

C P U 2

RD

2 DC

-DC

Co

nv

erter

P D 1 P D 2

C P U1

C P U 2

RD

1 DC

-DC

Co

nv

erter

CO

M2

SP

AR

E

SP

AR

E

S ta tio n A

Po we r s u pply

R e s e t B o x

CO

M1

SP

AR

E

SP

AR

E

R e s e t B o x

S MC P U /Eve n tL o g g e r

S MC P U /Eve n tL o g g e r

R e l a y B o xV i t a l R e l a y BP r e p R e l a y B

2 5 KHz2 5 KHz

D i s p l a y U n i t D i s p l a y U n i t

R e l a y B o xV i t a l R e l a y AP r e p R e l a y A

2 1 KHz2 1 KHz

To S S D A CS F Un i t

To S S D A CEF Un i tR S 2 3 2 / FS K

C om m u n ic ation

R S 2 3 2 / FS KC om m u n ic ation

Po we r s u pply

FS KC o m m u n ica t io n

24VD

C

24VD

C

F ilter U n it

F ilter U n it

2 1 K H z R X2 1 K H z TX

2 5 K H z R X2 5 K H z TX


Wheel Detection Principles

Phase detection employed

Signals fed at 21Khz and 25Khz to Tx coils – at 60V

Phase of signal output of Rx compared with Tx

AT PD Module/Card : Under No wheel Tx and Rx signals will be 180° OUT-OF-PHASE

>10V Under wheel condition Tx and Rx will be IN-PHASE <100mV

These are fed to CPU at 5V and 0V

Wheels above 500mm diameter only are detected

For a train at 250Kmph, pulse width is about 2.2ms

Frequency of Scanning by processor for PD signal is 300µs – 7 times for every wheel


Wheel Detection - Train Wheel - Count

Overlap Signal

PD1

PD2


Wheel Detection - Trolley Wheel - No Count

Non-Overlap Signal

PD1

PD2


Wheel Detection - Dip Lorry - No Count

No Detection

PD1

PD2


Schematic - 2DP Version

Operation on straight lines - station or block section

Communication using 1 pair / half Quad cable or OFC voice channel

Preparatory Reset with piloting

PR and VR contacts at detection points

DP-SF DP-EFStation Section

Station

Station A

Station BBlock Section

DP-SF DP-EF

Legend :RD1, RD2 Relay Drive Card

Com1, Com2 Communication

CardSF Start FedEF End Fed VR Vital RelayPR Preparatory Relay

DAC-2

Com1

PR

End Fed

DAC-1

Com2

Start Fed

RD1RD2

PR

VR VR


System Configuration - 2DP Version

Legend :RD1, RD2 Relay Drive Card Com1, Com2 Communication

CardSF Start FedEF End Fed VR Vital RelayPR Preparatory Relay

DAC-2

Com1

PR

End Fed

DAC-1

Com2

Start Fed

RD1RD2

PR

VR VR

2DP Card Configuration in SSDAC G36

DAC-1 DAC-2P

hase D

ete

cto

r C

ard

-1

Ph

ase D

ete

cto

r C

ard

-2

DC

-DC

Con

vert

er(

+2

4V

)

CP

U-1

CP

U-2

Com

-1

SM

-CP

U

Even

t Log

ger

Rela

y D

rv-1

Ph

ase D

ete

cto

r C

ard

-1

Ph

ase D

ete

cto

r C

ard

-2

DC

-DC

Con

vert

er(

+2

4V

)

CP

U-1

CP

U-2

SM

-CP

U

Even

t Log

ger

Com

-2

Rela

y D

rv-2


Schematic - 3DP-1S Version

Operation on point Zones / Set points

Communication using quad cable or OFC voice channel

Detection at any point and clearing at any point

Preparatory Reset with LV

VR contacts at detection points

DP-B

DP-C

DP-A

Legend :RD1, RD2 Relay Drive

Card Com1, Com2

Communication CardVR Vital Relay

DAC-1

Com1 Com2

Unit A

RD2VR

DAC-2

Com1 Com2

Unit B

RD2VR

DAC-3

Com1 Com2

Unit C

RD2VR


System Configuration - 3DP-1S

Legend :RD1, RD2 Relay Drive

Card Com1, Com2

Communication CardVR Vital Relay

DAC-1

Com1 Com2

Unit A

RD2VR

DAC-2

Com1 Com2

Unit B

RD2VR

DAC-3

Com1 Com2

Unit C

RD2VR

3DP Card Configuration in SSDAC G36

DAC-1 DAC-2 DAC-3P

hase D

ete

cto

r C

ard

-1

Ph

ase D

ete

cto

r C

ard

-2

DC

-DC

Con

vert

er(

+2

4V

)

CP

U-1

CP

U-2

Com

-1

SM

-CP

U

Even

t Log

ger

Com

-2

Rela

y D

rv-2

Ph

ase D

ete

cto

r C

ard

-1

Ph

ase D

ete

cto

r C

ard

-2

DC

-DC

Con

vert

er(

+2

4V

)

CP

U-1

CP

U-2

Com

-1

SM

-CP

U

Even

t Log

ger

Com

-2

Rela

y D

rv-2

Ph

ase D

ete

cto

r C

ard

-1

Ph

ase D

ete

cto

r C

ard

-2

DC

-DC

Con

vert

er(

+2

4V

)

CP

U-1

CP

U-2

Com

-1

SM

-CP

U

Even

t Log

ger

Com

-2

Rela

y D

rv-2


Schematic - 3DP-2S Version

Station A

Station B

Section A Section B

Block Section

DP-SF DP-EFDP-CF

Legend :SF : Start Fed CF : Centre Fed EF : End Fed CFVR - A : Vital Relay for Sec A at Centre Fed CFVR - B : Vital Relay for Sec B at Centre FedCom1, Com2 : Communication Card EFVR - A : Vital Relay at Sec B for End FedPR : Preparatory Relay SFVR - A : Vital Relay at Sec A for Start Fed

DAC-SF Com2

SF

RD2SFVR-APR A

Reset-SFSection-A

Reset-CFSection-B

Station-A

DAC-EFCom1

EF

RD1EFVR-BPR B

Reset-CFSection-A

Reset-EFSection-B

Station-B

DAC-CFCom1 Com2

CF

RD2 RD1CFVR-APR A

CFVR-BPR B


Schematic 3DP-2S (Contd…)

Operations on two consecutive sections on a straight line.

Section A and B are independent and can be reset individually

Communication using single pair / half quad cable or OFC voice channel.

Co operative Preparatory reset with piloting


System Configuration - 3DP-2S

3DP-2S Card Configuration in SSDAC G36

Ph

ase D

ete

cto

r C

ard

-1

Ph

ase D

ete

cto

r C

ard

-2

DC

-DC

Con

vert

er(

+2

4V

)

CP

U-1

CP

U-2

Com

-1

SM

-CP

U

Even

t Log

ger

Com

-2

Rela

y D

rv-2

Rela

y D

rv-1

Ph

ase D

ete

cto

r C

ard

-1

Ph

ase D

ete

cto

r C

ard

-2

DC

-DC

Con

vert

er(

+2

4V

)

CP

U-1

CP

U-2

Com

-1

SM

-CP

U

Even

t Log

ger

Rela

y D

rv-1

Ph

ase D

ete

cto

r C

ard

-1

Ph

ase D

ete

cto

r C

ard

-2

DC

-DC

Con

vert

er(

+2

4V

)

CP

U-1

CP

U-2

SM

-CP

U

Even

t Log

ger

Com

-2

Rela

y D

rv-2

DAC-SF Com2

SF

RD2SFVR-APR A

Reset-SFSection-A

Reset-CFSection-B

Station-A

DAC-EFCom1

EF

RD1EFVR-BPR B

Reset-CFSection-A

Reset-EFSection-B

Station-B

DAC-CFCom1 Com2

CF

RD2 RD1CFVR-APR A

CFVR-BPR B


AS or Auto Signalling

Operation on continuous sections in suburban areas or on a long track

Up to 128 SSDAC’s can be daisy chained in series

Communication using single pair / half quad cable or OFC voice channel

Option of Preparatory Reset with or without piloting

Block 1 Block 2 Block n+1

Section n+1

Section C

Section B

Section A


Hardware Modules / Cards

CPU Card (CPU1 & CPU2) Failsafe 2 out of 2 architecture for controlling and monitoring the SSDAC for reliable

operation Houses the system software that schedules the overall operation as per configuration

Phase Detector Card (PD1 & PD2) A vital card that detects the movement of train axles/wheels that is more than 550mm

diameter Rejects trolley, dolly, spoke wheels and push trolley wheels Counts the total number of train axles and updates the system

Communication Card (Com1 & Com2) Communication between two SSDAC systems is through FSK communication at 1200bps

V.23 standard along with CRC check Vital data like axle counts and system status are transmitted/received between the

SSDAC system units

Relay Drive Card (RD1 &RD2) Axles sensed by Detector Coils are fed to PD card which in turn feeds signal to CPU. The

relay drive card receives instructions from CPU for actuating Vital relay for blocking a section as soon as the first axle is detected. It is cleared after both IN and OUT counts of the section match

Power Supply Card Generates required multiple power outputs from 24VDC input


Hardware Modules / Cards (Contd…)

SM-CPU or Event Logger Card Monitors the SSDAC system and logs vital events during normal and

error operation with date and time stamp As many as 95 different events are recorded Optional display connected to Event Logger Card displays the

communication errors happening in Real-time which aids in assessing the health of communication channel

Event logged during normal operation Communication status ok Vital and Preparatory Relay pickup / drop Reset operations

Event logged during error operation Communication link fail System down due to failure of any card Vital and Preparatory Relay error status +5 VDC variations Errors


Typical SSDAC-G36 Unit

LCD Status Display module

PD Cards

CPU Cards

24VDC Power Supply

Relay Drive Card

Event Logger Card

Communication Card


Typical Site Installation

SSDAC-G36 installed in Location Box


SSDAC-G36 unit with PR and VR Relays in a box and Display Module


Internal wiring with LDU and fuse


Axle detector coils web mounted on to a track


Checking for Not Sensing of Trolley wheel


Reset Box with LCD Display – Clear condn of track

RESET Box installed at Station


Reset Box with LCD Display – Occd condn of track


Reset Philosophy

Types of Reset

Co-operative Preparatory Reset with piloting for 2D and 3D-2S

configurations

Direct Reset with line verification for 3D configuration

Reset Procedure

2D : System powered onReset ModePrep ModePilotingClear

Mode

3D-2S: System powered onReset ModePrep

ModePilotingClear Mode

3D : System powered on Reset ModeLVClear Mode


Installation Procedure

The installation can be taken up with the following parallel activities

Laying foundation as per Railway standards for fixing the location box

Trenching for running the required length of cable

Drilling of track for fixing TX/RX coils with the template

Fixing of TX/RX coils on the track

Laying of power cables, signalling cables and cables from TX/RX coils

Painting and fixing of required planks and fuse the terminal block

Digging Earth pit and getting ready the earthing arrangement

Checking for the compliance of pre commissioning check list

Placing the unit along with related PCB modules/cards and Display module

Connecting earth terminal of the unit chassis to the main chassis and on to the main earth through copper cables


Installation Procedure (Contd…)

Placing Relay box adjacent to the unit

Fixing of the MS Coupler cable assemblies on to the designated mating Couplers on the rear panel of the system

Checking continuity and insulation resistance between cable pairs and also between the chassis and the cables

Connecting all the shields and the screen wires to the earth

Fixing of the reset box in a convenient location in the station

Connecting the wires coming from the system to the reset box

Connecting 24V DC to power supply

Connecting the power cables coming from the system to the source of power supply of 24V DC at the station, keeping the FTB connector open


Maintenance

Periodicity Maintenance

WeeklyCheck for the proper voltage at the

battery source for the unit

Fortnightly

Check and record the readings of1. Power supply module 2. PD module3. Check the coil Voltages

Half yearly / Yearly

Replace defective parts if any

Every 5 YearsPower Supply/DC-DC Converter

modulesmust be replaced


Backup Spares (Recommended)

Sl.No

SSDAC Spares Quantity

1 Phase Detector modules1&2 (PD1 and PD2) 2

2 CPU1 and CPU2 Modules 2

3 Communication Modules 2

4 Relay drive Module 1

5 Event Logger/SM-CPU Module 1

6 DC-DC converter Module 1

7 Axle detectors 21 KHz/25KHz (TX coil) 2

8 Axle detectors 21 KHz/ 25 KHz (RX coil) 2

9 Hardware for mounting axle detectors 1

10 MS circular connectors (6 No.) 1

11 Reset box RB 1

12SSDAC unit (housing with mother board, without

modules)1

13 Relay Box 1


Recommended Tools

Sl.No Tools Quantity

1PC/Laptop for downloading event logger

data for analysis and report generation1

2Pure sine wave Digital Multimeter (Fluke

make 187 or Rishab make 28S or similar1

3 Train simulator 1

4 Extender module 1

5 Dummy wheel 1

6 Ring spanner 17-19,24-26 1

7 Open end spanner 17-19, 24-26 1

8 Socket spanner with handle 1

9 Torque wrench 1

10 Screw Driver No. 902 1

11 Screw Driver No. 935 1

12 Marking jig for drilling 1


Trouble shooting

For ease of maintenance in the field messages are provided in the Display Module both during healthy and Error conditions

About 61 possible conditions have been identified which drives the system into Error mode.

The errors are displayed in plain English on the Display Module

Further slides indicate the messages, their analysis and the corrective action to be taken


Trouble Shooting

Error Code ondisplay of CPU

Errors Analysis Corrective measure

1 PD1_BOARD_MISSINGError occurred due to missing of the Phase

detector 1 module (PD1- 21KHz) during run time and boot time diagnosis.

Place the PD1 module in the slot and reset the system

2 PD2_BOARD_MISSINGError occurred due to missing of the Phase

detector 2 module (PD2- 25KHz) during run time and boot time diagnosis.

Place the PD1 module in the slot and reset the system

3 SM_CPU_MISSINGError occurred due to missing of the SM-CPU

module during run time and boot time diagnosis.

Place the SM-CPU module in the slot and reset the system

4MODEM_MODULE_A_MISSIN

G

Error occurred due to missing of the Communication A module during run time and boot time diagnosis.

Place the Communication A module in the slot and reset the system

5MODEM_MODULE_B_MISSIN

G

Error occurred due to missing of the Communication B module during run time and boot time diagnosis

Place the Communication B module in the slot and reset the system

6 RELAY_DRIVE_A_MISSINGError occurred due to missing of the Relay

Drive A module during run time and boot time diagnosis

Place the Relay Drive A module in the slot and reset the system

7 RELAY_DRIVE_B_MISSINGError occurred due to missing of the Relay

Drive B module during run time and boot time diagnosis

Place the Relay Drive B module in the slot and reset the system


Trouble Shooting Contd…

8 PEER_CPU_MISSINGError occurred due to missing of the any

one of the CPU module during run time and boot time diagnosis

Place the CPU module missing in the slot and reset the system

9 COMM_LU1_TO_US1_FAILUREWhen EF CPU1 could not transmit to

remote unit (CF or SF) CPU1

Check the communication links (MS Coupler) and Reset the system


remote unit (SF or CF) CPU2


11 COMM_LU1_TO_DS1_FAILUREWhen SF CPU1 could not transmit to

remote unit (CF or EF) CPU1





13 COMM_US1_TO_LU1_FAILUREWhen EF CPU1 could not receive any

response from the remote unit (SF or CF) CPU1





15 COMM_DS1_TO_LU1_FAILUREWhen SF CPU1 could not receive any

response from the remote unit (CF or EF) CPU1




24COMM_DS2_TO_LU2_FAILU

RE

When SF CPU2 does not receive any response from the remote unit (CF or EF) CPU2


25MODEM_ERROR_NO_CARRI

ERCarrier signal is being blocked by

modemReplace the faulty module

26 PEER_CPU_LINK_FAILURE

Error occurred due to missing or error in CPU/ SM-CPU module during run time and boot time diagnosis

Check for the error or presence of SM-CPU/CPU module in the system, rectify the error and reset the system

27 FAILURE_AT_DS Error at Down stream unitCheck the error at remote unit,

rectify the error and reset the system

28 FAILURE_AT_US Error at Up stream unitCheck the error at remote unit,

rectify the error and reset the system

33 PD1_SUP_LOW

PD1 module supervisory is low for 3 seconds and TX and RX coils is not connected properly

Check the PD1 module, coils and reset the system

34 PD2_SUP_LOW

PD2 module supervisory is low for 3 seconds and TX and RX coils not connected properly

Check the PD2 module, coils and reset the system

35 PD1_PULSINGError occurs when any one

sensor is influenced two or more times.

Reset the system

36 PD2_PULSINGError occurs when any one

sensor is influenced two or more times.

Reset the system

37 PD_STATE_MISSINGError occurs when double sensor

is influence in the sequenceReset the system



38 PD_SUP_PULSATINGIf supervisory signals pulsates more

than 4 timesReset the system

39 PD_STATE_FAILError occurs when any state

sequence is missingReset the system

40 PD_NOT_SENSINGError occurs when both the PD

modules doesn’t sense the wheel for more than 3 times

Reset the system

41 PREPARATORY_RELAY_A_FAILURENo/Improper feedback from

Preparatory A relay

Check the connections of Preparatory relay A (PRA) and reset the system

42 PREPARATORY_RELAY_B_FAILURENo/Improper feedback from

Preparatory B relay

Check the connections of Preparatory relay B (PRB) and reset the system

43 VITAL_RELAY_A_FAILURENo/Improper feedback from Vital

Relay A relay

Check the connections of Vital relay A (VRA) and reset the system

44 VITAL_RELAY_B_FAILURENo/Improper feedback from Vital

Relay B relay

Check the connections of Vital relay B (VRB) and reset the system

45 DIRECT_OUT_COUNTWithout IN COUNT, OUT COUNT

registeredReset the system

49 TRANSIENT_POWER_FAILURE_DS1 Power failure at Down stream CPU1 Reset the system

50 TRANSIENT_POWER_FAILURE_DS2 Power failure at Down stream CPU2 Reset the system

51 TRANSIENT_POWER_FAILURE_US1 Power failure at Up stream CPU1 Reset the system

52 TRANSIENT_POWER_FAILURE_US2 Power failure at Up stream CPU2 Reset the system



57INVALID_NETWORK_ADDRE

SSWhen CPU address range wrong

Change the address settings by using LK10 to LK17 links and reset the system

58 INCORRECT_CODE_CRC

This is a Boot Up error. When CRC of the code mismatches with the stored CRC

Re-program the processor and code memory checksum

59 INVALID_CONFIGURATIONWhen unit type and address of

CPU is wrong

Change the address and configuration settings as per the requirement and reset the system

60 INVALID_COUNTS Train with 10,000 wheels Reset the system

61 RAM_TEST_FAILEDThis is an Boot up error when

RAM (In- built memory of Microcontroller) is failed

Replace the Micro Controller


Do’s and Don'ts

Sl.No DO’s

1

The interconnection drawings are to be followed for connecting the Transmitter and Receiver

Coils. Tx1 is 21 KHz, Tx2 is 25 KHz & Rx1 and RX2 coils are 21 KHz & 25 KHz, respectively

2 Ensure that Receiver and Transmitter coil cables are laid in different pipes.

3 Ensure that both the TX coils & RX coils are having proper alignment on Rail.

4 Ensure that packing of sleepers with ballast on both sides of Axle detector is proper

5 Check that metal sheaths of the outdoor cable are connected to earth at both ends

6 The recommended cables for wiring of the system at site should be used

7 The steady battery voltage 24 V should be maintained.

8 The cable connections should not be loose

9 The M.S Coupler connectors of SSDAC are checked and maintained firmly.

10 Preparatory Reset should be done only after ensuring that there is no train

11

It is recommended that heat resisting paint to be used on the apparatus case so that the

temperature inside apparatus case is maintained lower in comparison to other normal paints


Do’s and Don'ts Contd…

Sl.No DON’Ts

1Don’t cut or join the Transmitter/Receiver cables supplied along with the coil. It would result in change of levels of signals.

2Don’t remove the modules from SSDAC Units under POWER ON condition of

system. Remove module if necessary after switching OFF the power to the Unit.

3Local Address of the CPU-1 and CPU – 2 and configuration settings of the

system should not be changed at the field.

4

The hardware of Communication module and Relay Drive module are similar for all

systems. However their positions of mounting is different in different unit types.

These modules have to be equipped correctly after verifying the drawings as mentioned

in the installation manual (DRG-1 to DRG-4) which indicates their positions

5Caution Board has to be placed near the SSDAC Axle detectors to avoid

damage to theCoils from packing machines


IV&V of Software Highlights

V&V as per CENELAC En50128 by RelQ Software has been completed successfully as below .

Review of Documents as per CENELAC En50128

Review of Source Code as per Coding Standards

White Box Testing for DE, 2D, 3D, 3D-2S, AS

HSI Testing for 2D, 3D, 3D-2S, AS

Regression Testing for 2D, 3D, 3D-2S, AS

Project Closure Reports


Speed-Test using Real-time Wheel Simulator

The SSDAC G-36 speed-test setup along with Tx & Rx DP’s mounted for axle detection at varying speeds from 0 to 250kmph is shown in the figure

The wheel simulator simulates actual train wheel (918mm dia) at varying speeds from 0 to 250Kmph

The speed of wheel simulator was varied from 0 to 250Kmph and axle counts of RPM meter and counts on LCD panel of SSDAC were noted

The RPM counts and wheel counts on LCD panel of SSDAC matched upto max of 9999 counts and at speeds of 5, 50, 150, 200, 225, 250 kmph

ALL SSDAC systems are tested with the Real-time Wheel Simulator and supplied

Tx Rx Coils

Wheel dia 918mm

Odometer

RPM meter


Conclusion

SSDAC-G36 is a rugged system, designed to meet the stringent Railway environment. It can be easily integrated into the family of signaling systems for effortless management of Block and Section proving at stations.

Thank You

ssdac-g36

Documents

ssdac unit

overview ssdacg36

application of ssdac

ssdac event logger card

dp version

block section

error mode dual sensor

single section block