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GOVERNMENT OF INDIA
MINISTRY OF RAILWAYS
Maintenance Handbook on
MEDHA MEI633
Electronic Interlocking System
End Users: Signal Maintenance Personnel of Indian Railways
CAMTECH/S/PROJ/2020-21/SP7/1.0
October 2020
Maharajpur, Gwalior (M.P.) Pin Code – 474 005
i
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ii
Maintenance Handbook on
MEDHA MEI633
Electronic Interlocking System
CAMTECH/S/PROJ/2020-21/SP7/1.0
October 2020
iii
Foreword
Interlocking is an integral part of Railway Signalling, by which functions in a
yard are controlled in a manner that ensures safe passage of the train through the
controlled area. Railway signalling has come a long way from un-interlocked
signalling system, mechanical and electro-mechanical interlocking to the
present day modern signalling. Electronic Interlocking (EI) is one such type of
signalling arrangement which has several advantages over Electro-Mechanical
or Conventional Panel Interlocking. The interlocking logic in the EI System is
based on software and hence any modification is easy without the need for any
wiring changes. The EI System is a processor based system which have
extensive diagnostic tests built into them. This improves the reliability of the
system and leads to minimal system down time even in case of failures.
As there are continuous improvements in technology, we need to keep pace
with the latest trends and keep ourselves updated. Medha MEI633 EI System is
an indigenously developed Electronic Interlocking system and has been
installed on a number of stations of Indian Railways and more number of
installations are likely to be added in future. CAMTECH has prepared this
handbook to get the Signal personnel acquainted with this particular system. I
am confident that this handbook apart from updating the knowledge will help
the field staff in maintenance and troubleshooting of the system.
CAMTECH Gwalior Jitendra Singh
Date: November 02, 2020 Principal Executive Director
iv
Preface
Electronic Interlocking is a microprocessor based system with interface to the
Points, Signals, Track Circuits, Axle Counters, Level Crossing Gates etc.
directly from Control Panel or through Object Controllers. Unlike Electro-
Mechanical or Relay based interlocking, the major portion comprises of
Electronic PCB Modules and has self diagnostic features. Troubleshooting of
an EI System is done with the help of various indications on front facias of
PCBs, Error codes and Maintenance terminal. To ensure flawless performance
of the system, the staff maintaining it should be aware of various modules, their
functions and troubleshooting methods.
CAMTECH has prepared this handbook to help Signal Supervisors and
Maintainers in understanding the basics of Medha MEI633 Electronic
Interlocking System. As earthing, surge protection and power supply play an
important role in the functioning of EI, relevant sections has been added in the
handbook at appropriate places.
We are sincerely thankful to Signal Directorate, RDSO, Lucknow, M/s Medha
Servo Drives Pvt. Ltd., Hyderabad and S&T personnel of Indian Railways who
helped us in preparing this handbook. Since technological upgradation and
learning is a continuous process, you may feel the need for some
addition/modification in this handbook. If so, please give your comments on
email address dirsntcamtech@gmail.com or write to us at Indian Railways
Centre for Advanced Maintenance Technology, In front of Adityaz Hotel,
Airport Road, Near DD Nagar, Maharajpur, Gwalior (M.P.) 474005.
CAMTECH Gwalior Dinesh Kumar Kalame
Date: October 29, 2020 Joint Director (S&T)
v
Table of Contents
Foreword .................................................................................................................................. iii
Preface ...................................................................................................................................... iv
Issue of correction slips ......................................................................................................... vii
Disclaimer .............................................................................................................................. viii
Our Objective .......................................................................................................................... ix
CAMTECH Publications ........................................................................................................ x
Abbreviations .......................................................................................................................... xi
List of Figures ......................................................................................................................... xii
List of Tables ......................................................................................................................... xiv
MEDHA MEI633 Electronic Interlocking System .......................... 1
1. Introduction ................................................................................................................................. 1
1.1 Salient features ........................................................................................................................ 1
1.2 Sub-systems of MEI633 .......................................................................................................... 2
1.3 System operation ..................................................................................................................... 3
2. Functions of sub-systems ............................................................................................................ 4
3. Hardware ..................................................................................................................................... 9
3.1 Sub – Systems of Central Interlocking Unit .......................................................................... 9
3.2 Sub-Systems of Object Controller ...................................................................................... 13
3.3 Sub –Systems of Panel Processor ......................................................................................... 15
4. Functions & Indications of various cards.................................................................................. 17
4.1 Vital Interlocking Computer (VIC ) Card (CVC Card) ........................................................ 17
4.2 Communication Processor (COMP CPU) Card (CCC Card) ............................................... 18
4.3 Communication Interface (CIF) Card ................................................................................... 18
4.4 Voltage & Health Monitoring Card (CVHM ) ...................................................................... 19
4.5 IOCOM CPU Card ................................................................................................................. 20
4.7 WFM Input CPU (OCI) Card ................................................................................................. 22
4.8 WFM Output CPU (OCCO) Card ......................................................................................... 23
4.9 Fail Safe Relay Driver (ORLD) Card ..................................................................................... 24
4.10 Vital Cut Off (OVCO) Card ................................................................................................. 25
4.11 Panel Processor CPU (PPCC) card ....................................................................................... 26
4.12 PP Voltage & Health Monitoring (PVH) card ...................................................................... 27
4.13 Panel Processor Input (PIP) card .......................................................................................... 28
vi
4.14 Panel Processor Output (POP) Card ..................................................................................... 28
4.15 RS485-OFC Bi-directional converter card (Ring Modem) ................................................... 29
4.16 Power Supply (PPSA) Card (For Type A Power Supply) .................................................... 30
4.17 Power Supply (CCPSB) Card (For Type B Power Supply) ................................................. 30
4.18 Power Supply (OPSC) Card (For Type C Power Supply) .................................................... 31
5. Power Supply Arrangements .................................................................................................... 32
5.1 Power Supply Module (PS) ................................................................................................... 32
5.2 Power supply connection details ........................................................................................... 32
5.3 Power cables to be used in MEI633 Installation as per RDSO STS/ E/ TAN/ 3012 dt. 28-08-
15 .................................................................................................................................................. 32
5.4 MEI633 fuse rating particulars ......................................................................................... 33
6. MEI633 System Start Up procedure ........................................................................................ 41
6.1 Initial Checks before Start Up ................................................................................................ 41
6.2 System Power On .................................................................................................................. 42
7. Manual System Changeover ..................................................................................................... 45
8. Maintenance ................................................................................................................................ 46
8. Troubleshooting ........................................................................................................................ 48
8.1 Troubleshooting with help PCB front panel indications ......................................................... 48
8.2 MEI633 Maintenance tools program ...................................................................................... 48
8.3 Troubleshooting through Maintenance Terminal .................................................................... 48
8.4 Troubleshooting through MEI633 Fault Codes ...................................................................... 49
8.5 Trouble shooting serial communication link problems ........................................................... 50
9. Do's & Don'ts .............................................................................................................................. 53
vii
Issue of correction slips
The correction slips to be issued in future for this report will be numbered as follows:
CAMTECH/S/PROJ/2020-21/SP7/1.0# XX date .......
Where “XX” is the serial number of the concerned correction slip (starting from 01
onwards).
CORRECTION SLIPS ISSUED
Sr. No. of
Correction
Slip
Date of issue Page no. and Item
No. modified
Remarks
viii
Disclaimer
It is clarified that the information given in this handbook does not
supersede any existing provisions laid down in the Signal
Engineering Manual, Railway Board and RDSO publications. This
document is not statuary and instructions given are for the purpose
of guidance only. If at any point contradiction is observed, then
Signal Engineering Manual, Telecom Engineering Manual Railway
Board/RDSO guidelines may be referred or prevalent Zonal
Railways instructions may be followed.
ix
Our Objective
To upgrade Maintenance Technologies and Methodologies and achieve
improvement in Productivity and Performance of all Railway assets and
manpower which inter-alia would cover Reliability, Availability and
Utilisation.
If you have any suggestion & any specific comments, please write to us:
Contact person : Jt. Director (Signal & Telecommunication)
Postal Address : Centre for Advanced Maintenance Technology,
Maharajpur, Gwalior (M.P.) Pin Code – 474 005
Phone : 0751 - 2470185
Fax : 0751 – 2470841
Email : dirsntcamtech@gmail.com
x
CAMTECH Publications
CAMTECH is continuing its efforts in the documentation and up-gradation of information on
maintenance practices of Signalling & Telecom assets. Over the years a large number of
publications on Signalling & Telecom subjects have been prepared in the form of handbooks,
pocket books, pamphlets and video films. These publications have been uploaded on the
internet as well as railnet.
For downloading these publications
On Internet:
Visit www.rdso.indianrailways.gov.in Go to Directorates → CAMTECH Gwalior → Other Important links → Publications for
download - S&T Engineering or click on link
https://rdso.indianrailways.gov.in/view_section.jsp?lang=0&id=0,2,17,6313,6321,6326
On Railnet:
Visit RDSO website at 10.100.2.19
Go to Directorates → CAMTECH → Publications → S&T Engineering Or click on the link
http://10.100.2.19/camtech/Publications/CAMTECH%20Publications%20Online/SntPub.htm
A limited number of publications in hard copy are also available in CAMTECH library which
can be got issued by deputing staff with official letter from controllong officer. The letter
should be addressed to Director (S&T), CAMTECH, Gwalior.
For any further information regarding publications please contact:
Director (S&T) – 0751-2470185 (O)(BSNL)
SSE/Signal - 7024141046 (CUG)
Or
Email at dirsntcamtech@gmail.com
Or
FAX to 0751-2470841 (BSNL)
Or
Write at
Director (S&T)
Indian Railways Centre for Advanced Maintenance Technology,
In front of Hotel Adityaz, Airport Road, Maharajpur,
Gwalior (M.P.) 474005
xi
Abbreviations
Abbreviation Description
AC Alternating Current
BRC Bonded Ring Configuration
CB Counter Box
CCIP Command Cum Indication Panel
CIU Central Interlocking Unit
CPU Central Processing Unit
CT Cable Termination
DB Distribution Box
DC Direct Current
DL Data Logger
EI Electronic Interlocking
EMI Electromagnetic Interference
FMC Fan Monitoring Card
FPD Front Panel Display
FTOT Field Termination Output Termination
IPS Integrated Power Supply
I/O Input/Output
LA Lightning Arrester
LED Light Emitting Diode
MEEB Main Equi-potential Earth Busbar
MT Maintenance terminal
OC Object Controller
OCM Object Controller Module
OFC Optical Fibre Communication
PC Personal Computer
PCB Printed Circuit Board
PP Panel Processor
RDSO Research Designs & Standards Organisation
SEEB Sub Equi-potential Earth Busbar
SM Station Master
SPD Surge Protection
UG Underground
USB Universal Serial Bus
VCOR Voltage Cut Off Relay
VDU CT Video Display Unit Control Terminal
xii
List of Figures
Figure 1: Two out of Two Architecture .................................................................................................... 1
Figure 2: Two out of Two System with Hot Standby ............................................................................... 2
Figure 3: MEI633 Sub Systems ................................................................................................................ 3
Figure 4: Medha MEI633 EI System Block Diagram ................................................................................ 4
Figure 5: Central Interlocking Unit .......................................................................................................... 4
Figure 6: Block diagram of Object Controller .......................................................................................... 5
Figure 7: Object Controller ...................................................................................................................... 5
Figure 8 : Control Cum Indication Panel .................................................................................................. 6
Figure 9: Panel Processor ........................................................................................................................ 6
Figure 10 : Counter Box ........................................................................................................................... 7
Figure 11 :VDU CT ................................................................................................................................... 7
Figure 12 : Front Panel Display ............................................................................................................... 8
Figure 13 : Maintenance Terminal .......................................................................................................... 8
Figure 14 : Data Logger ........................................................................................................................... 8
Figure 15 : Sub - Systems of Central Interlocking Unit ............................................................................ 9
Figure 16 : Central Interlocking Unit Bottom Bin .................................................................................. 10
Figure 18 : Front Panel Display (FPD) .................................................................................................... 11
Figure 17 : Central Interlocking Unit Top Bin ........................................................................................ 11
Figure 19 : Ports of Central Interlocking Unit ........................................................................................ 12
Figure 20: Sub - Systems of Object Controller ...................................................................................... 13
Figure 21 : Object Controller Rack Bottom Bin ..................................................................................... 14
Figure 22 : Object Controller Rack Top Bin............................................................................................ 14
Figure 23 : VCOR QN Series ................................................................................................................... 15
Figure 24 : Panel Processor Rack Bottom Bin ....................................................................................... 16
Figure 25 : Panel Processor Rack Top Bin.............................................................................................. 16
Figure 26 : VIC Card Front display ......................................................................................................... 17
Figure 27 : CCC Card Front display ........................................................................................................ 18
Figure 28: CIF Card Front display .......................................................................................................... 18
Figure 29 : CVHM Card Front display .................................................................................................... 19
Figure 30 : IOCOM Card Front display ................................................................................................... 20
Figure 31: OVH Card Front display ........................................................................................................ 21
Figure 32: OCI Card Front display.......................................................................................................... 22
Figure 33: OCCO Card front display ...................................................................................................... 23
Figure 34: ORLD Card Front display ...................................................................................................... 24
Figure 35 : OVCO Card Front display ..................................................................................................... 25
Figure 36 : PPCC Card Front display ...................................................................................................... 26
Figure 37 : PPVH Card Front display ..................................................................................................... 27
Figure 38 : PPIP Card Front display ....................................................................................................... 28
Figure 39 : PPOP Card Front display...................................................................................................... 28
Figure 40 : RS485 OFC Bi-Directional Converter Card Front display ..................................................... 29
Figure 41 : PPSA Card front display ....................................................................................................... 30
Figure 42 : CCPSB Card Front display .................................................................................................... 30
xiii
Figure 43 : OPSC Card Front display ...................................................................................................... 31
Figure 44 : Power Supply connection details for Central Interlocking Unit Module ............................ 34
Figure 45 : Power Supply connection details for Object Controller Module ......................................... 34
Figure 46 : Power Supply connection details for Object Controller Module ......................................... 35
Figure 47 : Power Supply connection details for Panel Processor Module ........................................... 35
Figure 48 : MEI633 Power Distribution for 110 V DC Supply ................................................................ 37
Figure 49 : MEI633 Power Distribution for 230 V AC Supply ................................................................. 38
Figure 50 : Medha MEI633 EI Power Supply Scheme as per RDSO Technical Advisory Note no. 3012
Ver 2.0 dt. 22.08.2016 ........................................................................................................................... 39
Figure 51: General Block diagram of Power Supply distribution of Medha MEI633 Electronic
Interlocking System ............................................................................................................................... 40
Figure 52 : Counter Box Indications ...................................................................................................... 44
Figure 53 : Manual changeover through CVHM Card ........................................................................... 45
Figure 54 : Flowchart for Medha MEI633 EI Input Relay Failure Troubleshooting ............................... 51
Figure 55 : Flowchart for Medha MEI633 EI Output Relay Failure Troubleshooting ............................ 52
xiv
List of Tables
Table 1 : Central Interlocking Unit Rack – (Bottom Bin)....................................................................... 10
Table 2: Central Interlocking Unit Rack - (Top Bin)............................................................................ 10
Table 3: Central Interlocking Unit Rack – (Front Panel Display) – 2 Nos............................................11
Table 4: Object Controller Rack – OC (Bottom Bin).............................................................................. 13
Table 5: Object Controller Rack –OC (Top Bin)..................................................................................... 14
Table 6: Panel Processor Rack – MPP (Bottom Bin)..............................................................................15
Table 7 :Panel Processor Rack – MPP (Top Bin).................................................................................... 16
Table 8: CVC Indications..................................................................................................................... 17
Table 9: CCC Indications....................................................................................................................... 18
Table 10 : CIF Indications..................................................................................................................... 18
Table 11: CVHM Indications.................................................................................................................19
Table 12 :IOCOM Indications................................................................................................................ 20
Table 13: OVH Indications.................................................................................................................... 21
Table 14: OCI Indications...................................................................................................................... 22
Table 15: OCCO Indications.................................................................................................................. 23
Table 16: ORLD Indications................................................................................................................... 24
Table 17 :OVCO Indications................................................................................................................. 25
Table 18: PPCC Indications................................................................................................................... 26
Table 19 : PPVH Indications.................................................................................................................. 27
Table 20 :PPIP Indications..................................................................................................................... 28
Table 21: PPOP Indications.................................................................................................................. 28
Table 22 : Converter Card Indications.................................................................................................. 29
Table 23 :PPSA Indications................................................................................................................... 30
Table 24 : CCPSB Indications................................................................................................................ 30
Table 25 :OPSC Indications................................................................................................................... 31
Table 26 : Power Cable particulars....................................................................................................... 32
Table 27 : Fuse ratings for Equipments................................................................................................ 33
Table 28 : Fuse ratings for Distribution Box......................................................................................... 33
Table 29 : Monthly Maintenance Schedule.......................................................................................... 46
xv
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CAMTECH/S/PROJ/2020-21/SP7/1.0 1
Medha MEI633 Electronic Interlocking October 2020
MEDHA MEI633 Electronic Interlocking System
1. Introduction
MEI633 is a microprocessor based system with interface to the Points, Signals, Track
Circuits, Axle Counters, Level Crossing Gates, Ground Frames, Block Instruments for Block
working with adjacent stations, and crank handles for manual operation of Points. It has the
provision to interface with an External Data Logger through Serial Link to log events.
MEI633 is a self-contained independent system, which can be used standalone to control the
train movement in the Yard. MEI633 system conforms to RDSO Specification No.
RDSO/SPN/192/2005.
1.1 Salient features
MEI633 system can be installed as a centralized system or a distributed system.
Substantial cost savings can be achieved by using optical fibre communication cable in
place of signalling cable for distributed system.
MEI633 system implements Two-out-of-Two Hardware architecture with identical
Hardware and identical Software for Vital modules.
MEI633 provides Hot Stand-by with automatic changeover for all modules, except the
field modules.
Figure 1: Two out of Two Architecture
CAMTECH/S/PROJ/2020-21/SP7/1.0 2
Medha MEI633 Electronic Interlocking October 2020
Figure 2: Two out of Two System with Hot Standby
The number of Object Controllers, the number of Input and Output WFMs in each OC,
and the Input and Output modules required for the Panel Processor can be selected as
per the Yard I/O requirement.
The number of Object Controllers, the number of Input and Output WFMs in each OC,
and the Input and Output modules required for the Panel Processor can be selected as
per the Yard I/O requirement.
MEI633 system operates on a cycle time basis, where the Interlocking equations are
executed every cycle. Accidental usage of stale data is avoided.
MEI633 system is capable of handling the Yards up to 350 routes.
1.2 Sub-systems of MEI633
The MEI633 comprises of the following sub-systems:
(a). Central Interlocking Unit (CIU)
(b). Object Controllers (OC)
(c). Panel Processor Unit (PP)
(d). Power Supply Module
(e). Control Cum Indication Panel (CCIP)
(f). Counter Box Module
(g). Data Logger (DL)
(h). Video Display Unit Control Terminal(VDU CT )
(i). Maintenance Terminal (MT)
(j). Front Panel Display Unit (FPD)
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Medha MEI633 Electronic Interlocking October 2020
Figure 3: MEI633 Sub Systems
1.3 System operation
The major building blocks of MEI633 are Central Interlocking Unit (CIU), Object
Controller Modules (OCM) and Panel Processor (PP).
Cycle time of MEI633 is 333 ms.
The actual state of the yard is displayed on CCIP/VDU CT.
CIU collects the Yard information from OCMs and operator commands from PP/CCIP
/VDU CT.
CIU validates and executes interlocking equations based on the available information
from field units and received commands from CCIP/VDU CT.
The outcome of the equation execution is the OCM output data and PP/VDU CT
indication data.
OCM output data is used to drive the output relays. Driving an output relay generally
clears a signal or operates a point.
In other words, CIU generated field outputs, are transmitted to field modules, and
indication output is transmitted to PP/VDU CT.
CAMTECH/S/PROJ/2020-21/SP7/1.0 4
Medha MEI633 Electronic Interlocking October 2020
Figure 4: Medha MEI633 EI System Block Diagram
2. Functions of sub-systems
Central Interlocking Unit (CIU)
Central Interlocking Unit (CIU) Performs the Vital Interlocking functions and Communicates
with the other Sub-Systems. It consists of VIC, COMP, CIF and VHM cards, which are
enclosed in a single box. Input data from PP/VDU CT Modules, OCMs is received by CIU.
The received input data is processed for interlocking by CIU and output data is generated
based on the input data. The respective output data is sent to PP/VDU CT Modules, Counter
Box, MT and OCMs.
Figure 5: Central Interlocking Unit
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Medha MEI633 Electronic Interlocking October 2020
Object Controller Module (OCM)
Object Controllers acquire the Vital Field Input Data and drive the Vital Field Outputs. The
Object Controller Module (OCM) consists of two IOCOMs namely IOCOM-A, IOCOM-B
and a maximum of 8 WFMs. There can be at most 32 OCMs in a system. WFMs are
connected to IOCOM-A and IOCOM-B through RS485 interface. IOCOM-A and IOCOM-B
are connected to COMP-A and COMP-B respectively, through OFC interface. Input WFM
gets the status of the wayside functions in the yard. Output WFM receives the wayside
function output data from CIU through IOCOMs and drives the wayside functions connected
to it. Each Input WFM can read at most eight wayside function inputs and each Output WFM
can drive at most 8 wayside function outputs.
Figure 6: Block diagram of Object Controller
Figure 7: Object Controller
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Medha MEI633 Electronic Interlocking October 2020
Command Cum Indication Panel (CCIP)
CCIP consists of Push Buttons/Knobs, Keys, LEDs and Buzzers. Push Buttons/Knobs are
used to issue commands to System. Keys on CCIP can be in, Key In/Key Out position to
enable/disable processing of the commands issued by operator to System. LEDs on CCIP
indicate the yard status e.g. colour light signal on/off status, point position and track
occupation status. Buzzers are used to indicate the Button stuck condition or signal blank
condition. CCIP is connected to PP Modules through Input and Output Cards. PP module’s
link status with CIU and its Health status are indicated on CCIP.
Figure 8 : Control Cum Indication Panel
Panel Processor (PP)
Panel Processor module consists of two Panel Processors and each is connected to a common
set of Input and Output cards through parallel interface. On the other hand, each Panel
Processor is connected to COMP through Optical Fiber Interface. Each Panel Processor scans
the state of the inputs on CCIP through Input cards, and sends the same to VICs via the
respective COMP. Each of them receives Indication Information from Active VIC and drives
the same to CCIP through output cards, providing visual indication to operator. Indication
Information represents the current Yard status.
Figure 9: Panel Processor
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Medha MEI633 Electronic Interlocking October 2020
Power Supply Module (PS)
MEI633 uses three types of Power Supply modules viz, Type A, Type B and Type C Power
supplies. These power supplies are designed specifically to meet the requirements of various
cards in the CIU, OC and PP modules. All the three types take +24V as input.
M633PSA-01 O/p: 4.5V @ 8A --------- ( in PP )
M633PSB-01 O/p: 4.5V @ 3A --------- ( in OC & CIU , PP,CB)
M633PSC-01 Dual Output type –O/p-1: 4.5V@6A, O/p-2: 5.8V @2A (in OC)
Counter Box
Counter Box consists of CPU card and Output card. Output card is used to drive the counters
and buzzers. CPU card is connected to Output card and on the other end it is connected to
COMP-A and COMP-B, through Optical Fiber Interface. CPU card receives messages from
both COMPs. Ultimately it takes data to drive counters and buzzers from the Active COMP
channel. Counter Box module also indicates VIC-A and VIC-B status (Active, Standby and
Not Available), wrong side failure information from OC and CIU by the corresponding
LEDs.
Video Display Unit Control Terminal (VDU CT)
Video Display Unit Control Terminal (VDU CT) is a
PC based application Software. VDU CT is connected
to CIU through OFC interface. Operator can issue
commands using the simulated buttons on the VDU
CT screen. It sends the command and receives the yard
status from COMP and displays the same on the VDU
CT screen. With a redundant VDU CT arrangement,
CCIP and PP can be eliminated and thus achieving substantial
cost-effectiveness.
Figure 10 : Counter Box
Figure 11 :VDU CT
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Medha MEI633 Electronic Interlocking October 2020
Front Panel Display (FPD)
LED Display is connected to CIU through RS232 interface. The system consists of two units,
namely Display-A and Display-B. They are used to display the system faults/recovery
messages.
Figure 12 : Front Panel Display
Maintenance Terminal (MT)
MT (Maintenance Terminal) is a PC based application
Software. MT is connected to CIU through RS232-OFC
Interface. MT screen shows the status of the system, logs the
events/faults received from CIU and generates alarm signal
if any critical fault is received from the CIU. Proprietary
serial communication protocol is used for communication
between CIU and MT. Diagnostic facility is available from
the MT in easily understandable language. Facility or replay
of recorded events through MT for offline analysis is
available.
Data Logger (DL)
Data Logger (DL) is a device connected to CIU through RS232-OFC interface. DL is used to
log the yard and system status in every cycle. Proprietary serial communication protocol is
used for communication between CIU and Data Logger.
Figure 13 : Maintenance
Terminal
Figure 14 : Data Logger
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Medha MEI633 Electronic Interlocking October 2020
3. Hardware
The hardware for MEI633 can be divided broadly into the following three modules:
Central Interlocking Unit
Object Controller Module
Panel Processor Module
Each Module further consists of two sub-systems that are physically arranged in two separate
mechanical enclosures that can be stacked one over the other. Each sub-system is housed in
standard 19” racks (with the exception to PP which is housed in 27” rack). Each enclosure
houses individual PCBs pertaining to a logical sub-system of MEI633.
3.1 Sub – Systems of Central Interlocking Unit
Figure 15 : Sub - Systems of Central Interlocking Unit
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Medha MEI633 Electronic Interlocking October 2020
Table 1 : Central Interlocking Unit Rack – (Bottom Bin)
PCB Name Qty Basic Function(s)
CIU Bottom Backplane 1 Mother board for the CPU, CIF and VHM cards
Vital Interlocking Computer
card (CVC card or VIC Card)
2 Performs the vital interlocking and indication
logic computation
Communication Processor
card (CCC CPU card or
COMP CPU Card)
2 Bridges the field modules and PP with the Vital
Interlocking computer through serial
interface
Communication Interface
card (CIF card)
2 CIF Card provides Isolated, Full Duplex RS485
Interface to the Communication Processor Card
in the CIU module.
CIU Voltage and Health
Monitoring card (CVHM
card)
2 Monitors the voltage and health of COMP
(CCC) and CVC (VIC) cards
Figure 16 : Central Interlocking Unit Bottom Bin
Table 2: Central Interlocking Unit Rack - (Top Bin)
PCB Name Qty Basic Function(s)
CIU Top Backplane 1 Mother board for the Power supply cards
Power Supply Type B
4.5V@3A
4 To provide power to COMP CPU cards (2
no.s) and VIC cards (2 no.s)
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Medha MEI633 Electronic Interlocking October 2020
Table 3: Central Interlocking Unit Rack – (Front Panel Display) – 2 Nos.
PCB Name Qty Basic Function(s)
Front Panel Display Card 1 To display Fault codes and System status
messages received from SVP
Figure 18 : Front Panel Display (FPD)
Figure 17 : Central Interlocking Unit Top Bin
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Medha MEI633 Electronic Interlocking October 2020
Ports Connected to CIU (For Ch-A and Ch-B each) :
CIU has 12 serial communication ports
• 8 ports are used for 32 OCMs (on each port, a max 4 OCMs can be connected)
• 1 port is used for PPs and VDUs (Max.4 PPs and/or 4 VDUs can be connected)
• 3 ports for OEIS/CTC/MSDAC/TCAS/ any ATP system
(1- port is reserved for OEIS, 1- port is reserved for CTC, 1 port remaining is used for
future use)
CIU also connected to MT, DL,CB,& FPD
Figure 19 : Ports of Central Interlocking Unit
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Medha MEI633 Electronic Interlocking October 2020
3.2 Sub-Systems of Object Controller
Figure 20: Sub - Systems of Object Controller
Table 4: Object Controller Rack – OC (Bottom Bin)
PCB Name Qty Basic Function(s)
OC Bottom Backplane 1 Mother board for the WFM cards
Input Wayside Function
Module CPU Card OCCI
(Input WFM CPU Card)
5 (Max.) Reads the status of input relays
Output Wayside Function
Module Output Card
OCCO (Output WFM CPU
Card)
3 (Max.) Drives the field output relays through
the Relay Driver card
WFM Relay Driver Card
(ORLD Card)
3 (Max.) Drives the field output relays in a fail-
safe manner
Vital Cut-off Card (OVCO
Card)
1 Monitors the health of Output WFM
CPU cards
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Figure 21 : Object Controller Rack Bottom Bin
Table 5: Object Controller Rack –OC (Top Bin)
PCB Name Qty Basic Function(s)
OC Top Backplane 1 Mother board for the CPU, CIF
& VHM cards
OICC - IO Communication
Processor Card (IOCOM CPU
card)
2 Transfers information between
COMP and WFMs
OPSB - Power Supply Type B
O/p: 4.5V @ 3A
2 To provide power to IOCOM
CPU cards (2 Nos.)
OPSC - Power Supply Type C
Dual O/P– O/p-1: 4.5V @ 6A
O/p-2: 5.8V @ 2A
2 To provide power to WFM
CPU cards (2 Nos.)
OVH - OC Voltage and Health
Monitoring card
2 Monitors the Voltage and
Health of IOCOM CPU card
Figure 22 : Object Controller Rack Top Bin
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3.2.1 Object Controller Voltage Cut-Off Relay (VCOR)
Each OC has a Vital Cut-Off Relay (VCOR) to power Vital Output functions connected
to that OC.
Primary Negation is triggered by dropping VCOR, in case of a Wrong Side Failure. Thus
forcing all the Vital Output functions connected to that OC in to Safe State.
Secondary Negation: In cases, where VCOR is not getting dropped and still WSF
persists, CIU will shut-down and forcing safe state in whole yard.
Capacity of OC Rack
Single OC Rack can handle upto 64 I/Os
Each Card consists of 8 Bits
i.e. 5 X 8 = 40 I/Ps, 3 X 8 = 24 O/Ps, Total I/Os = 64
Twin Racks can handle 128 I/Os
i.e. 10 X 8 = 80 I/Ps, 6 X 8 = 48 O/Ps, Total I/O=128
3.3 Sub –Systems of Panel Processor
Table 6: Panel Processor Rack – MPP (Bottom Bin)
PCB Name Qty Basic Function(s)
PP CPU Backplane 1 Mother board for the CPU,
PVH, PSB and PExD cards
PP CPU card 2 Scans the CCIP buttons and
drives the indication
Power Supply Type B 2 To provide power to the PP
CPU cards (2 Nos.)
PP Extender Driver Card 2 (Max.) Interface between the CPU
backplane and IO backplane
PP Voltage and Health
Monitoring card (PVH
card)
2 Monitors the Voltage and
Health of PP CPU card
Figure 23 : VCOR QN Series
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Figure 24 : Panel Processor Rack Bottom Bin
Table 7 :Panel Processor Rack – MPP (Top Bin)
PCB Name Qty Basic Function(s)
PP IO Backplane 4 Mother board for PExR, PP Input
and Output cards
PP Extender
Receiver Card
4 Interface between the CPU
backplane and IO backplane
PP Input Card 11 Interface card for scanning the
CCIP buttons
PP Output Card 38 Interface card for driving the
CCIP indication outputs
Power Supply
Card -A 4.5V@8A
8 To provide power to PExR, PP
Input and Output cards
Capacity of Non-Vital I/O Card - 64 bits, It can handle 672 inputs + 2400 outputs = 3072
Figure 25 : Panel Processor Rack Top Bin
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4. Functions & Indications of various cards
4.1 Vital Interlocking Computer (VIC ) Card (CVC Card)
Nameplate: CVC-A and CVC-B
Functions
1. VIC card receives the inputs from OCMs, PP Modules, VDUs, OEIS, and CTC, and
sends the output to the Communication Module.
2. It performs Vital Interlocking and Indication Logic Computation and Supervisory
processor checks.
3. It has a Serial Communication Interface with MT for sending the Data Log and System
Health information.
4. It is designed as a Dual Electronic Structure based on composite fail-safety with fail-safe
comparison.
Table 8: CVC Indications
Indication/Interface Description
LED (POWER) Availability of input power to the card
Dual digit 7
segment display
Visual indication of fault-codes
LED (CYC) Cyclic activity status of SVP. Toggled every
cycle
LED (ACT) VIC is in active mode
LED (STD BY) VIC is in standby mode
LED (MRST) Provided for future use
LEDs (COM A and
COM B)
Active status of COMP A and COMP B
respectively
9 Pin D-Female
Connector (RS232)
Used for Data Logger, Maintenance Terminal
and Front Panel Display communication during
normal operation and for Application Data
download during offline mode.
Figure 26 : VIC
Card Front display
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4.2 Communication Processor (COMP CPU) Card (CCC Card)
Nameplate: CCC-A and CCC-B
Functions
1. COMP CPU card transmits and receives vital data.
2. It receives vital inputs from various IOCOMs, commands from Panel
processor, slots from any other SSI (if connected) and commands
from the CTC through various serial interfaces.
3. It receives the output messages through the DPRAMs and transmits
these messages to the respective destinations.
4. Provision is provided in card for connecting to PC parallel port for
Programming and debugging interface.
Table 9: CCC Indications
Indication/Interface Description
LED (POWER) Availability of input power to the card
Dual digit 7 segment
display
Visual indication of fault-codes
LED (CYC)
Cyclic activity status of COMP. Toggled
every cycle
LEDs (VIC A and VIC B) Active status of VIC A and VIC B
respectively
9 pin Female connector
(RS 232)
Used for Debug port & Application data
download during offline mode
4.3 Communication Interface (CIF) Card Nameplate: CIF-A and CIF-B
Functions
1. The CIF card facilitates conversion of TTL communication signals
(Tx, Rx and RTS) to RS485 signals.
2. It provides an Isolated RS485 Full Duplex communication interface
to the serial channels.
3. Each Card can support six or twelve channels depending upon the
system configuration.
4. The Rx, Tx and the RTS signals of all the channels are provided with
protection against overvoltage and surges.
5. It facilitates the COMP CPU card to check whether the CIF card is
present and is powered or not.
Table 10 : CIF Indications
Indication/Interface Description
LED (POWER) Availability of input power to the card
Two 50 pin D type
connectors
Provides full duplex RS485 interface with
communication processor card
Figure 27 : CCC Card Front display
Figure 28: CIF Card Front display
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4.4 Voltage & Health Monitoring Card (CVHM )
Nameplate: CVHM-A and CVHM-B
Functions
1. CVH Card generates Power Good signal if all the voltages are within predefined limits
2. It monitors the status of the COMP CPU and SVP CPU activities and indicates health of
CPU.
3. In case of the voltages going beyond limits or the CPU activity being not correct it shuts
down the power input to the corresponding CPU.
4. CPU Health monitoring is performed by pattern check, pattern struck, reset count, reset
struck and shunt down command.
5. LED indications are provided for Power ON, VIC Voltage within limits, VIC Health
Status, COMP Voltage within limits, COMP Health Status, VIC power cut-off and
COMP power cut-off.
Table 11: CVHM Indications
Indication/Interface Description
LED (POWER) (Amber) Availability of input power to the CVH card
LED (VIC VS)
Glows Green:
VIC card voltages monitored by the Power
Manager are within predefined limits
Glows Red:
Any of the VIC card voltages monitored by the
Power Manager has gone beyond limits.
LED (VIC HS)
Glows Green and starts blinking:
VIC CPU Health OK
Glows Red:
VIC CPU Health Not OK
LED (VIC CO)
Glows Green:
CPU is operating normally
Glows Red:
CPU Power is cut-off by the VHM card.
LED (COM VS)
Glows Green:
COMP voltages monitored by the Power Manager
are within predefined limits.
Glows Red:
Any of the COMP voltages monitored by the Power
Manager has gone beyond limits.
LED (COM HS)
Glows Green and starts blinking:
COMP Health OK
Glows Red:
COMP Health Not OK
LED (COM CO)
Glows Green: CPU is operating normally
Glows Red: CPU Power is cut-off by the VHM
card
Push button (VIC SD) When pressed power manager turns OFF the Power
supply to VIC card
Push button (VIC ON) When pressed power manager turns ON the Power
supply to VIC and continues to function
normally.
Push button (COM SD) When pressed power manager turns OFF the Power
supply to COMP
Push button (COM ON) When pressed power manager turns ON the Power
supply to COMP and continues to function
normally
Figure 29 : CVHM
Card Front display
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4.5 IOCOM CPU Card Nameplate: OICC-A and OICC-B Functions 1. IOCOM CPU card transfers data between the Communication Processor and the
Wayside Function modules.
2. It receives the input messages from WFP and sends output messages to COMP.
3. It has provision for BDM/JTAG for connecting to PC parallel port for Programming and
debugging interface.
Table 12 :IOCOM Indications
Indication/Interface Description
LED (POWER) Availability of power to the card
Dual digit 7 segment display Visual indication of fault-codes
LEDs (WFP TX and WFP RX) Transmission and reception of data from
WFP’srespectively
LED (CYC) Status of cyclic activity of the CPU.
LEDs (COM TX and COM RX) Transmission and reception of data from
COMP card respectively
15 Pin Male Connector (RS485) Provides serial communication between the
OIC card and COMP card.
Figure 30 : IOCOM Card Front display
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4.6 OC Voltage & Health Monitoring (OVH) Card
Nameplate: OVH-A and OVH-B
Functions
1. OVH card generates Power Good signal if all the monitoring voltages are within limits.
2. Shuts down the power input to CPU in case of the monitoring voltages going beyond
limits or the CPU activity not being correct.
3. It monitors the status of the IOCOM CPU activity and indicates the status of CPU health.
Table 13: OVH Indications
Indication/Interface Description
LED (POWER)
(Amber)
Availability of power to the OVH card
LED (V. STS)
Glows Green:
All the monitoring voltages are within predefined limits.
Glows Red:
Any of the monitoring voltage has gone beyond limit.
LED (H. STS)
Glows Green: IOCOM CPU Health OK
Glows Red: IOCOM CPU Health Not OK
LED (CUT. OFF)
Glows Green: Card is operating normally
Glows Red: IOCOM CPU power is cut off by OVH card.
Push Button
(RESET)
When pressed, OVH Card ON the power to the OIC card when
it is in OFF condition
Figure 31: OVH Card Front display
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4.7 WFM Input CPU (OCI) Card
Nameplate: OCCI-1, OCCI-2, OCCI-3, OCCI-4 and OCCI-5
Functions
1. OCI Card scans the state of the input relays.
2. It frames the input data based on the state of the connected input relays. The framed
input data is sent to IOCOM when they requested.
3. It indicates Input Relay connect status which is a Yard specific configuration setting.
Table 14: OCI Indications
Indication/Interface Description
LED (POWER) (Amber) Availability of power to the card
LEDs (B TX1 and B TX0)
(Amber blinking)
Slave CPU status of communication with IOCOM-B
CPU and IOCOM-A CPU respectively.
LED (B STS) (Green blinking) Status of cyclic activity of the Slave CPU
LED (A STS) (Green blinking) Status of cyclic activity of the Master CPU
LEDs (A TX1 and A TX0)
(Amber blinking)
Master CPU status of communication with IOCOM-
B, CPU and IOCOM-A CPU respectively
LEDs (IP1 to IP8)
(Relay Picked up -Green)
Relay Dropped - Not glowing)
Input Relay State (Picked Up/Dropped)
Figure 32: OCI Card Front display
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4.8 WFM Output CPU (OCCO) Card
Nameplate: OCCO-1, OCCO-2 and OCCO-3
Functions
1. OCCO card receives Output relay drive data from IOCOMs
and drives the relays.
2. It reads the Output Relay contact states to know whether the
Output relays are in their commanded state.
3. It sends the read back data to IOCOMs.
4. It indicates Input Relay connect status which is a Yard
specific configuration setting.
5. It performs self-test at power ON to detect any possible
errors.
Table 15: OCCO Indications
Indication/Interface Description
LED (POWER) (Amber) Availability of power to the card
LEDs (B TX1 and B TX0)
(Amber blinking)
Slave CPU status of communication with IOCOM-B CPU
and IOCOM-A CPU respectively.
LED (B STS) (Green blinking) Status of cyclic activity of the Slave CPU
LED (A STS) (Green blinking) Status of cyclic activity of the Master CPU
LEDs (A TX1 and A TX0)
(Amber blinking)
Master CPU status of communication with IOCOM-B CPU
and IOCOM-A CPU respectively.
Figure 33: OCCO Card front display
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4.9 Fail Safe Relay Driver (ORLD) Card
Nameplate: ORLD-1, ORLD-2 and ORLD-3
Functions
1. It can drive 8 External QN Type Fail-Safe Relays.
2. When the relay is to be driven it supplies 24V to the
external relays.
3. It has reverse voltage, high voltage protection and
against shorting of the drive signal.
4. Power input from two external power supplies for
redundancy.(Provided from the power supply cards)
5. Optical isolation is provided by Opto-couplers and
Galvanic isolation by transformers between the WFM
and external relays.
Table 16: ORLD Indications
Indication/Interface Description
LED (POWER) (Red) Availability of vital power to the relays
LEDs (OP1 - OP8)
Drive status of the eight relays
Glows Orange:
Relay connected to that particular section is driven
Glows Red:
Drive signal is present but the relay is not driven as the fuse is
blown due to over load condition
Glows Green:
External feed to the Relay during the fuse blown out condition
Figure 34: ORLD Card Front display
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4.10 Vital Cut Off (OVCO) Card
Nameplate: OVCO
Functions
1. OVC card monitors the voltage outputs (+3.3 V) of the
regulators on the WFP Output CPU cards and indicates
whether the voltages are within permissible limits.
2. It monitors the status of the Output WFP CPU activity and
indicate the CPU health status.
3. It shuts down the power to the external relays in case of the
voltages going beyond limits or the CPU activity not being
correct.
4. Power Input +24 V DC (On board DC-DC Converter
generates the required voltages.
Table 17 :OVCO Indications
Indication/Interface Description
LED (POWER)
(Amber)
Availability of input power to the
Vital Cut-off card.
LED (VCOR)
(Amber)
Vital Cut-off relay is being driven
by the CPLDs
LED (STS A)
(Green blinking)
Starts Blinking:
All the ‘A’ CPUs sends correct
status pattern and the
status of all the ‘A’ CPUs is OK
LED (STS B)
(Green blinking)
Starts Blinking:
All the ‘B’ CPUs sends correct
status pattern and the
status of all the ‘B’ CPUs is OK
LEDs (OP1 to OP3)
(Green)
They are driven by CPLD B and
represent the connect
status of Output WFM card 1, 2 and
3.
LED (VCOR
POWER)
VCOR drive power is available to
OVC card.
Figure 35 : OVCO
Card Front display
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4.11 Panel Processor CPU (PPCC) card
Nameplate: PPCC-A and PPCC-B
Functions
1. PCC card scans the state of the buttons on CCIP and sends the same to COMP.
2. It receives the indication data from COMP and drives the indication LEDs on the
Command cum Indication Panel.
3. Provision for BDM/JTAG is provided for connecting to PC parallel port for
Programming and debugging interface.
Table 18: PPCC Indications
Indication/Interface Description
LED (POWER) Availability of the power to the card
Dual digit 7-
segment display
Visual indication of fault codes
LED (CYC)
Status of cyclic activity of the CPU
LED (OE)
Reception of Password from the COMP for
driving the output cards
LEDs (COM Rx
and COM Tx)
Status of communication with COMP
15 pin Female
connector
(RS232)
Provides external communication interfaces
for serial ports with RS232 levels
15 pin Male
connector
(RS485)
Provides RS485 communication interface
with RS485-OFC Bi-directional converter
Figure 36 :
PPCC Card
Front display
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4.12 PP Voltage & Health Monitoring (PVH) card
Nameplate: PPVH-A and PPVH-B
Functions
1. PVH card generates Power Good signal if all the monitoring
voltages are within limits.
2. It monitors the status of the PP CPU activity and indicates the
CPU health status.
3. It shuts down the power input to the CPU in case of the
voltages going beyond limits or the CPU activity being not
correct.
Table 19 : PPVH Indications
Indication/Interface Description
LED (POWER) Availability of input power to the PVH card
LED (V.STS)
Glows Green: All the voltages monitored by the Power
Manager are within limits
Glows Red: Any of the voltage monitored by the Power
Manager has gone beyond limit.
Third LED (H.STS)
Glows Green: PP CPU Health OK
Glows Red: PP CPU Health Not OK
Fourth LED
(Cut Off)
Glows Green: CPU is operating normally
Glows Red: CPU Power is cut-off by the VHM card
Push-button switch
(RESET)
When pressed, VHM card restarts the PP CPU card when it is
in Power OFF condition.
Figure 37 : PPVH Card Front display
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4.13 Panel Processor Input (PIP) card
Nameplate: PPIP-1
Functions
1. PIP card
2. facilitates the scanning of the buttons on the CCIP by the PP
CPU card.
3. It has a provision to interface with two PP CPU cards at the same
time.
4. Maximum of 64 PIP cards can be accommodated in a system.
Table 20 :PPIP Indications
Indication/Interface Description
LED (POWER) Availability of the power to the card
Two 37 pin D-Male
Connectors
Provides external communication interfaces
for 64 inputs coming from the CCIP
4.14 Panel Processor Output (POP) Card
Nameplate: PPOP-1
Functions
1. POP card facilitates the driving of indication outputs on the
CCIP by the PP CPU card.
2. It has a provision to interface with two PP CPU cards at the
same time but drives the CCIP indications with the data sent by
only one CPU card at any instant of time.
3. Maximum of 64 Output cards can be accommodated in a
system.
Table 21: PPOP Indications
Indication/Interface Description
LED (POWER) Availability of the power to the card
Two 37 pin D-Male
Connectors
Provides external communication interfaces
for 64 inputs coming from the CCIP
Figure 38 : PPIP Card Front display
Figure 39 : PPOP Card Front display
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4.15 RS485-OFC Bi-directional converter card (Ring Modem)
Table 22 : Converter Card Indications
Indication/Interface Description
LED (POWER) (Amber)
Availability of input power to CPLD / OFC section of the
card
LED (POWER) (Amber)
Availability of input power to RS485 section of the card
LED (PTX) (Amber blinking) Data transmitting through primary channel
LED (PRX) (Green blinking) Data receiving on primary channel
LED (STX) (Amber blinking) Data transmitting through secondary channel
LED (SRX) (Green blinking) Data receiving on secondary channel
LED (M/S) ON (Green)- The Card is programmed for Master.
OFF (Blank) - The Card is programmed for Slave.
LED (P/S) ON (Green)- The Card is using primary channel for
communication.
OFF (Blank) - The Card is using secondary channel for
communication
Figure 40 : RS485 OFC Bi-Directional Converter Card Front display
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4.16 Power Supply (PPSA) Card (For Type A Power Supply)
Nameplate: PPSA1 and PPSA-2
Functions
1. PPSA card provides an output +4.5V with a capacity of
delivering up to 8Amps of current.
2. The output voltage is used to operate Input and Output cards in
Panel Processor Module.
3. The input of the card is provided with under voltage, over
voltage and reverse polarity protections.
4. The output of the card is provided with under voltage, over
voltage and over load protections.
Table 23 :PPSA Indications
Indication/Interface Description
LED (24 V) (Amber) Availability of power to the
card
LED (ERROR) (Red if not
blank)
Power supply Input out of
limits
LED (4.5V) (Green) 4.5V Output voltage OK
4.17 Power Supply (CCPSB) Card (For Type B Power Supply)
Nameplate: CCPSB-A, CCPSB-B, CVPSB-A, CVPSB-B, OPSB-A, OPSB-B, PPSB-A and
PPSB-B
Functions
1. PSB card provides an output +4.5V with a capacity of delivering up to
3Amps of current.
2. The output voltage is used to operate CIU cards, IOCOM cards and PP
cards.
3. The input of the card is provided with under voltage, over voltage and
reverse polarity protections.
4. The output of the card is provided with over voltage and over load
protections.
Table 24 : CCPSB Indications
Indication/Interface Description
LED (24 V) (Amber) Availability of power to the card
LED (ERROR)
(Red if not blank)
Power supply Input out of limits
LED (4.5V) (Green) 4.5V Output voltage OK
Figure 41 : PPSA Card front display
Figure 42 : CCPSB Card Front display
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4.18 Power Supply (OPSC) Card (For Type C Power Supply)
Nameplate: OPSC1 and OPSC2
Functions
1. PSC card provides an output voltage of +4.5V @ 6A and +5.8
@ 2A which are isolated form earth.
2. The output voltage is used for the operation of the CPU and
Relay driver cards in the OC Module.
3. The input of the card is provided with under voltage, over
voltage and Reverse polarity protections.
4. The output of the card is provided with over voltage and short
circuit protections.
Table 25 :OPSC Indications
Indication/Interface Description
LED (POWER)
(Amber)
Availability of power to the card
LED (ERROR)
(Red if not blank)
Power supply Input out of limits
LED (5.8V) (Green)
5.8V Output voltage OK
LED (4.5V) (Green)
4.5V Output voltage OK
Figure 43 : OPSC Card Front display
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5. Power Supply Arrangements
Each of the modules of MEI633 namely, Central Interlocking Unit, Object Controller and the
Panel Processor, are provided with two independent sources of power. One of them is used to
power the Section-A PCBs and the other is used to power the Section-B PCBs of the
modules.For the PCBs that are common to both Section-A and Section-B, the two powers are
ORed with Diodes and fed to them.
5.1 Power Supply Module (PS)
MEI633 uses three types of Power Supply modules viz, Type A, Type B and Type C Power
supplies. These power supplies are designed specifically to meet the requirements of various
cards in the CIU, OC and PP modules. All the three types take +24V as input. Power supply
Type A (M633PSA-01) is used to power the Input and Output cards of the PP module and is
rated at 4.5V@8A. Type B Power supplies (M633PSB-01) are used to provide power to the
VIC, COMP, PP CPU and IOCOM cards and are rated at 4.5V@3A. Type C Power supplies
(M633PSC-01) are dual output type and are used to provide power to the Input and Output
WFM CPU cards and are rated at 4.5V@6A, 56.8V@2A.
5.2 Power supply connection details
The external power cables are terminated on to WAGO connectors mounted on the rear side
of the modules. Then they are distributed among different PCBs using WAGO connectors
with inbuilt fuse. Before the power is fed to any PCB, it is filtered using an EMI filter to
suppress the effects of EMI, noise and surges on the power input.
5.3 Power cables to be used in MEI633 Installation as per RDSO STS/ E/ TAN/
3012 dt. 28-08-15
Table 26 : Power Cable particulars Sr.
No.
Wire Cable used Wire Guage Wire Colour Code
1 Power from Main IPS 16 sq. mm Red & Black
2 230 V AC 10 sq. mm Red & Black
3 Relay rack power 110 V
AC & 110 V DC
10 sq. mm Red & Black
4 IPS to DB Equipment 4.0 sq. mm Red & Black
5 For looping inside IPS
(use Finolex cable)
4.0 sq. mm Red & Black
6 For relay rack looping 1.5 sq. mm Red & Black
7 I/O Wiring (From OC to
Relay and RR to CT Rack
/FTOT
0.5 sq. mm Red & Black (Coil) (Relay Drive)
O/P Read (Yellow& Brown)
Input Read (Orange & Blue)
8 If station master room is in
other building
UG Cable to be
used along with
Redundant Path
9 Earthing equipment 10 sq. mm Yellow/Green, Green
10 IPS, CT RACK TO BRC 16 sq. mm Black or Yellow/Green
11 Earthing & LA 35 sq. mm Black or Yellow/Green
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5.4 MEI633 fuse rating particulars
Table 27 : Fuse ratings for Equipments Sr.
No.
Equipment Provided for Fuse ratings Remarks
1 CIU Channel –A Channel
– B
4 Amps
2 Object Controller Channel –A Channel
– B
4 Amps
VCOR 4 Amps
3 Panel Processor Channel –A Channel
– B
4 Amps
4 SM Panel
Indication Power
CCIP IND Power 6 Amps at PP
10 Amps at PP @ more than 10
O/P Cards
5 SM Panel Buttons, Knobs,
System Indications
4 Amps at SM
Panel
6 FMC (Fan
Monitoring Card)
CIU, OC & PP 2 Amps
7 Counter & Buzzers Panel for Counters &
Buzzers
250 mA
Table 28 : Fuse ratings for Distribution Box Sr.
No.
DB/Room Provided for Fuse ratings Remarks
1 SER DB SSI-A, SSI-B, SSI -
INT, SSI-EXT
20 Amps Knife
Edge Fuses
@ 0 to 5 No of
OC’s
PSR Room Distribution Box 10 Amps Knife
Edge Fuses
2 DB SSI-A, SSI-B, SSI -
INT, SSI-EXT
32 Amps Knife
Edge Fuses
@ 6 to 11 No of
OC’s
PSR Room Distribution Box 16 Amps Knife
Edge Fuses
3 SER DB SSI-A, SSI-B, SSI -
INT, SSI-EXT
63 Amps Knife
Edge Fuses
Above 12 No of
OC’s
4 PSR Room Distribution Box 32 Amps Knife
Edge Fuses
Note : Before providing the final rating of rated fuses once check the Current with Clamp meter and
provide the Fuse.
The following figures provide information about the power supply connection details for each
module:
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Figure 44 : Power Supply connection details for Central Interlocking Unit Module
Figure 45 : Power Supply connection details for Object Controller Module
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Figure 46 : Power Supply connection details for Object Controller Module
Figure 47 : Power Supply connection details for Panel Processor Module
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Figure 48 : MEI633 Power Distribution for 110 V DC Supply
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Figure 49 : MEI633 Power Distribution for 230 V AC Supply
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Figure 50 : Medha MEI633 EI Power Supply Scheme as per RDSO Technical Advisory Note no. 3012 Ver 2.0 dt. 22.08.2016
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Figure 51: General Block diagram of Power Supply distribution of Medha MEI633 Electronic Interlocking System
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6. MEI633 System Start Up procedure
After configuring and installing MEI 633, the next step in the start up process is to apply
power to the system, and then verify that the internal functions of the MEI 633 system are
working properly.
6.1 Initial Checks before Start Up
(i) The glass doors of each rack should be in locked position.
(ii) The connectors of the cable connecting different modules are fixed properly.
(iii) No loose wires are hanging from any of the PCBs.
(iv) All the indications on the facias of all the PCBs are in OFF condition.
(v) No PCB is projecting outside.
(vi) On the CCIP, the Panel/PC key should be in “Panel” position and if the particular yard
is provided with VDU also, the key can be in any position.
(vii) No indication on CCIP should be ON.
(viii) For Station with Dual VDU, ensure changeover box SM key should be IN, the Knob
position should be in Position 1 or Position 2.
(ix) No Indication on the changeover box should be ON .
(x) Ensure following before switching on the system:
All the earthing connections are made properly and connected to the equipment .
(B+C) SPD provided at the main entry level at 110VDC Distribution Box.
D Type SPD provided at 24 V DC Distribution Box.
63 Amp Fuse Available at entry level of 110 V DC.
Appropriate rated Fuse provided at 110 V DC Distribution box as per load .
4 Amp fuses available at system side.
6 Amp fuses available at Internal supply (VCOR).
2 amp fuses available at Relay rack side.
Appropriate 250 Milli Amp fuse is available at counter and buzzers.
110 V DC is isolated from other AC supply
DL have its own battery supply and wiring have a separated path .
USB ports are disabled (sealing of USB port )
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6.2 System Power On
The following Switch-ON sequence should be followed for starting MEI 633:
A. Centralized System
110 V DC Mains Switch ON (in the IPS room) for powering the central cabin modules.
B. Distributed System
110 V DC Mains Switch ON (in the IPS room) for powering the End Cabin A. (Distributed
system).
110 V DC Mains Switch ON (in the IPS room) for powering the End Cabin B. (Distributed
system).
Procedure for power ON is given below in tabular form.
If Fuse is provided If Isolator 63 Amps is provided
Insert SSI relay INT Fuse Switch ON SSI-INT
Insert SSI CH A Fuse wait1 min then Switch ON SSI-CHA
Insert SSI CH B Fuse Switch ON SSI-CH B
Indications on Start Up
(a) CIU The Power ON LEDs on all the modules of CIU will be ON followed by display of Name of
the Yard on both the FPDs.
The VIC A, VIC B, COMP A and COMP B cards will be ON in sequence.
(b) OC
After power on, VHM, OCI, OCO and RS485-OFC Bidirectional converter cards will be ON.
After checking health of IOCOM cards, VCOR picks up.
When VCOR picks up, all the available ORD cards will become ON.
(c) PP/ CCIP Either of PANEL or PC LEDs will be ON depending upon PANEL/PC key position.
After the communication with COMP CPU is established, the indications on the CCIP will
reflect the actual field conditions – Signals, Points, Track Circuits etc.
(d) Dual VDU
Changeover Box LED will be ON, based on the position of the knob.
PC monitor (VDU-1 and VDU-2 )will display the yard status.
(e) Counter box
Indication is provided to the Operator for the following Critical faults on the Counter Box
Front Facia:
(i) Wrong Side failure Detection by the System
Red LED accompanied with a Fault Alarm.
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CIU SHDN (CIU Shutdown) – If the Wrong side failure is detected by CIU.
OC SHDN (OC Shutdown) – If the Wrong Side failure is detected by OC.
Fault Alarm and Indication persists till the Fault is acknowledged by WSF ACK Button.
(ii) Change in the CVC Status
Indications for CVC (CVC-A and CVC-B) Status:
ACT (Active) – Green LED
STBY (Standby) – Yellow LED
NA (Not Available) – Red LED
Any change in the CVC status is indicated by an Alarm to the Operator.
The Fault Alarm persists till the Fault is acknowledged by CO ACK Button.
(iii) Panel Blank
CCIP is blank and no Route / Signal indication is shown, then
Either Panel Power Supply is faulty.
Or Communication from CIU is faulty from both the channels.
If all the indications on the CCIP are OFF, the Panel Power supply is faulty.
If the Link Status Faulty indication is displayed for both the channels, it indicates that
both the communication channels are faulty.
(iv) Link Status Indication
When Channel A or Channel B link is available, corresponding yellow indication will be
flashing continuously.
When Channel A or Channel B link is faulty, corresponding red indication will be
flashing continuously.
When both the communication channels are faulty, Link Status Faulty indication is
displayed for both channels.
Buzzer and Acknowledgement When Channel A link or Channel B Link fails, a Buzzer is turned on to alert the operator.
The Buzzer is stopped by pressing the Acknowledge button. The Maintenance staff is
informed take appropriate action to rectify the fault.
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Figure 52 : Counter Box Indications
(v) Health Status Indication
When Channel A or Channel B health is good, corresponding yellow indication will be
flashing continuously.
When Channel A or Channel B health is faulty, corresponding red indication will be
flashing continuously.
Buzzer and Acknowledgement
When Channel A Health or Channel B Health is failed, a buzzer is turned on to alert the
operator. To acknowledge the fault, press the Acknowledge button. The buzzer stops
when the fault is acknowledged by operator.
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7. Manual System Changeover
Ensure there is no train movement in the yard.
Ensure that no signal operation is being done by the SM
To do the changeover from Normal system to Standby system – Press “VIC SD button”
on the fascia of the CVHM card of Active channel as indicated in Figure 53.
Use Change over (COR) tool to press the VIC SD button. (do not use excessive force to
press the button).
Then press the COM SD button on the fascia of CVHM card using the COR tool as
indicated in the figure. (do not use excessive force to press the button).
After above operation, Active system will shut down and Stand by system will become
Active.
To restore power of CVC & CCC cards, VIC ON & COM ON buttons should be pressed
respectively.
After Power ON wait until Standby LED of CVC card is ON or standby message is
displayed on MT screen.
Note:
Until Stand by Indication is available on CVC card, No other change over is permitted.
If Active card is shutdown during this period, the complete system will shut down
immediately.
Press VIC SD Button
Press VIC ON Button
Press COM SD Button
Press COM ON Button
Figure 53 : Manual changeover through CVHM Card
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8. Maintenance
Maintenance personnel must be familiar with the recommended methods for operating,
testing, and repairing the MEI633 system equipment.
Periodically check the Battery for the electrolyte level & top up if necessary.
Check the SPD devices for any signs of physical degradation.
Ensure Maintenance Terminal data is backed up during maintenance schedules.
Ensure that MT PC/ VDU is always ON and communication link is working for both A
& B channels. Also ensure that time is in Sync. with Data Logger time.
Adequate quantities of spare cards should be kept in the station to handle any situation
that calls for replacement of the cards. The spare cards to be periodically checked and
verified for correct functional.
Earthing for the installation should be checked once in every six months and regular
maintenance activities should be carried out.
Table 29 : Monthly Maintenance Schedule Sr.
No.
Location Description Action Taken/
Note the Voltage
levels
Observations Remarks
1 MT PC Backup the MT data logs Both channels
Event and Fault
logs data
downloading
should be done
Ensure the MT PC is
always ON and
communication link is
working for both A & B
channels; Also ensure
time is in Sync. With DL
time
2 DL PC Ensure DL is always ON
and Data is backed up
3 IPS Room Check the Voltage levels
at 230V IPS Mains Input
voltage to FRBC modules
150V to 275V If Medha
full IPS is
provided 4 Battery
Room
Measuring Cell, Battery
voltage & specific
Gravity
level maintenance as per
Railways Battery
checklist
Battery bank
fully charged
condition should
be 110V & SG
level 1190 to
1220
If Medha
full IPS is
provided.
Switch off
Mains and
take the
readings
5 Equipment / Clean the Dust filters, To be free from
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Sr.
No.
Location Description Action Taken/
Note the Voltage
levels
Observations Remarks
Relay Room Exhaust fan filters as well
as fans
dust
Clean the EI Equipments To be free from
dust
Check the ommunication
status of the EI Modules
and Ring Modems
Relevant
Communication
and LEDs should
Glow/Blink
Check all Health Status
LEDs,i.e System health
Indication, Output
Voltage Indication of
system and VCOR power
LED indication
LEDs should
Glow/Blink
Check the voltages at
Equipment End of Ch-A
& Ch-B
23V to 24.5V to
be observed
Check the voltages at
Equipment End of
INTERNAL
22V to 24V to be
observed
Check the voltages at
Equipment End of
EXTERNAL (FMC)
22V to 24V to be
observed
Check the Panel
Indication Power voltages
at Equipment End
19V to 21V to be
observed
Visually examine all the
S/A cards are locked &
Inserted properly, tighten
the corresponding screws
Ensure the
tightness of the
cards
Check the all wago fuse
indications
Disconnect type
fuse indications
should not glow
6 Earthing,
LA & SPD
Clean surface of the Earth
Electrode /MEEB /SEEB
/BRC
Surface should be
kept clean
Measure the Earth
Resistance of the
each Earth Pit &Ring
Earth Resistance. Fill
water in the Earth Pits to
keep low soil resistance
Should be <1Ώ
(Ohm)
Check the SPD devices
for any signs of physical
degradation
Check the
Indication LED
status of SPD
Check Lightning Arrestor
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Sr.
No.
Location Description Action Taken/
Note the Voltage
levels
Observations Remarks
connection at copper wire
to Ring earth. Tighten all
the connections
/Terminations
8. Troubleshooting
Troubleshooting of MEI633 system can be done in following ways:
8.1 Troubleshooting with help PCB front panel indications
The front facia of all the MEI633 system printed circuit boards are provided with LED
indications. These indications assist the operator to know the status of the card at any point of
time. These indications may help the maintainer in troubleshooting upto some extent. The
details of these indications are provided in section.
8.2 MEI633 Maintenance tools program
Maintenance engineers and application engineers use MEI633 Maintenance Terminal (MT)
to view and monitor Events/Relay status and MEI633 system faults. MT provide wide range
of options:
Viewing the current status (On line data) of the MEI633 system.
Reviewing stored system event and error data (Off line data).
Cautions when any fault occurs in the system so as to take necessary action.
Shows faults and critical faults in both Channel-A and Channel-B
8.3 Troubleshooting through Maintenance Terminal
CIU logs the generated events and fault codes in external flash memory in every cycle. It
transmits event log to Data logger, fault information to FPD, and both event, fault
information to MT.
GIU based MT is developed as a user-friendly application providing hassle-free interface,
thus making the life easy for the Maintainer to pinpoint the problems during troubleshooting.
MT is a password-protected application, where unauthorized access is not allowed.
The Event log/Fault analysis can be performed over a required time frame, chosen by the
maintenance staff. Print facility is also available.
The Playback feature of MT provides the Operator/Maintainer to visualize the Yard status
over a required time frame and thus making the analysis easier.
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Fault messages are in simple English and greatly help to pinpoint the error location within the
shortest time frame.
Example:
A) If the communication messages from IOCOM0 to COMP are corrupted – Fault code
displayed on MT is “Channel Noisy – IOCOM0”
B) If the communication messages from IOCOM0 to COMP are not available – Fault code
displayed on MT is “Link Fail – IOCOM0”
C) If the position of the Point18 in the field is undetermined - Fault code displayed on MT is
“Point Detection Failed – PT18”
D) If HR Relay of Signal1 is picked up unintentionally, a wrong side failure is indicated
along with safety action – Fault code displayed on MT is “HR Wrong Side Fail – SIG1”
8.4 Troubleshooting through MEI633 Fault Codes
Troubleshooting the MEI633 system involves careful analysis of observable fault codes
displayed on Maintenance Terminal tool program and front panel display, and the ability to
perform standard electrical and electronic troubleshooting operations.
System event log information associated with different modules of MEI633 are captured in
Maintenance terminal tool program contain great deal of historical information regarding the
performance of MEI633. These event logs are useful while troubleshooting. The information
placed in the event logs contain Fault Codes, which are categorized into Critical and Non
Critical Faults.
The Critical Faults are the Faults, which may cause Restart or Shutdown of the Faulty
module, or they indicate a serious error, which needs immediate attention.
The Maintainer is alerted about the Critical Fault by a Fault Buzzer in the Front Panel
Display and also in the Maintenance Terminal, if it is connected to the System.
Non Critical Faults are the faults, which do not cause the System to restart, or shutdown, but
the System may continue to operate through the other redundant channel or in a de-graded
mode of operation.
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8.5 Trouble shooting serial communication link problems
Serial link to MT
When no event logs are displayed on the MT then check the serial cable connecting MT to
CVC card of MEI633. Insert the cable properly on either end of the cable. If cable ends are
properly inserted even logs will be displayed in MT. Even after inserting the cable properly if
event logs are not displayed then replace the cable.
Serial link to Front panel display
When Link Failed message is displayed on front panel, check for serial cable connecting
ISO232 card. If the cable is found faulty replace the cable. When status is not displayed
check for power supply LED on the front panel display. If power supply LED doesn’t glow
then check power supply connection cable and take necessary action.
Serial link to VDU
When Yard is not displayed on VDU PC check for serial cable connecting RS232-OFC card.
If the cable is found faulty replace the cable.
After the cause of the malfunction has been isolated to either the serial communication link
problem or a single line replaceable hardware item, the next step is to make corrective repairs
and restore the system to normal operation.
If the malfunction has been traced to a hardware component, replace the card and make the
necessary repairs as per fault code tables.
If the malfunction appears to be related to the application program, review the program
listing carefully, make any necessary corrections, recompile the program, and then reload the
program as per Service manual System manual covering the application programming of the
MEI633 system. After the application software has been reloaded, check the configuration of
the affected portion of the system as per MEI System configuration guidelines. Then retest
the affected system functions to verify proper operation.
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Figure 54 : Flowchart for Medha MEI633 EI Input Relay Failure Troubleshooting
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Figure 55 : Flowchart for Medha MEI633 EI Output Relay Failure Troubleshooting
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9. Do's & Don'ts
Do's
Keep the EI Room free from dust.
Maintain minimum 25V-27V at Distribution Box in EI IPS Room.
Check the EI system fuses at regular intervals for proper contact.
Check the SPD health indication i.e. whether indication glowing or not in EI-Relay room
and EI-IPS Room periodically.
Ensure Maintenance Terminal PC is always ON and verify the Event Data Log updates.
Periodically change over to STANDBY system by shutting down the ACTIVE system
quarterly as per prescribed changeover procedure.
Periodically check the tightness for the earth connections at MEEB, SEEB and all pin
earth points.
Clean externally accumulated dust in EI equipment with soft with soft cloth/brush.
Periodically check the battery for the electrolyte level and makeup if necessary.
In case of testing is required, it shall be done by trained personnel when the yard is free
from movement or occupancy.
Don't
Try to troubleshoot without MEI633 training.
Use Walkie Talkie, Mobile phone or any radio equipment near EI equipment.
Switch off any of the EI-IPS Modules when EI is in operation.
Remove Modules, Fuses, or Connectors when EI is in operation.
Forcibly pick up any Relay/Relays in EI room/Field
Remove any EI Relay/Relays.
Change Jumper settings/Application Data without prior approval.
Disturb OFC cable or connector.
Switch OFF MT-PC/Loading any software/Files.
Use Removable media/USB/DVD/CD in VDU and MT PCs.
Try to do system changeover without following System Changeover procedure
Perform changeover before standby LED indication is available on CVC card or before
standby message is displayed on MT screen.
Touch the board components / Repair on your own.
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Quality Policy
“We at RDSO Lucknow are committed to maintain and update
transparent standards of services to develop safe, modern and cost
effective railway technology complying with statutory and regulatory
requirements, through excellence in research, designs and standards by
setting quality objectives, commitment to satisfy applicable requirements
and continual improvements of the quality management system to cater
to growing needs, demand and expectations of passenger and freight
traffic on the railways through periodic review of quality management
systems to achieve continual improvement and customer appreciation. It
is communicated and applied within the organization and making it
available to all the relevant interested parties.”
INDIAN RAILWAYS Centre for Advanced Maintenance Technology Maharajpur, Gwalior (M.P.) Pin Code – 474 005
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