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411 views383 pages

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MEP

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HANUMA REDDY

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Troubleshooting Manual

MICROPROCESSOR BASED
LOCOMOTIVE CONTROL SYSTEM

TYPE MEP
FOR INDIAN RAILWAYS

Version 2 and 2A Version 3 Version 4

IM - 203 rev 0 MEDHA SERVO DRIVES PVT. LTD.

Information in this document is subject to change without notice.

This document contains confidential, proprietary information of Medha

Servo Drives Pvt. Ltd. Unauthorized copying, reproduction, or disclo-
sure of any portion of the contents of these materials by any means in-
cluding printed or duplicated materials, onscreen publication, or Web
documentation is expressly forbidden.

Medha logo is registered trademark of Medha Servo Drives Pvt. Ltd.

Any other trademarks are the property of their respective owners.

Document No: IM - 203 rev 0

Released: November, 2016.
Table of Contents
Chapter 1
Introduction 7
Chapter 2
Classification and Reset Procedure of Fault Messages 9
Chapter 3
High Priority Faults 11
Chapter 4
Medium Priority Faults 167
Chapter 5
Low Priority Faults 225
Chapter 6
Only Error Log Messages 371
TH
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Points to be noted while working with WDP1
locomotive

Please note that various faults and their troubleshooting procedures discussed
in this manual may vary based on the type of locomotive.

The major differences in WDP1 locomotive compared to other locomotives :

● Four driving axles are present instead of six, so only four Traction motors are available.
Hence, parameters related to TM5 and TM6 are not applicable to WDP1 locomotives.
● Power circuit consists of only parallel power contactors and no series contactors are
available. So, the locomotive operates only in Parallel (4P) mode.
● Power circuit consists of Field shunting contactors. So parallel mode with weak field is also
available.
● As no series power contactors are available, locomotive never operates in series mode,
and series mode with weak field.
● Dynamic braking grids are not available. Hence, Dynamic braking operation, BKT
contactors, and self load test feature are not available.
● User is requested to observe that few of the parameters may vary for WDP1 locomotive.
For example, in WDP1 locomotive, Traction Alternator current is displayed as TAAI,
whereas in other locomotives, it is TA_A.

HENCE, USER IS SUGGESTED TO REFER THE MANUAL ACCORDING TO

THE DESCRIPTION GIVEN ABOVE.
TH
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Chapter 1

INTRODUCTION

The Microprocessor based locomotive control system MEP continuously

monitors operating levels of various parameters like current, voltage,
temperature, pressure, RPM etc. and status of all auxiliary and main contacts
of contactors. MEP identifies any abnormal working conditions of equipment
that indicates a fault in that equipment. Various faults that are identified are
given in the fault manual document issued by Medha Servo Drives. On
identification of any such fault, an appropriate control action is taken instantly
to avoid damage to traction equipment. A fault message, along with any
restriction applied due to the fault is displayed on the display unit for guiding
loco pilot. The fault is recorded in the error log along with date and time stamp
along with data packs of various locomotive parameters. These data packs
help the maintenance staff finding root cause of the fault and also helps to
analyze complicated faults.

MEP troubleshooting manual provides information like restrictions imposed

by the fault, probable causes that can cause the fault and the remedial
actions to isolate the fault. The isolation procedures are written for each and
every fault message identified and listed in the below fault message manual.
No troubleshooting guide is required for the fault recovery messages, that are
listed in the fault message manual.

MEP Manual explains step by step procedure to isolate the fault both in
locomotive as well as in MEP components. It is recommended that user
should read the system manual document and schematics of MEP document
IM 198.

In the step by step procedure of fault isolation, user has been asked to
perform Manual testing of inputs and outputs through display unit wherever
necessary. Find the status of digital inputs/ outputs and functioning of output
devices. The procedure for manual testing of inputs and outputs is described
in the system manual document IM 198.

The digital input cards are provided with green and yellow LEDs on the front
fascia of the card to know the status of the digital inputs. Various digital inputs
and digital outputs with their connections between locomotive and the control
unit having their corresponding cable IDs, This data is extracted from the
Electrical schematics for MEP system.

Various menu, submenu, and the displayed parameters in each group are
given for quick reference to navigate through display menu.
Chapter 1 - Introduction Medha Servo Drives Pvt Ltd.

Precautions to be followed while troubleshooting:

TE
NO
● Whenever it is asked to move the locomotive or open the first notch with GF
ON, extreme care should be taken that brakes are applied physically on the
wheels and brake system is working normally as per Rail Road instructions.
● Whenever user is asked to replace the card or cable, first switch OFF all
breakers, replace the card or cable and switch ON the breakers and then
continue the test. Removal of card or cable with supply ON may damage the
respective card or module.
● Use proper tools like spanners or nut drivers, etc., to remove or replace
defective components. Do not try with mismatched tools.
● While reconnecting wires or cables, ensure proper cable tags are available
and they are connected correctly to the correct terminals. If cable tags are
missing, disconnect cables or wires and check for continuity, re-tag the
wires and connect. Wrong connection of any wire/cable may lead to further
complicated trouble.

8 IM-203 rev 0
Chapter 2

CLASSIFICATION AND RESET

PROCEDURE OF FAULT MESSAGES

Faults are classified into three levels such as high, medium and low priority,
based on the severity of the effect of the fault on locomotive operation.

2.1 High Priority Faults

Faults that cause damage to engine, total restriction of loco operation or
damage to electrical equipment are classified as high priority faults. The order
of priority of these faults is assigned based on the restrictions imposed on the
locomotive operations due to occurrence of the fault. Faults, which lead to
engine shut down or prohibition of motoring and dynamic braking etc. are
treated as first in priority faults. The faults leading to reducing power of
locomotive are second in priority. The faults resulting in cutting out of traction
motor are next in priority. In case of these faults, the Alarm Gong (ALG) and
the display buzzer will be energized either continuously or for 30 seconds.
Loco pilot can silence the Alarm Gong and buzzer by pressing the
acknowledge switch provided on the display unit. In most of the faults, the
alarm gong and buzzer goes OFF after 30 seconds automatically.

2.2 Medium Priority Faults

Faults resulting in reduction of power, prohibition of dynamic braking,
prohibition of battery charging etc. are treated as medium priority faults. In
these faults, alarm gong energizes for 5 seconds and the display of fault
message and buzzer continues for 15 seconds.

2.3 Low Priority Faults

Faults, for which fault tolerance is built in the system and other faults are
treated as low priority faults. In these cases, Alarm Gong will not be energized
but the fault message gets displayed and the buzzer in the display unit gets
energized for 15 seconds.

In case of any fault, the fault is recorded in the error log along with 8 data
packs irrespective of its priority level. It is recommended to download this
error log to and analyze the fault data pack before going for actual
investigation.

2.4 Fault reset

For most of the faults, automatic recognition of fault recovery is provided.
When a fault occurs, MEP system identifies the fault recovery conditions and
announces recovery for the fault through a display message and
automatically removes all restrictions imposed on the loco operation due to
Chapter 2 - Classification and Reset Procedure of Fault Messages Medha Servo Drives Pvt Ltd.

that fault. For few faults, method of automatic reset of fault when the master
controller handle is brought to idle is used. In this case, fault gets reset three
times automatically within an hour and if the fault repeats for 4th time, it can
not get reset. It can only be reset manually. Only for very few faults, fault
clearing is restricted to manual resetting.

For any fault, it is possible to clear the fault manually through the display unit,
after attending to it. However, three levels of access are defined for this
purpose.

2.4.1 Access level low

Access level low faults (irrespective of their priority level) are permitted to be
cleared by loco pilot. By pressing ‘MENU’ key, user can select ‘Faults’ menu
and from the sub options, he/ she can select ‘Clear Active Faults’ menu and
navigate through the faults active at that point of time, which are displayed
one by one based on their priority. User can clear any fault by pressing ‘0/F4’
key, when that fault gets displayed. If it is an access level-LOW fault, the
system clears the fault immediately and informs the same on the display unit,
by removing any restrictions in loco operation imposed by that fault.

2.4.2 Access Level Medium

Access level medium faults are meant for clearing only by maintenance staff
of the locomotive shed. Clearing of these faults require higher level
knowledge about the locomotive. Clearing of these faults can be done only
by entering a pass code, which the system requests to enter, when ‘0/F4’ key
is pressed against respective fault in ‘Clear Active Faults’ menu.

2.4.3 Access Level High

Access level high is only for very few faults where, in depth knowledge of
locomotive equipment as well as knowledge of MEP system is necessary.
These faults can be cleared only through a LAPTOP PC connected to the
MEP system and cannot be cleared through display unit.

10 IM-203 rev 0
Chapter 3

HIGH PRIORITY FAULTS

PARAMETER DESCRIPTION
FAULT CODE 1001
FAULT MESSAGE Low Water Level.
RESTRICTIONS Engine Shutdown
ALARM BELL Continuous ON
LOW, MANUAL.
RESET LEVEL After manual reset if the fault still present, the fault will be generated
again.
FAULT RECOVERY. Automatic when fault is cleared and 20 seconds time is lapsed.
LWS operated due to low water level.
PROBABLE CAUSES Fault may be due to micro switch, float of the LWS unit, Water pump
faulty etc.
Any open circuit in LWS wiring from LWS to MEP system.
1. Check whether the water pump is working or not. If not, replace
water pump.
2. Check Water level, If water is less add water to reset the fault.
3. If water is full, check operation of LWS by operating LWS cock.
a. Check voltage at wire No. 51 wrt to 4 on back side of LWS switch.
If voltage is more than 63 V, fault is either LWS wiring or LWS
faulty
● Check wiring continuity of wire No. TO1 from LWS to
backside TB. Observe for any disconnected wires. If
disconnected wires are observed, reconnect/ replace the
new wire.
● Check for any disconnected wires at LWS. Reconnect the
corresponding wires.
b. If voltage at wire No. TO1 is zero,
FAULT ISOLATION 1. Check for any disconnected wires at LWS. If wire continuity
is good, LWS micro switch is defective. Replace and check.
2. Check voltage at wire No. 51 at backside TB. Observe for
any disconnected wires at the terminal. If disconnected
wires are observed, reconnect them.
c. If the voltage at back side of TB on wire No. TO1 is greater than
65V,
1. Check the wiring continuity of wire No. TO1 from backside
TB to MEP control unit connector by removing the coupler
with wire marker TO1. If no continuity, replace the cable.
4. Check the Green and yellow LEDs on digital input card TO1. input
indicates the status of LWS feedback signal. If only Green LED is
glowing on corresponding digital input card and yellow LED is not
glowing, it indicates that the LWS feedback input is available upto
digital input card and the DIP card is defective. Replace the card.
DISPLAY TO DRIVER Yes

Ver 2 Ver 2A Ver 3 Ver 4

Applicable for
YES YES YES YES
Chapter 3 - High Priority Faults Medha Servo Drives Pvt Ltd.

PARAMETER DESCRIPTION
FAULT CODE 1002
FAULT MESSAGE Engine over speed.
RESTRICTIONS Engine shutdown
ALARM BELL 30 seconds
LOW, MANUAL.
RESET LEVEL After manual reset if the fault is still present, the fault is generated
again
Automatic when engine is not running and Master Handle is kept in
FAULT RECOVERY
IDLE position for a duration of 10 seconds.
1. Faulty wiring from tacho generator to MEP
PROBABLE CAUSES
2. Faulty Tacho generator/ Engine Speed sensor
3. Faulty governor or sticky racks
1. Reset the fault. Ensure that there are no sticky racks or fuel
injection pumps. If OSTA is tripped, reset it. Crank the engine.
2. Check the notch wise engine RPM.
A. If the RPM is not correct,
a. Check up with the governor and set the notch wise engine
RPMs within the limits.
B. If the displayed RPM is correct,
a) Check up with tacho generator wiring from tacho generator
FAULT ISOLATION
terminal board to backside TB to MEP for any open circuit
or loose connections.
b) Check up tacho generator frequency (engine RPM) with
conventional RPM meter as used in conventional WDM3A
locomotives.
c) If notch wise readings are not stable and heavy fluctuation
is noticed, check for tacho generator/ Engine Speed sensor
and replace.
DISPLAY TO DRIVER Yes

TE
NO Tacho signal is taken in MEP V0 and V1 fitted locomotives only.

Ver 2 Ver 2A Ver 3 Ver 4

Applicable for
YES YES YES YES

12 IM-203 rev 0
Medha Servo Drives Pvt Ltd. MEP Troubleshooting Manual

PARAMETER DESCRIPTION
FAULT CODE 1003
FAULT MESSAGE Exciter Drive short circuit fault.
RESTRICTIONS Motoring and Dynamic Braking prohibited
ALARM BELL 30 seconds
Medium, Manual
RESET LEVEL After manual reset if the fault is still present, then fault is generated
again.
FAULT RECOVERY. No auto recovery.
1. Defective wiring.
PROBABLE CAUSES
2. PWM output card is defective.
3. The current sensor is giving faulty output.
1. Switch OFF all breakers.
2. Switch on MB1, MB2, MFPB1, MFPB2, FPB and MPCB breakers.
3. Change the display mode to 'Excitation' under 'Display' option
available in menu.
4. Operate the EXPR relay manually and check the Exciter field
current EXFI.
5. If EXFI is indicating current,
a. There could be an external short between Exciter terminal LS
and locomotive 4 wire. Identify and remove the short circuit.
FAULT ISOLATION b. There could be a wrong connection in the FCP. Check the FCP
connections and rectify.
c. PWM card might be defective. Replace the card and check up.
6. If EXFI is indicating zero amps, crank the engine. Apply loco
brakes. Ensure the brakes are physically applied. Switch on both
GF switches and open notch 1. Check the EPWM and EXFI values.
7. If EXFI is rising proportionally to the EPWM value, then the system
is working normal.
8. If EXFI is indicating high current, the current sensor is defective.
Replace the current sensor and check up.
DISPLAY TO DRIVER Yes

Ver 2 Ver 2A Ver 3 Ver 4

Applicable for
YES YES YES YES

IM-203 rev 0 13
Chapter 3 - High Priority Faults Medha Servo Drives Pvt Ltd.

PARAMETER DESCRIPTION
FAULT MESSAGE 1004
RESTRICTIONS LLOB Trip at Engine Off, Reset Plunger
ALARM BELL Cranking prohibited
RESET LEVEL Continuous ON
Medium, Manual
FAULT RECOVERY. After manual reset if the fault is still present, the fault is generated
again.
PROBABLE CAUSES Automatic when the fault is cleared and 20 seconds of time has
lapsed.
1. Low Lube Oil button might be tripped in the Woodward governor.
FAULT ISOLATION
2. The feedback input wire of OPS is getting wrong supply.
1. Check the Low Lube Oil button position on the Woodward governor.
2. If tripped (projecting outside),
a. Press the button inside to reset.
b. Reset the fault manually and crank the engine.
3. If LLOB is not in tripped position
A. Pull the knob outside and reset once again.
B. Check the OPS (LLOB) feedback signal at Digital input card.
a. With LLOB in normal position, both LED's are OFF (Green
& Yellow) in Digital input card.
b. With LLOB in tripped position, both LED's (Green & Yellow)
are ON in Digital input card.
C. If both LED's are ON (Green & Yellow) in Digital input card
with LLOB in normal position,
DISPLAY TO DRIVER
a. Check the voltage at wire No. 1B at the backside TB.
b. If the voltage is greater than 65 V,
c. Disconnect the wires 1B and identify which wire is getting
supply.
d. If the wire is from governor amphonal plug, then the micro
switch in the Governor is shorted. Replace the micro switch.
e. If the wire is from loco side, there may be a wrong feedback
from indication panel side. Check up and isolate the supply.

Note: Most probably, this fault is accompanied with a Fault message

"LLOB Trip at Engine Run, Reset Plunger" (Fault code 1005). Loco
pilot might have reset the fault on the display without resetting the
LLOB on the Governor.
DISPLAY TO DRIVER Yes

Ver 2 Ver 2A Ver 3 Ver 4

Applicable for
YES YES YES YES

14 IM-203 rev 0
Medha Servo Drives Pvt Ltd. MEP Troubleshooting Manual

PARAMETER DESCRIPTION
FAULT MESSAGE 1005
RESTRICTIONS LLOB Trip at Engine Run, Reset Plunger
ALARM BELL Cranking prohibited.
RESET LEVEL Continuous ON
Medium, Manual
FAULT RECOVERY. After manual reset if the fault is still present, the fault is generated
again.
PROBABLE CAUSES Automatic when the fault is cleared and 20 seconds of time has
lapsed.
1. Low Lube Oil Button might have tripped in the Woodward
FAULT ISOLATION governor.
2. The feedback input wire of OPS is getting wrong supply.
1. Check the Low Lube Oil Button position on the Woodward governor.
2. If tripped (Knob projecting outside),
A. Press the button inside to reset.
B. Reset the fault manually and crank the engine.
3. If LLOB is not in tripped position,
A. Pull the knob outside and reset once again.
B. Check the OPS (LLOB) feedback signal at Digital input card.
a. With LLOB in normal position, both LED's are OFF (Green &
Yellow) in Digital input card.
b. With LLOB in tripped position, both LED's (Green & Yellow)
are ON in Digital input card.
C. If both LED's are ON(Green & Yellow) in Digital input card with
LLOB in normal position,
a. Check the voltage at wire No. 1B at the backside TB.
DISPLAY TO DRIVER
b. If the voltage is greater than 65 V,
c. Disconnect the wires 1B and identify which wire is getting supply.
d. If the wire is from governor amphonal plug, then the micro switch
in the Governor is shorted. Replace the micro switch.
e. If the wire is from loco side, there may be a wrong feedback
from indication panel side. Check up and isolate the supply.

Applicable for
YES YES YES YES

IM-203 rev 0 25
Chapter 3 - High Priority Faults Medha Servo Drives Pvt Ltd.

PARAMETER DESCRIPTION
FAULT CODE 1016
FAULT MESSAGE Alternator Field Circuit Open FAULT
RESTRICTIONS Nil
ALARM BELL 30 seconds
Low, Manual
RESET LEVEL After manual reset if the fault is still present, the fault is generated
again.
FAULT RECOVERY. Automatic when Traction Alternator Field circuit is closed.
1) Internal fault with Exciter.
2) Defective wiring of cables from Exciter Generator to Tr. Alternator
field.
PROBABLE CAUSES
3) Poor contact of GF contactor main tips/ the main tips may not be
closing due to mechanical obstruction in the contactor assembly.
4) Bad contact between Traction Alternator brushes and slip rings.
5) Tr. Alternator field showing high resistance/ open circuited.
1) Set the Display mode to 'Excitation' through Display menu.
2) Apply locomotive brakes. Keep Reverser Handle in neutral position.
Switch on both the GF switches and open notch to 1.
3) Observe Exciter Field current (EXFI) and Exciter PWM output
(EPWM). Exciter Field current should rise proportional to the Exciter
PWM output.
4) Measure Exciter output voltage on Exciter terminals (LA and LAA).
(a) If the Exciter output voltage is not proportional to notch then
i. Exciter is defective. Replace the Exciter.
(b) If Exciter Voltage is proportional to notch, then check the
voltage on terminals (61L and 44) at the backside TB.
(c) If the voltage is zero, then
i. The exciter output cables 61L/ 44 are having high resistance
or open circuited. Identify and replace the cable.
(d) If the voltage is equal to Exciter Voltage, then check the voltage
on terminals 44 at backside TB and 61L at GF contactor.
(e) If the voltage is zero, then
FAULT ISOLATION i. The cable 61L from backside TB to GF contactor is having
high resistance or open circuited. Check and replace the
cable.
(f) If the voltage is equal to the Exciter Voltage, then check the
voltage on the terminals 44 at backside TB and 61K at GF
contactor. (Ensure that the GF contactor is in picked up
condition and AFR connections are removed.)
(g) With GF contactor closed and the voltage is zero, then
i. GF contactor main tips are not closing properly. Remove the
archute and examine for any mechanical obstruction/ foreign
materials inside the contactor. Remove archute and clean
the contactor. If the contactor itself is defective, replace the
contactor.
(h) If the voltage is equal to Exciter Voltage, then check the
Voltage on terminals 61K and 44 at backside TB.
(i) If the voltage is zero, then
i. The cable 61K from GF contactor to backside TB is having
high resistance or open circuited. Check and replace the
cable.

26 IM-203 rev 0
Medha Servo Drives Pvt Ltd. MEP Troubleshooting Manual

PARAMETER DESCRIPTION
(j) If the voltage is equal to the Exciter Voltage, then check the
voltage on the Traction Alternator brush arms. Extreme care
should be taken while measuring the voltage at the Traction
Alternator slip rings. It is highly recommended to shut down
the engine and connect measuring leads at the brush arms.
After connecting the leads to meter, set up the locomotive as
per the Sl. No. 1 to 3.
(k) If the voltage is zero, then
i. The cables AF1 and AF2 connecting Traction Alternator
brush arms and back side TB are having high resistance/
open circuit. Check and replace the cables.
(L) If the voltage is equal to Exciter Voltage, then
i. The problem is inside the Traction Alternator. Check the
following and fix up the problem
A) Check up the brush arms and brushes for any open
circuit/burnt symptoms.
FAULT ISOLATION
B) Check up for any discoloration of slip rings that can cause
bad contact between brushes and slip rings.
C) Check up any burnt/fused slip ring connections.
D) Check for any open circuit in the Traction Alternator Field
circuit.
5) If every thing is normal, measure the Traction Alternator Field
current with a clip on DC ammeter clipped to any one of the
Traction Alternator Field cables.
6) If the meter indicates current and the value of EXAI on the display
is less/zero, then
(a) The communication cable between the current sensor EXAI
and MEP is bad. Check the continuity of the cable and if
necessary replace the cable.
(b) If the cable is good, then the sensor is bad. Replace the
sensor.
7) Return the throttle to IDLE, and select the 'End Load Box Test'
option available under 'Load Box Test' option under MENU.
DISPLAY TO DRIVER Yes

Ver 2 Ver 2A Ver 3 Ver 4

Applicable for
YES YES YES YES

IM-203 rev 0 27
Chapter 3 - High Priority Faults Medha Servo Drives Pvt Ltd.

PARAMETER DESCRIPTION
FAULT CODE 1017
FAULT MESSAGE Exciter Field Circuit Open or Short Fault.
RESTRICTIONS Nil
ALARM BELL 30 seconds
Low, Manual
RESET LEVEL After manual reset if the fault still present, the fault is generated
again.
FAULT RECOVERY. Automatic when Exciter Filed Current found normal.
1) Defective FCP.
2) Defective wiring (Open circuited at Ex. Gen. TB or backside TB.)
PROBABLE CAUSES 3) Defective EXPR interlocks (61F-61FF, 61G-61GA)
4) Open circuited exciter field
5) Defective Current Sensor.
6) Defective PWM card.

1) Set the Display mode to 'Excitation' through Display menu.

2) Apply locomotive brakes. Keep Reverser Handle in neutral position.
Switch on both the GF switches and open notch to 1.
3) Observe Exciter Field current (EXFI) and Exciter PWM output
(EPWM). Exciter Field current should rise proportional to the Exciter
PWM output.
4) If exciter field current is zero even though EPWM value is increasing,
(a) Check the voltage between 61F at FCP terminal and locomotive
4.
(b) If the voltage is zero, FCP is defective. Replace FCP and check
up.
5) If voltage at 61F is between 25 to 40 V, check the voltage between
61F at EXPR relay and locomotive 4 wire.
(a) If the voltage is zero, wire 61F is open circuited from FCP to
EXPR. Replace the wiring.
6) If voltage at 61F (EXPR) is between 25 to 40 V, check the voltage
between wire 61FF at EXPR interlock and locomotive 4 wire.
(a) If the voltage is zero, then EXPR interlock is bad. Replace
EXPR relay and check up.
FAULT ISOLATION 7) If voltage at 61FF (EXPR) is between 25 to 40 V, check the voltage
between 61FF at EXFI current sensor and locomotive 4 wire.
(a) If the voltage is zero, 61 FF wire from EXPR relay to EXFI
current sensor is open circuited. Replace the wire and check
up.
8) If voltage at 61FF (EXFI) is between 25 to 40 V, check the voltage
between wire LSS at EXFI and locomotive 4 wire.
(a) If the voltage is zero, EXFI current sensor is defective. Replace
the current sensor and check up.
9) If voltage at LSS (EXFI) is between 25 to 40 V, check the voltage
between wire LSS at Exciter field terminal and locomotive 4 wire.
(a) If voltage is zero, wire LSS is open circuited from EXFI to
Exciter field.
10 ) If voltage at LSS (Exciter field) is between 25 to 40 V,
(a) Exciter field might have open circuited. Check and replace
exciter if necessary.
(b) Wire LS/61GA connecting from Exciter field and TB might have
open circuited. Check and replace.
(c) Wire 61GA TB to EXPR interlock might have open circuited/
bad contact. Replace EXPR and check up.

28 IM-203 rev 0
Medha Servo Drives Pvt Ltd. MEP Troubleshooting Manual

d) Wire 61G from EXPR interlock to TB might have open circuited.

Check and replace if open circuited.
(e) Connector of PWM cable slack at MEP. Check and tighten the
connector.
FAULT ISOLATION (f) Wire 61G from TB to MEP might have open circuited. Check the
continuity of 61G wire from TB to PWM cable If necessary
replace the cable.
(g) If still EXFI current is zero with EPWM value, the PWM card is
defective. Replace the card and check up.
Display to Driver Yes

Ver 2 Ver 2A Ver 3 Ver 4

Applicable for
YES YES YES YES

36 IM-203 rev 0
Medha Servo Drives Pvt Ltd. MEP Troubleshooting Manual

5) Set up the display mode to 'Manual Tests for outputs' under

Test Mode menu
6) Select BKTMCL and press 1 /F2 (ON) to operate magnet valve
of BKT motoring side.
7) If the BKT is not operated to motoring side, then
(a) Check the voltage at the operating coil of BKT motoring side
magnet valve.
(b) If the voltage is greater than 65 V, then the operating coil is
open circuited internally. Replace magnet valve.
(c) If the voltage is zero, check the voltage between (wire
terminal 6 on the BKT motoring magnet valve) and
locomotive 4 wire.
(d) If the voltage is zero, (6) wire loop coming to BKT motoring
FAULT ISOLATION side magnet valve is open circuited. Check and replace.
(e) If voltage is greater than 65 V, then positive supply is
available but negative supply through MEP is missing.
i. Check the slack ness of the DOP cable connector at MEP.
If slack tighten the connector.
ii. Check the wire continuity of BKMCL from the BKT
motoring magnet valve coil to DOP cable connector. If
necessary replace the cable and check up.
Iii. If still BKT is not operated to motoring position, digital
output card is defective. Replace the card and check up.
8) If BKT is operated to motoring side, then select BKTBCL and
press 1 /F2 (ON).
9) BKT should move to Braking side and exit the test mode to turn
the display to normal mode. Reset the fault and release the loco.
DISPLAY TO DRIVER Yes

Ver 2 Ver 2A Ver 3 Ver 4

Applicable for
YES YES YES YES

IM-203 rev 0 37
Chapter 3 - High Priority Faults Medha Servo Drives Pvt Ltd.

PARAMETER DESCRIPTION
FAULT CODE 1024
BKT-M Aux Contact circuit Open. Run Auto/ Manual Test.
FAULT MESSAGE
Electrical Control problem.
RESTRICTIONS Motoring prohibited
ALARM BELL 30 seconds
Low, Manual
RESET LEVEL After manual reset if the fault is still present, the fault is generated
again.
FAULT RECOVERY Automatic when BKT-M Aux. Contact circuit closes.
1. Wiring faulty causing low status level of BKT-M feedback.
2. BKT Interlock.
PROBABLE CAUSES
3. Motoring coil supply from MEP system to Magnet valve may be
the problem.
4. Positive supply to Motoring coil from TB may be the problem.
Green LED's on the digital input card indicate the status of BKT
position in the following pattern.
BKT-M status on BKT-B status on
BKT position
Digital input card Digital input card
BKT in Motoring Position ON OFF
BKT in Dynamic Braking
OFF ON
Position

1. Check BKT Aux. contacts for any dislocation of contacts /

disconnected wires. If any found, rectify or replace the
Aux.Contacts, if necessary. Ensure proper closing of Aux.
Contacts both in motoring and dynamic braking position.
Reset the message.
2. Ensure that the control air pressure is 5 kg/cm2 . Set the display
mode to “Manual Tests for outputs” under Test Mode menu and
select BKTMCL out put and press 1 /F2 (ON) to operate magnet
valve of BKT motoring side
3. BKT is operated to motoring side. Ensure that Aux. Contacts are
operated and closing properly. Check input status on the Digital
Input card
4. If Green LED is not ON on the digital output card , then
A. Check the supply between wire terminal 51 at the
common terminal of the Auxiliary contacts of BKT and
wire 4.
a. If the voltage is zero, then +Ve wire 51 loop is
open circuited. Check and replace.
b. If the voltage is greater than 65 V, then check the
voltage between Aux. Contact BKTM and 4.
c. If the voltage is zero, then the Aux. Contact is bad.
Check and clean. If necessary replace.
d. If the voltage is greater than 65 V, then check the
voltage between wire terminals BKTM and 4 at the
backside TB.
e. If the voltage is zero, then the wire BKTB between
Aux. Contact and backside TB is open circuited.
Check and replace.
f. If the voltage is more than 65 V, then the wire
BKTMFB between backside TB and MEP is open
circuited. Check and replace.
5. Exit the test mode to turn the display to normal mode. Reset the
fault and release the loco.
DISPLAY TO DRIVER Yes

38 IM-203 rev 0
Medha Servo Drives Pvt Ltd. MEP Troubleshooting Manual

Ver 2 Ver 2A Ver 3 Ver 4

Applicable for
YES YES YES YES

PARAMETER DESCRIPTION
FAULT CODE 1025

FAULT MESSAGE Alternator O/P Voltage High FAULT

RESTRICTIONS Motoring and Dynamic Brake prohibited

ALARM BELL 30 seconds
Medium, Manual
RESET LEVEL After manual reset if the fault is still present, the fault is generated
again.
Automatic when Traction Alternator Voltage is reduced below 100 V
FAULT RECOVERY. and Master Handle is brought to IDLE. Auto recovery is permitted
for three times in an hour. There after Manual reset is required.

1) Momentarily the Traction Alternator Voltage might have shoot up

PROBABLE CAUSES
2) Some wiring short circuit has occurred in FCP or Exciter field
circuit.

1) Connect a DC voltmeter 0 to 1000 V range between GA11 and

GA2.
2) Crank the engine and ensure loco brakes are applied.
3) Enter 'Load Box Test' under Test mode menu.
4) Move the master Handle to Notch 1 with both GF switches are
ON.
5) Observe the Traction Alternator Voltage displayed on the display
unit under TA Volts.
6) Compare this reading with the voltage reading on the external
voltmeter.
7) If the voltage on the display is abnormally higher than the voltmeter
reading, then
a) The voltage sensor is faulty. Check up the cable connections
FAULT ISOLATION on the Tr. Alternator Voltage sensor TAV. If necessary replace.
8) If both the voltages are same and are abnormally high as compared
to 1 st notch no load voltage, then move the Master Handle to
IDLE.
a) Check wiring connections at FCP (EFR1, 2, 3 and 4). Check
for any disconnected/short-circuited/over heated wire terminals
at the FCP. Check and rectify.
b) Check wiring connections at wire terminals f EXPR (61G and
61GA) on the backside TB for any disconnected or short-
circuited or over heated terminals. Check and rectify.
c) Check the exciter terminal board for any short circuit or
grounded wires of the exciter field.
9) If both the voltages are equal and within limits, then the fault is a
transient.
DISPLAY TO DRIVER Yes

Ver 2 Ver 2A Ver 3 Ver 4

Applicable for
YES YES YES YES

IM-203 rev 0 39
Chapter 3 - High Priority Faults Medha Servo Drives Pvt Ltd.

PARAMETER DESCRIPTION
FAULT CODE 1026
FAULT MESSAGE Alternator Output Current High FAULT
RESTRICTIONS Motoring and Dynamic Braking prohibited
ALARM BELL 30 seconds
Medium, Manual
RESET LEVEL After manual reset if the fault is still present, the fault is generated
again.
Automatic when Traction Alternator current is reduced below 100 A
and Master Handle is brought to IDLE. Auto fault recovery is
FAULT RECOVERY.
permitted for three times in an hour. There after Manual reset is
required.
1. Defective FCP
PROBABLE CAUSES 2. Any foreign materials in between REV or BKT contacts causing
high current to flow
3. Defective current sensor
1. Check for any disconnected/ over heated wires at the FCP. Identify
and reconnect the wires.
2. Check BKT and REV contacts. Remove any foreign materials if
available.
3. Apply loco brakes and ensure that the brakes are physically
applied. Take all precautions required to move a locomotive.
4. Set up the locomotive to motoring and move the master handle to
notch 1.
FAULT ISOLATION
5. If the current indicated on the display is within limits of 1st notch
current, then the fault is transient.
6. If the current indicated on the display is abnormally high without
any jerk, then the current sensor is faulty. Check and replace the
Traction alternator current sensor.
7. If the current indicated is abnormally high with heavy jerk, PWM
output card is defect.
8. Replace the card and check once again.
DISPLAY TO DRIVER Yes

Ver 2 Ver 2A Ver 3 Ver 4

Applicable for
YES YES YES YES

40 IM-203 rev 0
Medha Servo Drives Pvt Ltd. MEP Troubleshooting Manual

PARAMETER DESCRIPTION
FAULT CODE 1027
FAULT MESSAGE Alternator Field Over Current fault.
RESTRICTIONS Motoring and Dynamic Braking prohibited
ALARM BELL Continuous
Medium, Manual
RESET LEVEL After manual reset if the fault is still present, the fault is generated
again.
Automatic when Traction Alternator field current is reduced below 20A
FAULT RECOVERY. and Master Handle is brought to IDLE. Auto fault recovery is permitted
for three times in an hour. There after Manual reset is required.
1. Defective FCP
PROBABLE CAUSES
2. Defective Exciter
3. Exciter field drive circuit defect
1. Check for any disconnected/ over heated wires at FCP. Identify and
reconnect the wires.
2. Check for any short circuit between armature and field circuit either
internally or externally, like terminals touching to insulation cover,
etc. If found, rectify and remove short circuit.
3. Apply loco brakes and ensure that the brakes are physically applied.
FAULT ISOLATION Take all the precautions required to move a locomotive.
4. Set the display mode to excitation mode.
5. Set up the locomotive to motoring and move the master handle to
notch 1.
6. Observe the exciter field current and exciter armature current on
the display unit. If both the values are within the limits, then the fault
is transient.
DISPLAY TO DRIVER Yes

Ver 2 Ver 2A Ver 3 Ver 4

Applicable for
YES YES YES YES

IM-203 rev 0 41
Chapter 3 - High Priority Faults Medha Servo Drives Pvt Ltd.

PARAMETER DESCRIPTION
FAULT CODE 1028
FAULT MESSAGE Exciter Field over current fault.
RESTRICTIONS Motoring and Dynamic Braking prohibited
ALARM BELL 30 seconds
Medium, Manual
RESET LEVEL After manual reset if the fault is still present, the fault is generated
again.
Automatic when exciter field current is reduced below 0.5A and
FAULT RECOVERY. Master Handle is brought to IDLE. Auto fault recovery is permitted
for three times in an hour. Thereafter Manual reset is required.
1. Defective or wrong connection at FCP.
2. Defective Exciter (Field internally shorted).
3. Any one-diode short circuit in the rectifier making the system to
PROBABLE CAUSES
pump more current in the exciter field.
4. One of the alternator phase is not generating any voltage.
5. Defective EXFI current sensor.
6. Defective Analogue input card.
1. Check for any disconnected or over heated wires at the FCP.
Identify and reconnect the wires correctly.
2. Check for any short circuit between Exciter terminals either
internally or externally, like terminals touching to insulation cover.
If found, rectify and remove short circuit.
3. Check backside terminal board for any disconnected exciter field
wires and touching to nearby positive wires. Identify and isolate
FAULT ISOLATION them.
4. Check and ensure that there are no short-circuited diodes in the
rectifier.
5. Measure the Exciter field current with an ammeter and compare
with the displayed EXFI value.
6. If the displayed EXFI value is greater than the actual current, then
A. EXFI current sensor might be defective, replace and check.
B. Analogue input card might be defective, replace and check.
DISPLAY TO DRIVER Yes

Ver 2 Ver 2A Ver 3 Ver 4

Applicable for
YES YES YES YES

42 IM-203 rev 0
Medha Servo Drives Pvt Ltd. MEP Troubleshooting Manual

PARAMETER DESCRIPTION
FAULT CODE 1029
FAULT MESSAGE Cranking contactor CK stuck closed.
RESTRICTIONS Motoring and Dynamic Brake may prohibit.
ALARM BELL Continuous
Low, Manual
RESET LEVEL After manual reset if the fault is still present, the fault is generated
again.
Automatic on releasing of stuck condition as sensed through
FAULT RECOVERY.
Auxiliary contacts of CK1/ CK2/CK3.
1. CK1/CK2/CK3 contactor main tips are welded.
PROBABLE CAUSES 2. Defective wiring. (Wiring from these auxiliary interlocks
disconnected)
3. Defective digital input card
1. Check the status of CK1/CK2/CK3 feedback LED's on the
respective digital input card (Green)
2. Whichever LED is not glowing, corresponding cranking contactor
is welded or interlock is bad.
3. Check for any weld condition of the contactors. Release the main
tips with a wooden stick.
4. If there is no welding of contactors, check and clean the concerned
N/C interlocks of that particular contactor.
5. If interlock is proper, check the voltage between CK#FB and
locomotive 4 wire.
6. If the voltage is more than 65 V,
A. Check the slackness of the DIP cable connector at control unit.
FAULT ISOLATION
If slack, press the connector towards the control unit and tighten
the connector.
B. If connector is tight and still the green LED is not glowing,
a. There is no continuity of CK#FB wire to corresponding
connector. Remove the connector and check the continuity.
If necessary, replace the cable.
b. If continuity is ok and still green LED is not glowing, Digital
input card might be defective, replace and check.

Note : MEP Ver 3.06 or above versions CK1 & CK3 or CK2 & CK3
both cotactctors are ON, then only Motoring and Dynamic
Brake is prohibitted.
DISPLAY TO DRIVER Yes

Ver 2 Ver 2A Ver 3 Ver 4

Applicable for
YES YES YES YES

IM-203 rev 0 43
Chapter 3 - High Priority Faults Medha Servo Drives Pvt Ltd.

PARAMETER DESCRIPTION
FAULT CODE 1030
FAULT MESSAGE SLBR / SLBC Contactor stuck closed.
RESTRICTIONS Motoring prohibited and Dynamic Braking prohibited
ALARM BELL 30 seconds
RESET LEVEL Low, Manual
Automatic when stuck condition is released as sensed through
auxiliary contacts of SLBC1, SLBC2 and SLBC3. Manual fault clearing
FAULT RECOVERY.
through keyboard on the display unit. (If the fault condition is present
when cleared manually, the fault is generated again).
1. Defective SLBR relay. (Permanently ON)
2. Welded SLBC1/ SLBC2/ SLBC3
PROBABLE CAUSES
3. Defective wiring. (SLBC FB wire is getting +ve supply)
4. Defective Digital output card
1. Check the status of SLBR relay.
2. If SLBR is in drop out condition, check the status of SLBC contactors.
3. If any SLBC contactor is in pick up position, check the supply at the
magnet valve coil.
A. If the voltage is more than 65 V, then SLBR relay is defective or
SLBC wire is getting supply.
B. Replace the SLBR relay or identify the wrong supply to SLBC
contactor.
4. If no SLBC contactors are in pick up condition, check for the welded
interlocks of SLBC auxiliary contacts. If found, replace the Aux.
FAULT ISOLATION Contacts.
5. If no Aux. Contacts of SLBC is welded, check the supply between
SLBC FB wire and wire 4 of locomotive.
A. If the voltage is more than 65 V, then SLBC FB wire is getting
wrong supply. Identify wrong wiring and rectify.
6. If SLBR is in pick up condition,
A. Check the supply voltage at SLBR coil. If the voltage is more
than 65 V, then Digital output card is defective. Replace the
card.
B. If the voltage is zero, then the relay is defective. Replace the
relay.
DISPLAY TO DRIVER Yes

Ver 2 Ver 2A Ver 3 Ver 4

Applicable for
YES YES YES YES

44 IM-203 rev 0
Medha Servo Drives Pvt Ltd. MEP Troubleshooting Manual

PARAMETER DESCRIPTION
FAULT CODE 1031
FAULT MESSAGE Wheel Number 1 continuously sliding
RESTRICTIONS No restrictions. Warning only.
ALARM BELL As long as loco moves and for 30 seconds minimum.
Low, Manual
RESET LEVEL After manual reset if the fault is still present, the fault is generated
again.
Automatic on arresting of wheel slide as sensed through TM speed
FAULT RECOVERY.
sensor.
PROBABLE CAUSES 1. Brake binding on No.1 wheel, resulting in low speed.
2. Defective Speed sensor on TM 1
1. If any Brake binding is found, clear it as early as possible.
2. Check for tightness of the speed sensor coupler of TM No.1 and
FAULT ISOLATION ensure that the coupler is tight.
3. Speed sensor gear in the TM No.1 is slack or freely rotating in the
end cup. If found, replace TM.
DISPLAY TO DRIVER Yes

Applicable for
YES YES YES YES

76 IM-203 rev 0
Medha Servo Drives Pvt Ltd. MEP Troubleshooting Manual

PARAMETER DESCRIPTION
FAULT CODE 1064
FAULT MESSAGE Low Lube Oil Pressure
RESTRICTIONS Engine Shutdown.
ALARM BELL 30 sec.
Medium, Manual
RESET LEVEL After manual reset if the fault still present, the fault will be generated
again.
Automatic when engine is shutdown. Automatic Fault Reset is
FAULT RECOVERY. permitted for maximum 5 times in an hour, after which manual clearing
is required.
1. This message will be logged if engine is shutdown due to low lube
oil pressure as sensed by LOP pressure sensor available in MEP
system.
PROBABLE CAUSES
2. Lube Oil Pressure is really dipped below the set limit.
3. Pressure sensor might be defective.
4. Analog input card might be defective.
1. Check the real conditions at which the engine is shut down. If
really there is a dip in LOP, identify the root cause for LOP dipping.
2. Check the difference of pressures between LOP gauge/ MEP
display reading, if there is a difference between the display/ LOP
gauge
3. Connect a calibrated gauge at the pressure inlet of LOP sensor
FAULT ISOLATION by providing a ‘T’ joint. Crank the engine. Compare the readings.
4. If there is a difference between display and the calibrated gauge:
A. Replace the sensor and verify the readings.
B. If still the difference of reading is available, change the Analog
input card and check the readings.
C. If the difference is permissible, check any leakages in the
pipelines and clean the pipes.
DISPLAY TO DRIVER Yes

TE
This message is logged only when the ‘Low LOP Shut down enabled’ flag is
NO
set to ON. By default, this flag is disabled as Governor is taking care of low
lube oil pressure.

Ver 2 Ver 2A Ver 3 Ver 4

Applicable for
YES YES YES YES

IM-203 rev 0 77
Chapter 3 - High Priority Faults Medha Servo Drives Pvt Ltd.

Applicable for
NO No YES YES

80 IM-203 rev 0
Medha Servo Drives Pvt Ltd. MEP Troubleshooting Manual

PARAMETER DESCRIPTION
FAULT CODE 1068
FAULT MESSAGE REV Stuck in Reverse. Run Auto/ Manual Test
RESTRICTIONS Forward Motoring and Forward Dynamic Brake Prohibited
ALARM BELL 30 seconds
Low, Manual
RESET LEVEL After manual reset if the fault still present, the fault will be generated
again.
Automatic when RVFFB and RVRFB feedback signals become
FAULT RECOVERY.
normal.
1. Control air pressure is < 3.5 Kg/cm2.
2. REV is physically got stuck due to mechanical obstruction.
PROBABLE CAUSES 3. Defective wiring of REV feedback signals RVFFB and RVRFB.
4. REV forward direction magnet valve defective.
5. REV forward direction magnet valve is not getting electrical supply.
6. Defective digital output card.
1. Check and adjust the control air pressure to 5 Kg/cm2.
2. Manually operate the Reverser by pressing the forward and
reverse magnet valves alternatively to ensure free operation of
the contacts.
A. Ensure that change over contacts and auxiliary contacts are
changing their position freely.
B. If the operation of the REV is sluggish/ not operating, attend/
replace the reverser.
C. Check the feedback LED's status on the corresponding digital
input card. Both green and yellow LEDs should toggle their
status with respect to REV operation.
D. If the status is not synchronizing to REV operation,
a. Adjust the feedback auxiliary contacts to get correct logic.
b. If both Green LEDs are not glowing corresponding Digital
input card, check the incoming supply at the common
terminal of the Aux. Contacts. (wire No. 51) with respect to
locomotive 4 wire.
c. If the supply is zero, check the continuity of +Ve supply/ 51
wire loop. If necessary, change the wiring.
FAULT ISOLATION d. If supply is more than 65V, check the supply at outgoing
terminals (wire nos. RVFFB and RVRFB).
e. If supply is more than 65 V on the corresponding terminal
with respective to REV position,
1. Check the slackness of the digital output connector of
cable, If slack tighten the connector.
2. Check the wire continuity of wires from REV feedback
auxiliary contacts to MEP. If necessary, replace the cable.
3. Manually set the REV in Reverse direction.
4. Set the display mode to ‘Manual Test for outputs’ under Test Mode
menu and select 'REVFCL' and press ‘Enter’ key to test reverser
forward.
5. Press 1/ F2 to energise the REV forward side magnet valve.
6. The REV should operate to forward direction. The Green LED on
the corresponding digital input card should glow.
7. If REV is not operating to forward direction, Check supply at the
REV forward side magnet valve coil.
A. If supply is more than 65 volts, then magnet valve is defective.
Replace the magnet valve.
B. If supply is zero, check the supply at the magnet valve coil
terminal (wire no. 8) with respect to locomotive 4 wire.

IM-203 rev 0 81
Chapter 3 - High Priority Faults Medha Servo Drives Pvt Ltd.

PARAMETER DESCRIPTION
a. If the voltage is zero, check continuity of 8-wire loop coming
to magnet valve.
b. If voltage is more than 65V, Check the voltage between
locomotive wire 13/51 and wire RVFCL at the magnet valve
coil
1. If the voltage is zero,
FAULT ISOLATION 2. Check the slackness of the digital output connector of the
cable at MEP. If slack, tighten the connector.
3. Check the continuity of wire RVFCL from the magnet valve
coil to the connector of cable. If necessary, replace the cable.
4. Replace the digital output card and check up once again.
8. Press 0 /F3 to de-energise the magnet valve and press menu key
to exit.
DISPLAY TO DRIVER Yes

Ver 2 Ver 2A Ver 3 Ver 4

Applicable for
YES YES YES YES

82 IM-203 rev 0
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PARAMETER DESCRIPTION
FAULT CODE 1069

FAULT MESSAGE REV-F Aux. Contact ckt. Open. Run Auto/ manual Test.

RESTRICTIONS Forward Motoring and Forward Dynamic Brake Prohibited

ALARM BELL 30 seconds
Low, Manual
RESET LEVEL After manual reset if the fault still present, the fault will be generated
again.
FAULT RECOVERY. Automatic when the REV-F Auxiliary contact circuit is closed.

1. Bad contact of REV-F auxiliary contact.

PROBABLE CAUSES
2. Disconnected wires at auxiliary contacts/ open circuited.

Ensure Reverser is in forward direction. If not operate manually.

1. Check the status of REV-F feedback on the corresponding digital
input card.
2. If the digital input LED is not glowing:
A. Auxiliary contact is bad. Clean/adjust the contact and check.
B. Check supply voltage at incoming terminal (wire No. 51) with
respect to locomotive 4 wire.
a. If supply is zero, check the continuity of +Ve/ 51-wire loop.
FAULT ISOLATION
b. If the supply voltage is more than 65V, check supply
between wire no. REV-F Feedback and locomotive 4 wire.
1) If the supply voltage is more than 65V,
i. Check the slackness of the digital out put connector
of the cable at MEP. If slack tighten the connector.
ii. Check the continuity of the REV-F Feedback, from the
reverser aux. Contact to digital out put connector of
cable. If necessary replace the cable.
DISPLAY TO DRIVER Yes

Ver 2 Ver 2A Ver 3 Ver 4

Applicable for
YES YES YES YES

IM-203 rev 0 83
Chapter 3 - High Priority Faults Medha Servo Drives Pvt Ltd.

PARAMETER DESCRIPTION
FAULT CODE 1070
FAULT MESSAGE REV Stuck in Forward. Run Auto/Manual Test
RESTRICTIONS Reverse Motoring and Reverse Dynamic Brake Prohibited
ALARM BELL 30 seconds
Low, Manual
RESET LEVEL After manual reset if the fault still present, the fault will be generated
again.
Automatic when the RVFFB and RVRFB feed back signals become
FAULT RECOVERY.
normal.
1. Control air pressure is < 3.5Kg/ cm2.
2. REV is physically got stuck due to mechanical obstruction.
PROBABLE CAUSES 3. Defective wiring of REV feedback signals RVFFB and RVRFB
4. REV reverse direction magnet valve defective.
5. REV reverse direction magnet valve is not getting electrical supply.
6. Defective digital output card
1. Check and adjust the control air pressure to 5 Kg/ cm2.
2. Manually operate the Reverser by pressing the forward and
reverse magnet valves alternatively to ensure free operation of
the contacts.
A. Ensure that change over contacts and auxiliary contacts are
changing their position freely.
B. If the operation of the REV is sluggish/ not operating, attend/
replace the reverser.
C. Check the feed back LED's status on the digital input card ,
Both Green and Yellow LED's should toggle their status with
respect to REV operation.
3. If the status is not synchronizing to REV operation:
A. Adjust the feedback auxiliary contacts to get correct logic.
4. If both Green LED's are not glowing on digital input card , check
the voltage between +Ve wire/ 51 at the Aux. Contact of reverser
and locomotive 4 wire.
A. If the supply is zero, check the continuity of +Ve/ 51wire loop.
If necessary change the wiring.
B. If supply is more than 65V, check the supply at out going
terminals (wire nos. RVFFB and RVRFB by changing the REV
FAULT ISOLATION position).
a) If supply is more than 65V on the corresponding terminal
with respective REV position, check the wire continuity of
wires from REV feed back auxiliary contacts to MEP. If
necessary replace the cable.
5. Manually set the REV in Forward direction.
6. Set the display mode to ‘Manual Test for outputs’ under Test Mode
menu and select 'RVRCL' and press ‘Enter’ key to test reverser
reverse.
7. Press 1/ F2 to energise the REV forward side magnet valve.
8. The REV should operate to reverse direction.
9. If REV is not operating to reverse direction, check supply at the
REV reverse side magnet valve coil.
A. If supply is more than 60 volts, then magnet valve is defective.
Replace the magnet valve.
B. If supply is zero, check the supply at the magnet valve coil
terminal (wire no. 0) with respect to locomotive 4 wire.
a. If the voltage is zero, check continuity of 0 wire loop
connected to magnet valve.
b. If voltage is more than 65V, check the voltage between
locomotive wire No. 13/51 (TB) and wire RVRCL at
magnet valve coil.

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PARAMETER DESCRIPTION
1. If the voltage is zero,
i. Check the slackness of the digital out put connector of the
cable. If slack tighten the connector.
ii. Check the wire continuity of RVRCL from the magnet valve
to digital output connector of cable.If necessary replace the
FAULT ISOLATION
cable.
iii. The digital output card might be defective. Change the card
and check up once again.
10. Press 0 /F3 to de-energise the magnet valve and press menu
key to exit.
DISPLAY TO DRIVER Yes

Ver 2 Ver 2A Ver 3 Ver 4

Applicable for
YES YES YES YES

PARAMETER DESCRIPTION
FAULT CODE 1071
FAULT MESSAGE REV-R Aux. Contact ckt. Open. Run Auto/manual Test.
RESTRICTIONS Reverse Motoring and Reverse Dynamic Brake Prohibited
ALARM BELL 30 seconds
Low, Manual
RESET LEVEL After manual reset if the fault still present, the fault will be generated
again.
FAULT RECOVERY. Automatic when the REV-R Auxiliary contact circuit is closed.
1. Bad contact of REV-R auxiliary contact.
PROBABLE CAUSES
2. Disconnected wires at auxiliary contacts/ open circuited wiring.
1. Ensure Reverser is in reverse direction. If not operate manually.
2. Check the digital input status on the corresponding digital input
card.
3. If the input LED is not glowing on the digital input card:
A. Auxiliary contact is bad. Clean/ adjust the contact and check.
B Check supply voltage at incoming terminal (wire No. 51/13)
with respect to locomotive 4 wire.
a. If supply is zero, check the continuity of +Ve/51-wire loop.
FAULT ISOLATION
b. If the supply voltage is more than 65V, check supply
between wire no. RVRFB and locomotive 4 wire.
1) If the supply voltage is more than 65V,
i. Check the slackness of the digital output connector of
the cable at MEP. If slack, tighten the connector.
ii. Check the digital output continuity of the wire RVRFB,
from the reverser aux. contact to connector of cable.
If necessary, replace the cable.
DISPLAY TO DRIVER Yes

Ver 2 Ver 2A Ver 3 Ver 4

Applicable for
YES YES YES YES

IM-203 rev 0 85
Chapter 3 - High Priority Faults Medha Servo Drives Pvt Ltd.

PARAMETER DESCRIPTION
FAULT CODE 1072
FAULT MESSAGE Wrong Command: TL23 High & TL17 Low. Cannot Brake
RESTRICTIONS Dynamic Brake Prohibited
ALARM BELL 30 seconds
Low, Manual
RESET LEVEL After manual reset if the fault still present, the fault will be generated
again.
FAULT RECOVERY. Automatic when the TL23 and TL17 both are found High.
1. This fault generally logs while the locomotive is set to dynamic
brake mode or while changing from dynamic brake to motoring.
PROBABLE CAUSES
2. Wrong wiring.
3. Jumper cable defective while working in MU consist.
1. Most probably this fault is a transient fault and recovers
automatically when dynamic brake is applied in correct sequence.
2. Set the locomotive to dynamic brake mode. If the fault is not
logging, then the fault is transient.
3. If the fault is logging frequently, check the following.
FAULT ISOLATION 4. Proper sequence of master controller interlocks which are
energizing wire No. 23 and wire no. 17.
5. Wire No. 17 should get energized in OFF position.
6. Wire No. 23 should get energized in Big. B position.
7. Check up whether wire No. 23 is getting any wrong feed due to
wrong connections or defective MU cable.
DISPLAY TO DRIVER Yes

Ver 2 Ver 2A Ver 3 Ver 4

Applicable for
YES YES YES YES

86 IM-203 rev 0
Medha Servo Drives Pvt Ltd. MEP Troubleshooting Manual

PARAMETER DESCRIPTION
FAULT CODE 1073
FAULT MESSAGE Fire Alarm ON in self Loco. Check for fire and extinguish fire.
RESTRICTIONS Engine Shutdown.
ALARM BELL 30 seconds
Medium, Manual
RESET LEVEL
After manual reset if the fault still present, the fault is generated again.
Automatic when engine is shut down and fire alert signal is OFF.
FAULT RECOVERY. Automatic fault recovery is permitted for 3 times in an hour after which
manual clearing is required.
1. MEP detected fire alert signal FAS FB as High from Fire Alert
System and shut down the engine.
PROBABLE CAUSES 2. Defective wiring.
3. Detective MU cable.
4. Digital input card might be defective.
This message can log when fire alerter signal FASFB status is made
HIGH either by fire alerter system or wrong supply to this input.
Ensure that there is no fire accident in lead loco before trouble
shooting the fault.
1. Check the digital input status on the corresponding Digital input
card. If digital input is glowing:
A. Check the voltage between wire FASFB and 4. If voltage is
more than 65V,
a. Then the fire alerter system is ON. Check the Fire alerter
system and reset. If already system is reset, then wire
FAULT ISOLATION
FASFB is getting a wrong supply. Identify and rectify the
problem.
B. If voltage is zero, Fire alerter system is not activated but
message is logged then the Digital input card might be
defective. Check for the concerned digital input channel
defective messages in the fault log.
C. Replace the Digital input card, if needed and verify.

Note: Malfunction/ wrong detection of fire by the fire alerter

system can cause logging of the above fault.
DISPLAY TO DRIVER Yes

Ver 2 Ver 2A Ver 3 Ver 4

Applicable for
YES YES YES YES

IM-203 rev 0 87
Chapter 3 - High Priority Faults Medha Servo Drives Pvt Ltd.

PARAMETER DESCRIPTION
FAULT CODE 1074
FAULT MESSAGE Field Shunting Relay FSR Stuck Closed.
Motoring always with field shunting. Motoring in parallel and DB
RESTRICTIONS
prohibited.
ALARM BELL 30 seconds
Low, Manual
RESET LEVEL After manual reset if the fault still present, the fault will be generated
again.
Automatic when the stuck closed relay/contactor is detected as
FAULT RECOVERY.
open.
1. Defective FSR Relay
PROBABLE CAUSES 2. Defective wiring.
3. Defective output card.
Ensure engine is running and loco speed is zero and MCH is in idle
position.

1. Check the digital input status on the corresponding digital input

card
2. If all the digital inputs are glowing, check the status of FSR relay.
A. If FSR is energized, Check the voltage across FSR relay.
a. If voltage is zero, FSR relay is bad. Change the relay.
b. If voltage is more than 65V, then digital output card is
defective. Replace the card and check.
c. FSRCL wire is getting wrong supply. Check and remove
the short circuit.
FAULT ISOLATION
3. If any of the LED is glowing but FSR is in de-energised position
check the status of FS contactors.
A. If any of the FS contactor is in pick up conditions /welded
replace the contactor.
B. If any one of contactor is picked up then concerned positive
wires FSFB/FS1/ FS2/ FS3 is getting wrong supply. Identify
and rectify. If necessary change the FSR relay. (Its interlocks
shunts might be shorting with positive supply.)
4. If none of the LED's are glowing in digital input card but the fault
is logged, check the FS contactors for any delayed operation in
pick up/ drop out. Delayed dropout of any FS contactor can log
this fault and later on it is recovered.
DISPLAY TO DRIVER Yes

TE This Error message is generated only if either “Series Field Shunting” or

NO “Parallel Field Shunting” ENABLED flags are set (√).

Ver 2 Ver 2A Ver 3 Ver 4

Applicable for
YES YES YES YES

88 IM-203 rev 0
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PARAMETER DESCRIPTION
FAULT CODE 1075
FAULT MESSAGE Field Shunting Relay FSR circuit open.
RESTRICTIONS Field shunting is prohibited.
ALARM BELL 30 seconds
Medium, Manual
RESET LEVEL After manual reset if the fault still present, the fault will be generated
again.
Automatic when the master handle is brought to IDLE. Automatic reset
FAULT RECOVERY.
is permitted for 3 times after which manual reset is required.
Defective FSR relay.
PROBABLE CAUSES Defective digital output card
Defective wiring of FS contactor feed back.
1. Set the display mode to ‘Manual Test for outputs’ under Test Mode
menu.
2. Select ‘FSRCL’ and press ‘Enter’ key to test the FSR operation.
3. Press ‘1’/ F2 key to switch on FSR relay.
4. FSR relay should pickup and along with that, all FS contactors
also should pick up.
5. If FSR relay is not picking up, check voltage across FSR relay coil
with a voltmeter.
A. If voltage is more than 65V, then the Relay is defective. Replace
the relay.
B. If voltage is zero, check voltage at FSR coil terminal (Wire No.
13/51) with respect to locomotive 4 wire with a voltmeter.
a. If voltage is zero, check the continuity of 51/13-wire loop
connected to FSR relay. Check and replace the open
circuited wires.
b. If voltage is more than 65V, check the voltage between
locomotive 13/51 wire and wire FSRCL at FSR relay coil
terminal.
1) If the voltage is zero,
i. Check slackness of digital output connector of cable
at MEP control unit. If slack, tighten the connector.
ii. Check continuity of FSRCL wire from FSR coil
FAULT ISOLATION
terminal to MEP. If necessary, replace the cable.
iii. Digital output card might be defective. Replace the
card and check up.
6. If FSR relay is picking up and FS contactors are not picking up:
A. Bad interlock of FSR relay. Replace the FSR relay.
B. There is no 51/13-wire supply at FSR relay interlocks. Check
up continuity of 51/13-wire loop. Replace any open circuited
wires.
7. If FS contactors are picking up,
A. Check the digital input status on the corresponding digital input
card, The digital inputs should glow.
B. If the digital inputs are not glowing, check voltage at incoming
wire 51 at FS contactor auxiliary contacts with respective to
locomotive 4 wire.
a. If the voltage is zero, check continuity of 51-wire loop.
Replace any open circuited wires/ wrong connections.
b. If voltage is more than 65V, Check the voltage at auxiliary
contact of the corresponding FS contactor with respect to
locomotive 4 wire.
1. If the Voltage is more than 65V, check continuity of wire
FSFB/ FSxx FB from FS contactor Auxiliary contact to
MEP. If necessary, replace the cable.
DISPLAY TO DRIVER Yes

IM-203 rev 0 89
Chapter 3 - High Priority Faults Medha Servo Drives Pvt Ltd.

TE This Error message is generated only if either “Series Field Shunting” or

NO “Parallel Field Shunting” ENABLED flags are set (√).

110 IM-203 rev 0

Medha Servo Drives Pvt Ltd. MEP Troubleshooting Manual

PARAMETER DESCRIPTION

11. If FS26 alone not picking up,

A. The loop wires of either FS1 or 4 might have open circuited.
Check and replace.
B. The operating coil might be defective. Replace the FS
contactor.
FAULT ISOLATION 12. Check the FSR cables connected between REV and FS
contactors for any open circuit. If any replace the open circuited
cables.
13. Check FSR resistors. Replace any open circuited FSRs.
14. Check the FSR cables connected between FSR resistors and
REV. Replace any open circuited cables.

DISPLAY TO DRIVER NO

TE This Error message is generated only if either “Series Field Shunting” or

NO “Parallel Field Shunting” ENABLED flags are set (√).

Ver 2 Ver 2A Ver 3 Ver 4

Applicable for
YES YES NO NO

IM-203 rev 0 111

Chapter 3 - High Priority Faults Medha Servo Drives Pvt Ltd.

PARAMETER DESCRIPTION
FAULT CODE 1097
Traction Alternator out put short circuit fault. Check if S1, S21,S31
FAULT MESSAGE
Contacts welded.
RESTRICTIONS Motoring and dynamic brake prohibited
ALARM BELL 30 seconds
Medium, Manual
RESET LEVEL After manual reset if the fault still present, the fault will be generated
again.
Automatic when master handle is brought to IDLE. Auto fault
FAULT RECOVERY. recovery is permitted for 2 times in an hour. There after manual
reset is required.
The message is logged whenever a short circuit is exhibited across
GA11 and GA2 terminals. The short circuit might be a momentary or
a permanent cause.
1. Fluttering of power contactor due to improper air supply and
causing momentary short circuit across GA11 and GA2.
PROBABLE CAUSES
2. Power contactor stuck in middle position momentary / permanent.
3. Defective wiring in the power circuit.
4. Momentary short across GA11 and GA2 cables due to any foreign
body in BKT/ REV contactors.
5. Burnt / short circuited diodes in power rectifier.
1. Check for any welded power contactors. If any power contactors
are welded, check for the following defects.
A. Control air pressure is less. If so adjust to 5 Kgs./Sq.cm.
B. Check for air leakages in the pneumatic pipeline connected
to power contactor. If necessary replace the pneumatic pipe.
C. Replace the power contactor and ensure proper operation of
the power contactors.
2. If power contactors are not in welded condition, check for any
welded symptoms of PC welding on the tips. If welding symptoms
are found, replace the power contactor.
3. Run Auto / manual test for digital outputs and ensure that there
FAULT ISOLATION are no faults recorded on power contactors during self-test.
4. If any faults are logged, adjust the auxiliary contacts.
5. If Power contactor are in healthy condition, check for burnt / over
heated / flashed contacts on BKT / REV. (Any metallic foreign
materials fallen on BKT can cause momentary short circuit).
6. If any burnt / over heated / flashed contacts in BKT / REV clean
the contacts and ensure proper operation of BKT / REV.
7. Reset the fault and set the loco to Motoring position and open the
1st Notch, if TAAI is equals to sum of all TMcurrents it indicates
the faulty momentary and it is cleared.
8. If no TM currents are sensed check for any short circuit between
GA11 and GA2. Identify the short circuit and rectify.
DISPLAY TO DRIVER Yes

Ver 2 Ver 2A Ver 3 Ver 4

Applicable for
YES YES YES YES

112 IM-203 rev 0

Medha Servo Drives Pvt Ltd. MEP Troubleshooting Manual

PARAMETER DESCRIPTION
FAULT CODE 1102
P2 Stuck Closed without Aux Contact ON. Check if Contact
FAULT MESSAGE
welded.
RESTRICTIONS Series motoring and Dynamic braking prohibited.
ALARM BELL 30 seconds
Medium, Manual
RESET LEVEL After manual reset if the fault still present, the fault will be generated
again.
FAULT RECOVERY Nil
1. Defective P2 contactor.
2. Defective aux. interlock of P2 contactor.
3. Defective wiring.
PROBABLE CAUSES 4. Defective TM1AI current sensor.
5. Due to control air pressure below 2kg/cm2.
6. Defective of digital input card.
This message will log whenever Traction Motor 1 current is sensed
through TM1AI but P2 contactor aux. interlock feed back is not
sensed. Delayed operation of contactor or contactor stuck in mid
position can cause the above fault.
1. Check the status of the P2 power contactor. If the contactor is
stuck in mid position replace the contactor.
2. If the contactor is normal,
A. Check the operation of the power contactor by manually
operating the magnet valve. Ensue that the contactor is
operating freely with out any delay. If the contactor is sluggish
in operation replace the contactor.
B. Run manual test for the power contactor and ensure the
feedback is detected correctly by the system.
3. If the Feed back is not detected by the system in the manual test,
A. Check the digital input status on corresponding digital input
card.
a. If the digital input LED is not glowing while the contactor
pick up, check the voltage between wires P2 FB and 4
wire.
(1) If Voltage is more than 65V, then the digital output
FAULT ISOLATION connector of cable is slack or the wire P2FB is
open circuited. Identify and rectify. If necessary
replace the cable.
(2) If voltage is zero, check the voltage between 51
and 4 at the auxiliary contact of P2.
(i) If voltage is more than 65V, the Aux. Contact
is bad. Replace the aux. Contacts of power
contactor.
(ii) If the voltage is zero, wire loop of 51 wire is
defective. Identify and replace.
4. If every thing is normal, Set the display mode to wheel slip mode.
Create a fault of any parallel contactor stuck closed. Set the loco
to motoring 1st notch with brakes applied.
A. Compare the TM1 current with all other TM currents.
B. If the TM1 current is abnormally high, Sum up all the
TMcurrents and compare with Tr. Alternator current.
a. If the difference is more or less equal to excess current
of TM1 then,
(1) TM1AI sensor might be defective. Replace the
current sensor and check up.

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Chapter 3 - High Priority Faults Medha Servo Drives Pvt Ltd.

PARAMETER DESCRIPTION

(2) Analog input card might be defective. Replace the

card and check up.
b. If both the TAAI and sum up currents are more or less
equal, check the TM1 power circuit and traction motor
FAULT ISOLATION why the TM1 is taking more current.
Note: This fault can be sometimes transient.If no trouble is found,
check for any welding symptoms of power contactor tips. Clean
the tips and ensure the control air pressure is set to 5 Kg/cm2

Display to Driver Yes

Ver 2 Ver 2A Ver 3 Ver 4

Applicable for
YES YES YES YES

PARAMETER DESCRIPTION
FAULT CODE 1103
P32 Stuck Closed without Aux Contact ON. Check if Contact
FAULT MESSAGE
welded.
RESTRICTIONS Series Motoring & Dynamic Braking prohibited.
ALARM BELL 30 seconds
Medium, Manual
RESET LEVEL After manual reset if the fault still present, the fault will be generated
again.
FAULT RECOVERY -
1. Defective P32 contactor.
2. Defective aux. interlock of P32 contactor.
PROBABLE CAUSES 3. Defective wiring.
4. Defective TM2AI current sensor.
5. Due to control air pressure below 2kg/ cm2.
This message will log whenever Traction Motor 2 current is sensed
through TM2AI but P32 contactor aux. interlock feed back is not
sensed. Delayed operation of contactor or contactor stuck in mid
position can cause the above fault.
1. Check the status of the P32 power contactor. If the contactor is
stuck in mid position replace the contactor.
2. If the contactor is normal,
A. Check the operation of the power contactor by manually
operating the magnetvalve. Ensue that the contactor is
FAULT ISOLATION operating freely with out any delay. If the contactor is sluggish
in operation replace the contactor.
B. Run manual test for the power contactor and ensure the
feedback is detected correctly by the system.
3. If the Feed back is not detected by the system in the manual test,
A. Check the digital input status on corresponding digital input
card.
a. If the digital input LED is not glowing while the contactor
pick up, check the voltage between wires P32 FB and 4
wire.

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PARAMETER DESCRIPTION
(1) If Voltage is more than 65V, then the digital output
connector of cable is slack or the wire P32FB is
open circuited. Identify and rectify. If necessary
replace the cable.
(2) If voltage is zero, check the voltage between 51
and 4 at the auxiliary contact of P32.
(i) If voltage is more than 65V, the Aux. contact
is bad. Replace the aux. contacts of power
contactor.
(ii) If the voltage is zero, wire loop of 51 wire is
defective. Identify and replace.
4. If every thing is normal, set the display mode to wheel slip mode.
Creat a fault of any parallel contactor stuck closed. Set the loco
to motoring 1st notch with brakes applied.
A. Compare the TM2 current with all other TM currents.
FAULT ISOLATION
B. If the TM2 current is abnormally high, sum up all the
TMcurrents and compare with Tr. alternator current.
a. If the difference is more or less equal to excess current
of TM2 then,
(1) TM2AI sensor might be defective. Replace the
current sensor and check up.
(2) Analog input card might be defective. Replace the
card and check up.
b. If both the TAAI and sum up currents are more or less
equal, check the TM2 power circuit and traction motor
why the TM2 is taking more current.

Note: This fault can be sometimes transient. If no trouble is found,

check for any welding symptoms of power contactor tips. Clean the
tips and ensure the control air pressure is set to 5 Kg/ cm2.
Display to Driver Yes

Ver 2 Ver 2A Ver 3 Ver 4

Applicable for
YES YES YES YES

IM-203 rev 0 115

Chapter 3 - High Priority Faults Medha Servo Drives Pvt Ltd.

PARAMETER DESCRIPTION
FAULT CODE 1104
P22 Stuck closed without Aux contact ON. Check if contact
FAULT MESSAGE
welded.
RESTRICTIONS Series Motoring & Dynamic Braking prohibited.
ALARM BELL 30 seconds
Medium, Manual
RESET LEVEL After manual reset if the fault still present, the fault will be generated
again.
FAULT RECOVERY --
1. Defective P22 contactor.
2. Defective aux. interlock of P22 contactor.
PROBABLE CAUSES 3. Defective wiring.
4. Defective TM3AI current sensor.
5. Due to control air pressure below 2kg/cm2.
This message will log whenever Traction Motor 3 current is sensed
through TM3AI but P22 contactor aux. interlock feed back is not
sensed. Delayed operation of contactor or contactor stuck in mid
position can cause the above fault.
1. Check the status of the P22 power contactor. If the contactor is
stuck in mid position replace the contactor.
2. If the contactor is normal,
A. Check the operation of the power contactor by manually
operating the magnetvalve. Ensue that the contactor is
operating freely with out any delay. If the contactor is
sluggish in operation replace the contactor.
B. Run manual test for the power contactor and ensure the
feedback is detected correctly by the system.
3. If the Feed back is not detected by the system in the manual test,
A. Check the digital input status on corresponding digital input
card.
a. If the digital input LED is not glowing while the contactor
pick up, check the voltage between wires P22 FB and 4
wire.
(1) If Voltage is more than 65V, then the digital out put
connector of cable is slack or the wire P22FB is
open circuited. Identify and rectify. If necessary
FAULT ISOLATION replace the cable.
(2) If voltage is zero, check the voltage between 51 and
4 at the auxiliary contact of P22.
(i) If voltage is more than 65V, the Aux. Contact is
bad. Replace the aux. Contacts of power
contactor.
(ii) If the voltage is zero, wire loop of 51 wire is defective. Identify
and replace
4. If every thing is normal, Set the display mode to wheel slip
mode. Creat a fault of any parallel contactor stuck closed. Set
the loco to motoring 1st notch with brakes applied.
A. Compare the TM3 current with all other TM currents.
B. If the TM3 current is abnormally high, Sum up all the TM
currents and compare with Tr. Alternator current.
a. If the difference is more or less equal to excess current of TM3
then,
(1) TM3AI sensor might be defective. Replace the
current sensor and check up.
(2) Analog input might be defective. Replace the card
and check up.
b. If both the TAAI and sum up currents are more or less
equal, check the TM3 power circuit and traction motor
why the TM3 is taking more current.
116 IM-203 rev 0
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PARAMETER DESCRIPTION
Note: This fault can be sometimes transient. If no trouble is found,
FAULT ISOLATION check for any welding symptoms of power contactor tips. Clean
the tips and ensure the control air pressure is set to 5 Kgs/ cm2.
Display to Driver Yes

Ver 2 Ver 2A Ver 3 Ver 4

Applicable for
YES YES YES YES

PARAMETER DESCRIPTION
FAULT CODE 1105
FAULT MESSAGE P1 Stuck Closed without Aux Contact ON. Check if Contact welded.
RESTRICTIONS Series Motoring & Dynamic Braking prohibited.
ALARM BELL 30 seconds
Medium, Manual
RESET LEVEL After manual reset if the fault still present, the fault will be generated
again.
FAULT RECOVERY -
1. Defective P1 contactor.
2. Defective aux. interlock of P1 contactor.
PROBABLE CAUSES 3. Defective wiring.
4. Defective TM4AI current sensor.
5. Due to control air pressure below 2kg per cm sq.
This message will log whenever Traction Motor 4 current is sensed
through TM4AI but P1 contactor aux. interlock feed back is not
sensed. Delayed operation of contactor or contactor stuck in mid
position can cause the above fault.
1. Check the status of the P1 power contactor. If the contactor is
stuck in mid position replace the contactor.
2. If the contactor is normal,
A. Check the operation of the power contactor by manually
operating the magnetvalve. Ensue that the contactor is
operating freely with out any delay. If the contactor is sluggish
in operation replace the contactor.
B. Run manual test for the power contactor and ensure the
feedback is detected correctly by the system.
FAULT ISOLATION 3. If the Feed back is not detected by the system in the manual test,
A. Check the digital input status on corresponding digital input
card.
a. If the digital input LED is not glowing while the contactor
pick up, check the voltage between wires P1 FB and 4
wire.
(1) If Voltage is more than 65V, then the digital output connector
of cables slack or the wire P1FB is open circuited. Identify
and rectify. If necessary, replace the cable.
(2) If voltage is zero, check the voltage between 51
and 4 at the auxiliary contact of P1.
(i) If voltage is more than 65 V, the Aux.contact
is bad. Replace the aux. Contacts of power
contactor.

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PARAMETER DESCRIPTION
(ii) If the voltage is zero, wire loop of 51 wire is
defective. Identify and replace.
4. If every thing is normal, set the display mode to wheel slip mode.
Create a fault of any parallel contactor stuck closed. Set the loco
to motoring 1st notch with brakes applied.
A. Compare the TM4 current with all other TM currents.
B. If the TM4 current is abnormally high, sum up all the TM
currents and compare with Tr. Alternator current.
a. If the difference is more or less equal to excess current
of TM4 then,
FAULT ISOLATION (1) TM4AI sensor might be defective. Replace the
current sensor and check up.
(2) Analogue input card might be defective. Replace
the card and check up.
b. If both the TAAI and sum up currents are more or less
equal, check the TM4 power circuit and traction motor
why the TM4 is taking more current.

Note: This fault can be sometimes transient. If no trouble is found,

check for any welding symptoms of power contactor tips. Clean the
tips and ensure the control air pressure is set to 5 Kg/ cm2
Display to Driver Yes

Ver 2 Ver 2A Ver 3 Ver 4

Applicable for
YES YES YES YES

118 IM-203 rev 0

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PARAMETER DESCRIPTION
FAULT CODE 1106
FAULT MESSAGE P31 Stuck Closed without Aux Contact ON. Check if Contact welded.
RESTRICTIONS Series Motoring & Dynamic braking prohibited.
ALARM BELL 30 seconds
Medium, Manual
RESET LEVEL After manual reset if the fault still present, the fault will be generated
again.
FAULT RECOVERY
1. Defective P31 contactor.
2. Defective aux. interlock of P31 contactor.
PROBABLE CAUSES 3. Defective wiring.
4. Defective TM5AI current sensor.
5. Due to control air pressure below 2kg/ cm2.
This message will log whenever Traction Motor 5 current is sensed
through TM3AI but P31 contactor aux. interlock feed back is not
sensed. Delayed operation of contactor or contactor stuck in mid
position can cause the above fault.

1. Check the status of the P31 power contactor. If the contactor is

stuck in mid position replace the contactor.
2. If the contactor is normal,
A. Check the operation of the power contactor by manually
operating the magnet valve. Ensure that the contactor is
operating freely with out any delay. If the contactor is sluggish
in operation replace the contactor.
B. Run manual test for the power contactor and ensure the
feedback is detected correctly by the system.
3. If the Feedback is not detected by the system in the manual test,
A. Check the digital input status on corresponding digital input
card.
a. If the digital input LED is not glowing while the contactor
pick up, check the voltage between wires P31 FB and 4
wire.
FAULT ISOLATION (1) If Voltage is more than 65 V, then the connector of
cable digital output card is slack or the wire P31FB
is open circuited. Identify and rectify. If necessary
replace the cable.
(2) If voltage is zero, check the voltage between 51
and 4 at the auxiliary contact of P31.
(i) If voltage is more than 65V, the Aux. Contact
is bad. Replace the aux. Contacts of power
contactor.
(ii) If the voltage is zero, wire loop of 51 wire is
defective. Identify and replace.
4. If every thing is normal, Set the display mode to wheel slip mode.
Creat a fault of any parallel contactor stuck closed. Set the loco
to motoring 1st notch with brakes applied.
A. Compare the TM5 current with all other TM currents.
B. If the TM5 current is abnormally high, Sum up all the TM
currents and compare with Tr. Alternator current.
Note: This fault can be sometimes transient. If no trouble is
found, check for any welding symptoms of power contactor
tips. Clean the tips and ensure the control air pressure is set
to 5 Kgs/ cm2..

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PARAMETER DESCRIPTION
Display to Driver Yes

Ver 2 Ver 2A Ver 3 Ver 4

Applicable for
YES YES YES YES

Applicable for
NO YES YES YES

PARAMETER DESCRIPTION
FAULT CODE 1116
FAULT MESSAGE EDBR / EDBCx stuck closed.
RESTRICTIONS Dynamic Braking Prohibited.
ALARM BELL 30 seconds.
RESET LEVEL low
Automatic when EDBR / EDB Contactor feedback signals status is
normal. Manual fault clearing through keyboard on the display unit.
FAULT RECOVERY
(If the fault condition is still present when cleared manually, the fault
is generated again)
1. Defective EDB Relay.
PROBABLE CAUSES 2. Any one of the EDB Contactor stuck closed.
3. Defective wiring.
Check weather all the EDB Contactors are in picked up conditions.
FAULT ISOLATION Set the master handle position to IDLE position.
1. If all the EDBC contactors are in picked up position

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Chapter 3 - High Priority Faults Medha Servo Drives Pvt Ltd.

PARAMETER DESCRIPTION
A. Check the status of EDB Relay.
a. If the relay is in ON position,
i. The EDB relay might be defective. Replace the relay.
ii. Digital output card might be defective. Replace the
card.
b. If the relay is normal position, check the status of the
EDB contactors.
2. If any one contactor is in stuck closed condition, replace the
contactor.
FAULT ISOLATION
3. If no EDB contactor is in stuck closed position, check the EDBC,
NC and NO digital inputs status on the corresponding digital input
card.
A. EDBC, NC interlock digital input should on and EDBC, NO
interlock digital input should off on the corresponding digital
input card.
B. If EDBC, NO interlock digital input is getting supply then
wrong wiring in EDBC contactor's interlocks. Identify and
eliminate the fault.
Display to Driver Yes

Ver 2 Ver 2A Ver 3 Ver 4

Applicable for
NO NO YES YES

PARAMETER DESCRIPTION
FAULT CODE 6001
FAULT MESSAGE FSC21 circuit open fault
RESTRICTIONS Field Shunting Prohibited
ALARM BELL 30 seconds.
RESET LEVEL Medium
Automatic when the FSC21 contactor is found closed.
Automatic Fault Reset is permitted for maximum 3 times in an hour
at IDLE, after which manual clearing is required.
FAULT RECOVERY
Manual fault clearing through keyboard on the display unit. (If the
fault condition is still present when cleared manually, the fault will be
generated again)
1. Defective FS contactor
2. Defective interlocks.
PROBABLE CAUSES
3. Defective wiring/ broken/ disconnected wires at the coil and FS
Relay interlocks.
This fault will be logged only in WDM3D locomotives and FSC21
contactor is not operated during weak field transition.
1. Operate the FSR either manually or through display unit by
selecting manual output test or transition test mode.
2. With FS relay pick up, check the status of all the FS contactors.
All FS contactors should pick up.
A. If any FS contactor is not picking up, check the voltage
FAULT ISOLATION
across the coil.
B. If voltage is available but the contactor is not picking up,
replace the contactor.
C. If voltage is not available, check the wiring of the FSC
contactor.
a) Check the voltage between locomotive 4 wire and FS1/
FS2/ FS3 wire on the contactor.

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1) If voltage is zero, no positive supply is coming from

FSR interlocks. Identify the open circuited wires and
replace.
b) Check the voltage between 4 wires at the FS contactor
terminal and locomotive 13/51 wire.
1) If voltage is zero, 4wire loop coming to FS contactors
is open circuited. Identify the open circuited wires
and replace.
3. With all FS contactors are picking up but still the fault is logged,
FAULT ISOLATION check the status of the digital input LED on the corresponding
Digital input card.
A. If the digital input LED is not glowing then the FS contactor
interlock is bad. Check the incoming supply between wire
51/13 and locomotive 4 wire.
a) If the voltage is more than 65V, then the interlock is bad.
Replace the FS contactor.
b) If there is no voltage, then 51/13 wire loop coming to FS
contactor is bad. Identify and correct the wiring loop of
51/13.
Display to Driver Yes

Ver 2 Ver 2A Ver 3 Ver 4

Applicable for
NO NO YES YES

Applicable for
NO NO YES YES

PARAMETER DESCRIPTION
FAULT CODE 6008
FAULT MESSAGE Field Shunting Contactor FS22 Stuck Closed.
RESTRICTIONS Motoring with Field Shunt only, Dynamic Brake Prohibited.
ALARM BELL 30 seconds.
RESET LEVEL Medium
Automatically recovers when FS22 auxiliary contact is found as open.
Manual fault clearing through keyboard on the display unit. (If the
FAULT RECOVERY
fault condition is still present when cleared manually, the fault will be
generated again)
1. FS contactor tips welded.
PROBABLE CAUSES 2. Contactor stuck closed due to mechanical obstruction.
3. Defective Wiring / Wrong supply to FS contactor coil.
Set the master handle to IDLE position.
FAULT ISOLATION
1. Check the status of FS Relay. It should be in OFF position.

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Chapter 3 - High Priority Faults Medha Servo Drives Pvt Ltd.

PARAMETER DESCRIPTION
2. Check the status of the FS contactor. If the contactor is in closed
position, check the voltage across the operating coil.
A. If voltage is more than 65 volts, then the wiring is fault.
Identify the wrong supply coming to FS contactor coil and
rectify.
B. If there is no voltage, then the FS contactor is defective.
Replace the contactor.
FAULT ISOLATION 3. If the contactor is not in closed position but still the fault is logged,
check the status of the interlock.
A. If the interlock is in physically open but the fault is logged
then wrong supply is coming to FS22 feed back wire. Identify
and remove the wrong supply.
B. If the interlock is in closed/ welded condition but the main
contactor is in open status, then the contactor is defective.
Replace the contactor.
Display to Driver Yes

TE
This fault will be logged only when “Series field shunt enabled (or) Parallel
NO
field shunt enabled flag is configured as high(√).

Chapter 3 - High Priority Faults Medha Servo Drives Pvt Ltd.

PARAMETER DESCRIPTION
FAULT CODE 6025
AIR BRAKE FAULT - [076(EBV B)]
FAULT MESSAGE
BRAKE CONTROLLER NUMBER 2 FAILURE
RESTRICTIONS None
ALARM BELL 30 seconds.
RESET LEVEL High
FAULT RECOVERY Automatically recovers, when the fault is recovered by CCB.
These are the faults declared by Computer controlled Braking system.
PROBABLE CAUSES For easy downloading purpose, they are recorded in MEP fault data
pack.
FAULT ISOLATION Troubleshoot as per the CCB maintenance manual.
Display to Driver Yes

Note: This fault will be logged only when “CCB connected” flag is configured as
TE
NO high (√)

Ver 2 Ver 2A Ver 3 Ver 4

Applicable for
NO NO YES YES

PARAMETER DESCRIPTION
FAULT CODE 6026
BKT/ REV circuit open during motoring for TM4 Or Problem in Power
FAULT MESSAGE
Circuit
RESTRICTIONS Traction Motor 4 cutout, Dynamic Brake Prohibited.
ALARM BELL 30 seconds.
Medium,Manual
RESET LEVEL After manual reset if the fault is still present, the fault is generated
again.
FAULT RECOVERY none
1. Defective BKT contactor.
2. Defective REV contactor.
PROBABLE CAUSES 3. Defective wiring.
4. Foreign materials fallen in between BKT(R2)/REV (L2)
contacts.
1. Set the locomotive operation to motoring. Take necessary
precautions to move the locomotive.
2. Set the display mode to wheel slip.
3. Open 1st Notch and observe the traction motor currents. If all the
traction motor currents are equal, there could be momentary open
circuit in the traction motor cable to REV (L2) cables while on run.
A. Check up the traction motor cables for any open circuited to
FAULT ISOLATION REV (L2) contact.
4. If the current in traction motor No.4 is showing Low,
A. Observe for any foreign materials in between REV contacts.
If found, remove them and attend REV (L2) contacts.
5. If the wheel is rotating freely and REV (L2) contacts are free from
foreign materials and still traction motor current is showing Low
as compared to other motors, the TM4AI sensor might be
defective. Replace the sensor and check up.
Display to Driver Yes

144 IM-203 rev 0

Medha Servo Drives Pvt Ltd. MEP Troubleshooting Manual

Applicable for
NO NO YES YES

PARAMETER DESCRIPTION
FAULT CODE 6030
FAULT MESSAGE SLBC2 Closed Without Feed Back in Motoring.
RESTRICTIONS Motoring Prohibited, Dynamic Brake Prohibited
ALARM BELL 30 seconds.
Medium,Manual
RESET LEVEL After manual reset if the fault is still present, the fault is generated
again.
FAULT RECOVERY none
1. Defective SLBC2 contactor.
2. Defective wiring.
PROBABLE CAUSES
3. Foreign materials fallen in between SLBC2 (A3) to SLBC2
(R11) contacts.
IM-203 rev 0 147
Chapter 3 - High Priority Faults Medha Servo Drives Pvt Ltd.

PARAMETER DESCRIPTION
1. Set the locomotive operation to motoring. Take necessary
precautions to move the locomotive.
2. Set the display mode to wheel slip.
3. Open 1st notch and observe the traction motor currents. If
all the traction motor currents are equal, there could be
momentary short-circuited in the traction motor TM3AI (A3)
to SLBC2 (R11) cables while on run.
1. Check up the traction motor cables for any short circuit
between TM3AI (A3) to SLBC2 (R11) contact.
FAULT ISOLATION 4. If the current in traction motor No.3 is showing high,
1. Observe for any foreign materials in between TM3AI
(A3) to SLBC2 (R11)contacts. If found, remove them and
attend to TM3AI (A3) to SLBC2 (R11) contacts.
Note:
A. If SLBC2 closed without feedback, then TM 3 currents shows high
current with respect to other TM currents.
B. If this fault logged at high speed, then grid resistor might be open.
So check grid resistance also once.
C. Check TM current sensors health before doing this.
Display to Driver Yes

This Error message is generated only “SLBC Closed Without feed back Detec-
TE tion Enabled.” flag set (√).
NO

Ver 2 Ver 2A Ver 3 Ver 4

Applicable for
NO NO YES YES

PARAMETER DESCRIPTION
FAULT CODE 6031
FAULT MESSAGE SLBC3 Closed Without Feedback in Motoring.
RESTRICTIONS Motoring Prohibited, Dynamic Brake Prohibited
ALARM BELL 30 seconds.
Medium,Manual
RESET LEVEL After manual reset if the fault is still present, the fault is generated
again.
FAULT RECOVERY none
1. Defective SLBC3 contactor.
2. Defective wiring.
PROBABLE CAUSES
3. Foreign materials fallen in between SLBC3 (A2) to SLBC3
(R24) contacts.
1. Set the locomotive operation to motoring. Take necessary
precautions to move the locomotive.
2. Set the display mode to wheel slip.
3. Open 1st notch and observe the traction motor currents. If
all the traction motor currents are equal, there could be
FAULT ISOLATION momentary short-circuited in the traction motor TM2AI (A2)
to SLBC3 (R24) cables while on run.
1. Check up the traction motor cables for any short circuit
between TM2AI (A2) to SLBC3 (R24)contact.
4. If the current in traction motor No.2 is showing high,

148 IM-203 rev 0

Medha Servo Drives Pvt Ltd. MEP Troubleshooting Manual

PARAMETER DESCRIPTION
1. Observe for any foreign materials in between TM2AI
(A2) to SLBC3 (R24)contacts. If found, remove them and
attend to TM2AI (A2) to SLBC3 (R24) contacts.
Note:
A. If SLBC3 closed without feedback, then TM 3 currents shows high
FAULT ISOLATION current with respect to other TM currents.
B. If this fault logged at high speed, then grid resistor might be open.
So check grid resistance also once.
C. Check TM current sensors health before doing this.

Display to Driver Yes

This Error message is generated only “SLBC Closed Without feed back Detec-
TE tion Enabled.” flag set (√).
NO

Applicable for
NO NO YES YES

PARAMETER DESCRIPTION
FAULT CODE 6064
AIR BRAKE FAULT - [ 141 ]
FAULT MESSAGE
AUXILIARY INPUT/OUTPUT FAILURE
RESTRICTIONS None
ALARM BELL 30 seconds.
RESET LEVEL High
FAULT RECOVERY Automatically recovers when Fault Recovered by CCB.
These are the faults declared by computer controlled brake system.
PROBABLE CAUSES For easy down loading purpose they are recorded in MEP fault data
pack.
FAULT ISOLATION Trouble shoot as per the CCB maintenance manual.
Display to Driver Yes

This fault will be logged only when “CCB connected & CCBV2.0 SW Enable ” flag
TE enabled set (√)
NO

Ver 2 Ver 2A Ver 3 Ver 4

Applicable for
NO NO YES YES

IM-203 rev 0 165

Chapter 3 - High Priority Faults Medha Servo Drives Pvt Ltd.

K
AN
BL
FT
LE
Y
LL
NA
IO
NT
TE
IN
IS
GE
PA
I S
TH

166 IM-203 rev 0

Chapter 4

MEDIUM PRIORITY FAULTS

PARAMETER DESCRIPTION
FAULT CODE 1118
FAULT MESSAGE Excess Current in Traction Motor 1
RESTRICTIONS Maximum TM Current LIMITED.
ALARM BELL 5 seconds
Low, Manual
RESET LEVEL After manual reset if the fault still present, the fault will be generated
again.
FAULT RECOVERY Automatic when traction motors get cooled.
Driver might have worked more time than the stipulated time in the
PROBABLE CAUSES
restricted zone of the load meter.
FAULT ISOLATION The fault will get reset automatically.
DISPLAY TO DRIVER Yes

Ver2 Ver2A Ver3 Ver4

Ver2 Ver2A Ver3 Ver4

Applicable for
YES YES YES YES

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Chapter 4 - Medium Priority Faults Medha Servo Drives Pvt Ltd.

PARAMETER DESCRIPTION
FAULT CODE 1125
S21 Contactor circuit open. Run Auto/manual test.
FAULT MESSAGE
Power Limited. Power circuit problem
Nil
RESTRICTIONS Note :Reference power is reduced by 1/3 times of such faults while
motoring in 2S-3P mode.
ALARM BELL 5 seconds
Low, Manual
RESET LEVEL After manual reset if the fault still present, the fault will be generated
again.
FAULT RECOVERY. Automatic when S21 power contactor closes.
1. Defective power contactor.
2. Bad wiring.
3. Slackness in digital output connector at MEP.
PROBABLE CAUSES
4. Defective digital output card .
5. Slackness in digital input connector at MEP
6. Due to low control air pressure, below 5kg/cm2.
This fault will be logged due to delayed/ sluggish operation of power
contactors. The fault may not exist while troubleshooting. In such case
check and ensure that the power contactor is operating freely and the
auxiliary contact is having sufficient over travel and pressure.
1. Check and ensure control air pressure is 5 Kg/ cm2. If control air
pressure is less/excess adjust to 5 Kg/ cm2
2. Operate the power contactor manually by pressing armature plate
of the magnet valve.
3. If the power contactor is not operating:
A. Defective pneumatic pipeline. Check and replace the pipeline.
B. Defective magnet valve. Check and replace.
C. Defective power contactor. Check and replace.
4. If the power contactor is operating, set up the display to ‘Manual
Test for Outputs’ under ‘Test Mode’ menu option.
5. Select S21CL and press ‘Enter’ key to test S21 power contactor
operation.
6. Press 1/ F2 to energise the S21 contactor.
7. If S21 is not picking up, check voltage at the power contactor
magnet valve terminals.
A. If the voltage is more than 65V, magnet valve coil is defective.
FAULT ISOLATION Replace the magnet valve.
8. If the voltage is zero, check voltage at coil terminal (51N/ 13N)
with respect to locomotive 4 wire.
A. If the voltage is zero, check the continuity of 51N/ 13N loop
coming to magnet valve coil. Check and replace open circuited
wire/wrong connection.
9. If the voltage is more than 60 V, Check the supply voltage between
loco wire 50 and magnet valve coil terminal S21CL.
A. If voltage is zero, there is no continuity of wire S21CL from
MEP to magnet valve.
a. Check slackness of digital output connector at MEP. If slack
tighten the connector.
b. Check the continuity of S21CL wire from MEP to magnet
valve coil terminal. If necessary replace the cable.
c. If the continuity is good and there is no slackness in
connector, then the digital output card is defective. Replace
the card.
10. If S21 is picking up, check the status of Green LED on the digital
input card .
11. If the Green LED is not glowing check Voltage at auxiliary contact
(wire No. 51) with respect to locomotive 4 wire.
172 IM-203 rev 0
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A. If voltage is zero, check the continuity of 51-wire loop coming

to S21 power contactor auxiliary contact.
12. If voltage is more than 65V, then check voltage at auxiliary contact
(wire no. S21FB) with respect to locomotive 4 wire.
A. If voltage is zero, the auxiliary contact is bad. Replace the
auxiliary contacts.
13. If voltage is more than 65 V,
A. Check the slackness of digital input connector at MEP. If slack
FAULT ISOLATION tighten and check the LED status.
B. Check the continuity of Wire S21FB from S21 power contactor
to digital input connector. If necessary replace the cable.
14. If the Green LED is glowing, the corresponding Yellow LED on
the same card should glow. Otherwise yellow LED is defective.
Change the Digital input card.
15. If Both Green and Yellow LEDs are glowing on the digital input
card the feed back status should be displayed ON. Toggle the
S21 contactor two to three times and ensure the feedback signal
is changing accordingly.
DISPLAY TO DRIVER Yes

Ver2 Ver2A Ver3 Ver4

Applicable for
YES YES YES YES

IM-203 rev 0 173

Chapter 4 - Medium Priority Faults Medha Servo Drives Pvt Ltd.

PARAMETER DESCRIPTION
FAULT CODE 1126
S31 Contactor circuit open. Run Auto/ manual test.
FAULT MESSAGE
Power Limited. Power circuit problem
Nil
RESTRICTIONS Note: Reference power is reduced by 1/3 times of such faults while
motoring in 2S-3P mode.
ALARM BELL 5 seconds
Low, Manual
RESET LEVEL After manual reset if the fault is still present, the fault is generated
again.
FAULT RECOVERY Automatic when S31 power contactor closes.
1. Defective power contactor.
2. Bad wiring.
3. Slackness in digital output connector at MEP.
PROBABLE CAUSES 4. Defective digital output card.
5. Slackness in digital input connector at MEP.
6. Due to low control air pressure, below 5kg/cm2.
This fault will be logged due to delayed/ sluggish operation of power
contactors. The fault may not exist while troubleshooting. In such
case check and ensure that the power contactor is operating freely
and the auxiliary contact is having sufficient over travel and pressure.
1. Check and ensure control air pressure is 5 kg/cm2. If control air
pressure is less/excess adjust to 5 kg/cm2
2. Operate the power contactor manually by pressing armature plate
of the magnet valve.
3. If the power contactor is not operating:
A. Defective pneumatic pipeline. Check and replace the pipeline.
B. Defective magnet valve. Check and replace.
C. Defective power contactor. Check and replace.
4. If the power contactor is operating, set up the display to ‘Manual
Test for Outputs’ under ‘Test Mode’ menu option.
5. Select S31CL and press ‘Enter’ key to test S31 power contactor
operation.
6. Press 1/F2 to energise the S31 contactor.
7. If S31 is not picking up, check voltage at the power contactor
magnet valve terminals.
FAULT ISOLATION A. If the voltage is more than 65V, magnet valve coil is defective.
Replace the magnet valve.
8. If the voltage is zero, check voltage at coil terminal (51N/13N)
with respect to locomotive 4 wire.
A. If the voltage is zero, check the continuity of 51N/13N loop
coming to magnet valve coil. Check and replace open
circuited wire/wrong connection.
9. If the voltage is more than 60 V, Check the supply voltage
between loco wire 50 and magnet valve coil terminal S31CL.
A. If voltage is zero, there is no continuity of wire S31CL from
MEP to magnet valve.
a) Check slackness of digital output connector at MEP. If slack
tighten the connector.
b) Check the continuity of S31CL wire from MEP to magnet
valve coil terminal. If necessary replace the cable.
c) If the continuity is good and there is no slackness in
connector, then the digital output card is defective. Replace
the card.
10. If S31 is picking up, check the status of Green LED on the digital
input card .

174 IM-203 rev 0

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PARAMETER DESCRIPTION

Medha Servo Drives Pvt Ltd. MEP Troubleshooting Manual

11. If the Green LED is not glowing check Voltage at auxiliary contact
(wire No. 51) with respect to locomotive 4 wire.
A. If voltage is zero, check the continuity of 51-wire loop coming
to P31 power contactor auxiliary contact.
12. If voltage is more than 65V, then check voltage at auxiliary contact
(wire no. P31FB) with respect to locomotive 4 wire.
A. If voltage is zero, the auxiliary contact is bad. Replace the
auxiliary contacts.
13. If voltage is more than 65 V,
A. Check the slackness of digital input connector at MEP. If
slack tighten and check the LED status.
B. Check the continuity of Wire P31FB from P31 power contac-
tor to digital input connector. If necessary replace the cable.
14. If the Green LED is glowing, the corresponding Yellow LED on
the same card should glow. Otherwise yellow LED is defective.
Change the Digital input card.
15. If Both Green and Yellow LEDs are glowing on the digital input
card the feed back status should be displayed ON. Toggle the
P31 contactor two to three times and ensure the feedback signal
is changing accordingly.

DISPLAY TO DRIVER Yes

Ver2 Ver2A Ver3 Ver4

Applicable for
YES YES YES YES

IM-203 rev 0 181

Chapter 4 - Medium Priority Faults Medha Servo Drives Pvt Ltd.

PARAMETER DESCRIPTION
FAULT CODE 1130
P2/P1(WDP1) contactor circuit open. Run Auto/manual test.
FAULT MESSAGE
Power Limited. Power circuit problem
Nil
RESTRICTIONS Note: Reference power is reduced by 1/6 times of such faults while
motoring in 6P mode.
ALARM BELL 5 seconds
Low, Manual
RESET LEVEL After manual reset if the fault is still present, the fault is generated
again.
FAULT RECOVERY Automatic when P2/ P1 power contactor closes.
1. Defective power contactor.
2. Bad wiring.
3. Slackness in digital output connector at MEP.
PROBABLE CAUSES 4. Defective digital output card.
5. Slackness in digital input connector at MEP.
6. Due to low control air pressure, below 5kg/ cm2.
This fault will be logged due to delayed/ sluggish operation of power
contactors. The fault may not exist while troubleshooting. In such
case check and ensure that the power contactor is operating freely
and the auxiliary contact is having sufficient over travel and pres-
sure.
1. Check and ensure control air pressure is 5kg/ cm2 If control air
pressure is less/excess adjust to 5kg/ cm2.
2. Operate the power contactor manually by pressing armature
plate of the magnet valve.
3. If the power contactor is not operating:
A. Defective pneumatic pipeline. Check and replace the pipe-
line.
B. Defective magnet valve. Check and replace.
C. Defective power contactor. Check and replace.
4. If the power contactor is operating, set up the display to ‘Manual
Test for Outputs’ under ‘Test Mode’ menu option.
5. Select P2/ P1 CL and press ‘Enter’ key to test P2/P1 power
contactor operation.
6. Press 1/ F2 to energise the P2/P1 contactor.
7. If P2/ P1 is not picking up, check voltage at the power contactor
FAULT ISOLATION magnet valve terminals.
A. If the voltage is more than 65 V, magnet valve coil is defec-
tive. Replace the magnet valve.
8. If the voltage is zero, check voltage at coil terminal (51N/ 13N)
with respect to locomotive 4 wire.
A. If the voltage is zero, check the continuity of 51N/ 13N loop
coming to magnet valve coil. Check and replace open
circuited wire/wrong connection.
9. If the voltage is more than 60 V, Check the supply voltage be-
tween loco wire 50 and magnet valve coil terminal P2/ P1CL.
A. If voltage is zero, there is no continuity of wire P2 /P1CL
from MEP to magnet valve.
a) Check slackness of connector at MEP. If slack tighten the
connector.
b) Check the continuity of P2 /P1CL wire from MEP to mag-
net valve coil terminal. If necessary replace the cable.
c) If the continuity is good and there is no slackness in con-
nector, then the digital output card is defective. Replace
the card.
10. If P2/ P1 is picking up, check the status of Green LED on the
digital input card.
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PARAMETER DESCRIPTION
11. If the Green LED is not glowing check Voltage at auxiliary con-
tact (wire No. 51) with respect to locomotive 4 wire.
A. If voltage is zero, check the continuity of 51-wire loop com-
ing to P2/P1 power contactor auxiliary contact.
12. If voltage is more than 65V, then check voltage at auxiliary con-
tact (wire no. P2/P1FB) with respect to locomotive 4 wire.
A. If voltage is zero, the auxiliary contact is bad. Replace the
auxiliary contacts.
13. If voltage is more than 65 V,
A. Check the slackness of digital input connector at MEP. If
FAULT ISOLATION slack tighten and check the LED status.
B. Check the continuity of Wire P2/P1FB from P2/P1 power
contactor to digital input connector. If necessary replace the
cable.
14. If the Green LED is glowing, the corresponding Yellow LED on
the same card should glow. Otherwise yellow LED is defective.
Change the Digital input card.
15. If Both Green and Yellow LEDs are glowing on the digital input
card the feed back status should be displayed ON. Toggle the
P2/P1 contactor two to three times and ensure the feedback
signal is changing accordingly.
DISPLAY TO DRIVER Yes

Ver2 Ver2A Ver3 Ver4

Applicable for
YES YES YES YES

IM-203 rev 0 183

Chapter 4 - Medium Priority Faults Medha Servo Drives Pvt Ltd.

PARAMETER DESCRIPTION
FAULT CODE 1131
P22/P3 contactor circuit open. Run Auto/manual test.
FAULT MESSAGE
Power Limited. Power circuit problem
Nil
RESTRICTIONS Reference power is reduced by 1/6 times of such faults while mo-
toring in 6P mode.
ALARM BELL 5 seconds
Low, Manual
RESET LEVEL After manual reset if the fault is still present, the fault will be
generated again.
FAULT RECOVERY Automatic when P22/P3 power contactor closes.
1. Defective power contactor.
2. Bad wiring.
3. Slackness in digital output connector at MEP.
PROBABLE CAUSES 4. Defective digital output card.
5. Slackness in digital input connector at MEP.
6. Due to low control air pressure, below 5 kg/ cm2.
This fault will be logged due to delayed/ sluggish operation of power
contactors. The fault may not exist while troubleshooting. In such
case check and ensure that the power contactor is operating freely
and the auxiliary contact is having sufficient over travel and pressure.
1. Check and ensure control air pressure is 5 kg/ cm2 If control air
pressure is less/excess adjust to 5 kg/ cm2.
2. Operate the power contactor manually by pressing armature plate
of the magnet valve.
3. If the power contactor is not operating:
A. Defective pneumatic pipeline. Check and replace the pipeline.
B. Defective magnet valve. Check and replace.
C. Defective power contactor. Check and replace.
4. If the power contactor is operating, set up the display to ‘Manual
Test for Outputs’ under ‘Test Mode’ menu option.
5. Select P22/ P3 CL and press ‘Enter’ key to test P22/ P3 power
contactor operation.
6. Press 1/ F2 to energise the P22/P3 contactor.
7. If P22/ P3 is not picking up, check voltage at the power contactor
magnet valve terminals.
A. If the voltage is more than 65 V, magnet valve coil is
FAULT ISOLATION defective. Replace the magnet valve.
8. If the voltage is zero, check voltage at coil terminal (51N/ 13N)
with respect to locomotive 4 wire.
A. If the voltage is zero, check the continuity of 51N/ 13N loop
coming to magnet valve coil. Check and replace open
circuited wire/ wrong connection.
9. If the voltage is more than 60 V, Check the supply voltage
between loco wire 50 and magnet valve coil terminal P22/ P3CL.
A. If voltage is zero, there is no continuity of wire P22/ P3CL
from MEP to magnet valve.
a) Check slackness of connector at MEP. If slack tighten the
connector.
b) Check the continuity of P22/ P3CL wire from MEP to
magnet valve coil terminal. If necessary replace the cable.
c) If the continuity is good and there is no slackness in
connector, then the digital output card is defective.
Replace the card.
10. If P22/ P3 is picking up, check the status of Green LED on the
digital input card.
11. If the Green LED is not glowing check Voltage at auxiliary contact
(wire No. 51) with respect to locomotive 4 wire.

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PARAMETER DESCRIPTION
A. If voltage is zero, check the continuity of 51-wire loop coming
to P22/ P3 power contactor auxiliary contact.
12. If voltage is more than 65V, then check voltage at auxiliary contact
(wire no. P22/ P3FB) with respect to locomotive 4 wire.
A. If voltage is zero, the auxiliary contact is bad. Replace the
auxiliary contacts.
13. If voltage is more than 65 V,
A. Check the slackness of digital input connector at MEP. If slack
tighten and check the LED status.
FAULT ISOLATION B. Check the continuity of Wire P22/ P3FB from P22/ P3 power
contactor to digital input connector. If necessary replace the
cable.
14. If the Green LED is glowing, the corresponding Yellow LED on
the same card should glow. Otherwise yellow LED is defective.
Change the Digital input card.
15. If Both Green and Yellow LEDs are glowing on the digital input
card the feed back status should be displayed ON. Toggle the
P22/ P3 contactor two to three times and ensure the feedback
signal is changing accordingly.
DISPLAY TO DRIVER Yes

Ver2 Ver2A Ver3 Ver4

Applicable for
YES YES YES YES

IM-203 rev 0 185

Chapter 4 - Medium Priority Faults Medha Servo Drives Pvt Ltd.

PARAMETER DESCRIPTION
FAULT CODE 1132
P32/ P2 (WDP1) contactor circuit open. Run Auto/ manual test.
FAULT MESSAGE
Power Limited. Power circuit problem
Dynamic brake prohibited.
RESTRICTIONS Note: Reference power is reduced by 1/ 6 times of such faults while
motoring in 6P mode.
ALARM BELL 5 seconds.
Low, Manual
RESET LEVEL After manual reset if the fault is still present, the fault wll be generated
again.
FAULT RECOVERY Automatic when P32/P2 power contactor closes.
1. Defective power contactor.
2. Bad wiring.
3. Slackness in digital output connector at MEP.
PROBABLE CAUSES 4. Defective digital output card.
5. Slackness in digital input connector at MEP
6. Due to low control air pressure, below 5 kg/cm2.
This fault will be logged due to delayed / sluggish operation of power
contactors. The fault may not exist while troubleshooting. In such
case check and ensure that the power contactor is operating freely
and the auxiliary contact is having sufficient over travel and pressure.
1. Check and ensure control air pressure is 5 kg/cm2 If control air
pressure is less/excess adjust to 5 kg/cm2.
2. Operate the power contactor manually by pressing armature plate
of the magnet valve.
3. If the power contactor is not operating:
A. Defective pneumatic pipeline. Check and replace the pipeline.
B. Defective magnet valve. Check and replace.
C. Defective power contactor. Check and replace.
4. If the power contactor is operating, set up the display to ‘Manual
Test for Outputs’ under ‘Test Mode’ menu option.
5. Select P32/ P2 CL and press ‘Enter’ key to test P32/ P2 power
contactor operation.
6. Press 1/ F2 to energise the P32/ P2 contactor.
7. If P32/ P2 is not picking up, check voltage at the power contactor
magnet valve terminals.
A. If the voltage is more than 65V, magnet valve coil is defective.
FAULT ISOLATION Replace the magnet valve.
8. If the voltage is zero, check voltage at coil terminal (51N/ 13N)
with respect to locomotive 4 wire.
A. If the voltage is zero, check the continuity of 51N/ 13N loop
coming to magnet valve coil. Check and replace open
circuited wire/ wrong connection.
9. If the voltage is more than 60 V, Check the supply voltage
between loco wire 50 and magnet valve coil terminal P32/ P2CL.
A. If voltage is zero, there is no continuity of wire P32/ P2CL
from MEP to magnet valve.
a) Check slackness of connector of at MEP. If slack tighten
the connector.
b) Check the continuity of P32 /P2CL wire from MEP to
magnet valve coil terminal . If necessary replace the cable.
c) If the continuity is good and there is no slackness in
connector, then the digital output card is defective. Replace
the card.
10. If P32/ P2 is picking up, check the status of Green LED on the
digital input card.
11. If the Green LED is not glowing check Voltage at auxiliary contact
(wire No. 51) with respect to locomotive 4 wire.
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A. If voltage is zero, check the continuity of 51-wire loop coming

to P32/ P2 power contactor auxiliary contact.
12. If voltage is more than 65V, then check voltage at auxiliary contact
(wire no. P32/ P2FB) with respect to locomotive 4 wire.
A. If voltage is zero, the auxiliary contact is bad. Replace the
auxiliary contacts.
13. If voltage is more than 65 V,
A. Check the slackness of digital input connector at MEP. If slack
tighten and check the LED status.
B. Check the continuity of Wire P32/ P2FB from P32/P2 power
contactor to digital input connector. If necessary replace the
cable.
14. If the Green LED is glowing, the corresponding Yellow LED on
the same card should glow. Otherwise yellow LED is defective.
Change the Digital input card.
15. If Both Green and Yellow LEDs are glowing on the digital input
card the feed back status should be displayed ON. Toggle the
P32 contactor two to three times and ensure the feedback signal
is changing accordingly.
DISPLAY TO DRIVER Yes

Ver2 Ver2A Ver3 Ver4

Applicable for
YES YES YES YES

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PARAMETER DESCRIPTION
FAULT CODE 1133
FAULT MESSAGE EXPR circuit open. Run Auto/ manual tests
RESTRICTIONS Can't load excitation
ALARM BELL 5 seconds.
Low, Manual
RESET LEVEL After manual reset if the fault is still present, the fault is generated
again.
FAULT RECOVERY Automatic when EXPR circuit is detected as closed.
1. Defective EXPR relay
2. Defective wiring
PROBABLE CAUSES 3. Slackness of digital output Connector at MEP
4. Defective digital output card
5. Slackness of digital input Connector at MEP
After cranking wait for two minutes and check the status of EXPR
relay.
1. If EXPR relay is not picking up check the supply at EXPR relay
coil terminals.
A. If the voltage is more than 65 V, and still the relay is not
picking up then the EXPR relay is defective. Replace the
relay.
2. If the voltage is zero, check the voltage at coil terminal (Wire-51/
13) with respect to locomotive 4 wire.
A. If the voltage is zero, check the continuity of 51/ 13-wire loop
coming to EXPR relay. If necessary replace the open
circuited / wrong connections.
3. If voltage is more than 65V, check the voltage between locomo-
tive wire-50/13 and EXPR coil terminal.
A. If the voltage is zero
a) Check slackness of digital output connector at MEP. If the
cable is slack tighten.
b) Check continuity of wire EXPRCL from EXPR coil terminal
to MEP . If necessary replace the cable.
c) If continuity is good, then digital output card is defective.
4. If the EXPR relay is picking up, check the status of Green LED
FAULT ISOLATION
on the digital input card.
5. If LED is not glowing, check voltage at EXPR relay interlock
terminal (Wire No. 51)
A. If voltage is zero, check the continuity of wire 51 coming to
EXPR relay interlock. If necessary replace open circuited/
wrong connections.
6. If voltage is more than 65 V, check the voltage between
locomotive 50/ 51 wire and EXPRFB wire at EXPR interlock
terminal.
A. If the voltage is zero, the interlock contact is bad. Replace
the relay.
7. If the voltage is more than 65V,
A. check the slackness of the digital input connector at MEP.
If cable connector is slack, tighten the connector.
B. If connector is tight, check the continuity of the wire EXPRFB
from EXPR relay interlock to digital input connector. If
necessary, replace the cable.
8. If the Green LED is glowing and corresponding Yellow LED is
not glowing, the yellow LED is defective. Replace the digital input
card and check once again.
9. Run ‘Auto test for Relays’ under ‘Test Mode’ menu option.
DISPLAY TO DRIVER Yes

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Ver2 Ver2A Ver3 Ver4

Applicable for
YES YES YES YES

PARAMETER DESCRIPTION
FAULT CODE 1134
FAULT MESSAGE AGPR circuit open. Run Auto/manual test
RESTRICTIONS Batteries may not charge.
ALARM BELL 5 seconds.
Low, Manual
RESET LEVEL After manual reset if the fault is still present, the fault will be
generated again.
FAULT RECOVERY Automatic when AGPR circuit is detected as closed.
1. Defective AGPR relay
2. Defective wiring
PROBABLE CAUSES 3. Slackness of digital output Connector at MEP
4. Defective digital output card
5. Slackness of digital input Connector of cable at MEP
After cranking wait for two minutes and check the status of AGPR
relay.
1. If AGPR relay is not picking up, check the supply at AGPR relay
coil terminals.
A. If the voltage is more than 65V, and still the relay is not
picking up then the AGPR relay is defective. Replace the
relay.
2. If the voltage is zero, check the voltage at coil terminal (Wire-
51/13) with respect to locomotive 4 wire.
A. If the voltage is zero, check the continuity of 13/51-wire loop
coming to AGPR relay. If necessary replace the open
circuited / wrong connections.
3. If voltage is more than 65V, check the voltage between locomo-
tive 50 wire and AGPR coil terminal (wire No. AGPRCL).
A. If the voltage is zero
a) Check slackness of digital output connector at MEP. If the
cable is slack tighten.
b) Check continuity of wire AGPRCL from AGPR coil terminal
to digital output connector of MEP. If necessary replace
the cable.
c) If continuity is good, then digital output card is defective.
FAULT ISOLATION
4. If the AGPR relay is picking up, check the status of Green LED
on the digital input card.
5. If LED is not glowing, check voltage at AGPR relay interlock
terminal (Wire No.51)
A. If voltage is zero, check the continuity of wire 51 coming to
EXPR relay interlock. If necessary replace open circuited /
wrong connections.
6. If voltage is more than 65V, check the voltage between locomo-
tive 50/51 wire and AGPRFB wire at AGPR interlock terminal.
A. If the voltage is zero, the interlock contact is bad. Replace
the relay.
7. If the voltage is more than 65V,
A. check the slackness of digital input cable at MEP. If cable
connector is slack, tighten the connector.
B. If connector is tight, check the continuity of the wire AGPRFB
from AGPR relay interlock to digital input connector MEP.
If necessary replace the cable.
C. If the Green LED is glowing and corresponding Yellow LED
is not glowing, then the yellow LED is defective. Replace
the digital input connector card and check once again.
8. Run ‘Auto test for Relays’ under ‘Test Mode’ menu option.

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DISPLAY TO DRIVER Yes

Ver2 Ver2A Ver3 Ver4

Applicable for
YES YES YES YES

PARAMETER DESCRIPTION
FAULT CODE 1135
FAULT MESSAGE Both Direction inputs(TL0 & TL8) high at a time.
RESTRICTIONS Can't change direction
ALARM BELL 5 seconds.
Low, Manual
RESET LEVEL After manual reset if the fault is still present, the fault is generated
again.
FAULT RECOVERY Automatic when one of the train lines status has become zero.
1. Defective interlocking of master controller allowing the RH to
move forward or reverse while the master handle is in notch/
braking zone.
PROBABLE CAUSES 2. Loco is being controlled from more than one source.
3. Defective wiring/ jumper cable
Most probably this fault is of transient in nature. The fault may not
be available at the time of investigation.
1. If loco is coupled with another loco, remove the MU jumper cable.
2. Shut down the engine while doing the following tests.
3. Check for proper mechanical interlocking of both control stands.
Reverser Handle should not move when the master handle/
selector handle is set to notch/ brake position. If so replace the
defective master controller.
4. Keep both the reverser handles in neutral position.
5. Check the status of digital inputs TL0 & TL8 Green LEDs on the
digital input card.
6. If either TL8 Green LED or TL0 Green LED is glowing, then
defective wiring. Identify which wire is getting wrong supply and
isolate.
7. If both Green LEDs are OFF (TL0 & TL8 ).
FAULT ISOLATION
8. Apply loco brakes and ensure loco brakes are physically applied.
9. Set the Reverser Handle to Forward direction on Short hood
control stand.
10. Move the master handle to Notch 1 and switch ON both GF
switches.
11. TL6 Green LED and TL8 Green LED should glow on the digital
input card and corresponding yellow LEDs also should glow.
12. TL0 Green LED and yellow LED should be OFF on digital input
card.
13. Set the master handle to IDLE, RH to reverse direction and open
the notch to 1.
14. TL8 Green LED should go off and TL0 Green LED should glow.
15. Repeat the test on the other control stand.
DISPLAY TO DRIVER Yes

Ver2 Ver2A Ver3 Ver4

Applicable for
YES YES YES YES

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PARAMETER DESCRIPTION
FAULT CODE 1136
BKT Stuck in Motoring. Run Auto/Manual Tests.
FAULT MESSAGE
Electrical Control Problem
RESTRICTIONS Dynamic Brake Prohibited
ALARM BELL 5 seconds.
Low, Manual
RESET LEVEL After manual reset if the fault is still present, the fault is generated
again.
FAULT RECOVERY Automatic when BKT stuck is cleared

1. BKT not operating physically to braking side.

2. BKT not operating to braking side due to magnet valve defective.
PROBABLE CAUSES
3. BKT not operating to braking side due to no supply to magnet
valve.

1. Check and adjust control air pressure to 5Kgs./Sq.Cm.

2. Manually operate BKT magnet valves to change the BKT
position between braking and motoring.
3. BKT contacts should change their position freely with out any
obstruction. Ensure the status of the corresponding digital input
Green LEDs on the digital input card, which will toggles with
respect to BKT position.
4. If the BKT is not changing its position with manual operation of
magnet valves:
A. Check the Air hose connection to magnet valve. If air is
leaking or the pipe is blocked, change the air hose connec-
tion.
B. Press the armature plate of the magnet valve and check for
any Air leaking from the Air cylinder gasket / piston packing.
If air is leaking, change the gasket / piston packing.
C. Check free operation of Paul assembly by operating the BKT
with ‘L’ rod. If the BKT is not operating with normal force
change the pawl assembly.
5. If the BKT is operating manually, set the BKT in motoring position
by manually operating the magnet valve.
FAULT ISOLATION 6. Set the display mode to ‘Manual Test for Outputs’ under ‘Test
Mode’ menu.
A. Select BKT B CL press ‘Enter’ key to test the BKT braking
Magnet valve.
B. Press ‘1 /F2 ’ key to operate the BKT-B magnet valve.
7. If the BKT is not operating to braking side:
A. Check the voltage at the magnet valve coil terminals.
B. If voltage is more than 65 V, operating coil of the magnet
valve is defective. Replace the magnet valve.
C. If the voltage is zero, check the voltage at magnet valve coil
terminal (wire No. 51/13) with respective to locomotive 4
wire.
a) If the voltage is zero, check the continuity of 13/51-wire
loop connected to magnet valve. If necessary replace the
open circuited / wrong wiring.
b) If the voltage is more than 60 V, check the voltage at
magnet valve coil terminal (wire No. BKBCL) with respect
to locomotive 50 wire.
1) If the voltage is zero, then the digital output connector
at MEP is slack. Tighten the connector and check the
voltage again.

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PARAMETER DESCRIPTION
2) If voltage is still zero, check the continuity of BKBCL
wire from the magnet valve coil to digital output con-
nector of MEP. If necessary replace the cable and
check the voltage once again.
FAULT ISOLATION
3) If voltage is still zero, then the digital output card de-
fective. Replace the card.
8. Repeat the test again vide item No.6 and ensure BKT is throwing
to braking side
DISPLAY TO DRIVER Yes

Ver2 Ver2A Ver3 Ver4

Applicable for
YES YES YES YES

PARAMETER DESCRIPTION
FAULT CODE 1137
BKT-B Aux. Contact Circuit Open. Run Auto/Manual Tests. Electri-
FAULT MESSAGE
cal Control Problem.
RESTRICTIONS Dynamic Brake Prohibited
ALARM BELL 5 seconds.
Low, Manual
RESET LEVEL After manual reset if the fault is still present, the fault is generated
again.
FAULT RECOVERY Automatic when BKT-B Aux. Contact is closed.
1. Low control air pressure causing sluggish operations of BKT.
2. BKT partially moved and stopped.
PROBABLE CAUSES 3. BKT-B auxiliary contact is bad.
4. Defective wiring.
5. Digital input Connector at MEP is slack
1. Check and adjust control air pressure to 5Kgs./Sq.Cm.
2. Manually operate BKT magnet valves to change the BKT posi-
tion between braking and motoring.
3. BKT contact should change their position freely with out any
obstruction. Ensure the status of the corresponding digital input
Green LEDs on the digital input card, which will toggles with
respect to BKT position.
4. If the BKT is moving towards Braking position and stopping in
between:
A. Check the Air hose connection to magnet valve. If air is
leaking or the pipe is blocked, change the air hose connec-
tion.
B. Press the armature plate of the magnet valve and check for
FAULT ISOLATION any Air leaking from the Magnet valve / Air cylinder gasket /
piston packing. If air is leaking, change the magnet valve /
gasket / piston packing.
C. Check free operation of Paul assembly by operating the
BKT with ‘L’ rod. If the BKT is not operating with normal
force change the pawl assembly.
5. If the BKT is operating manually:
6. Check the BKT-B auxiliary contact for proper operation.
7. If the contact is properly closing in braking side and still the fault
is logged:
A. Set the display mode to ‘Manual Test for Inputs’ under Test
mode Menu.
B. Select BKT B CL and press ‘Enter’ key to test the status of
the BKT-B feedback.

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PARAMETER DESCRIPTION
C. Manually operate the BKT-B feedback auxiliary contact to
make and break the contact.
D. Observe the status of the Green LED on the Digital input
card and feed back position status on the display unit.
E. The Green LED and the status on the display unit should
toggle as per the auxiliary contact position. LED should
glow with contact closed and status on display unit should
be ON.
8. If Green LED and the status on display unit are not toggling as
per the contact position
A. Check the voltage at BKT-Auxiliary contact wire No. 51 with
respect to Locomotive 4 wire.
B. If the Voltage is zero, check the continuity of 51-wire loop
connecting to BKT-B auxiliary contact. Identify the open
FAULT ISOLATION
circuited wire/ wrong connection and rectify.
C. If the voltage is more than 65V, check the voltage at auxilia-
ry contact wire No. BKBFB with respect to locomotive 4
wire.
D. If the voltage is zero, then the contact is bad. Adjust / re-
place the auxiliary contact.
E. If the voltage is more than 65V:
a) The digital input connector might be slack at MEP control
unit.
b) Check the continuity of the wire BKBFB from BKT Auxilia-
ry contact to digital input connector at MEP. If necessary
replace the cable.
9. Check the BKT braking magnet valve operation once again and
ensure the BKT feed back signals are toggling correctly.
DISPLAY TO DRIVER Yes

Ver2 Ver2A Ver3 Ver4

Applicable for
YES YES YES YES

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PARAMETER DESCRIPTION
FAULT CODE 1138

FAULT MESSAGE Direction Change attempted at High Speed. Can’t Change Direction

RESTRICTIONS Motoring and Dynamic Brake Prohibited

ALARM BELL 5 seconds.
Low, Manual
RESET LEVEL After manual reset if the fault is still present, the fault is generated
again.
Automatic when loco speed reduces to 2 Kmph below the set speed
FAULT RECOVERY
for direction change.
Most probably this problem occurs while the loco is in shunting
service.
1. Loco pilot might have attempted to reverse the direction of
PROBABLE CAUSES
movement even though the loco speed is more than 5 Kmph.
2. 0/8 wires might be getting wrong feed through another loco in
MU.
1. Check the data pack for the fault logged.
2. Check the status of 0 and 8 wires supply and locomotive speed.
3. If no attempt of directional reverse is noticed, then
4. Crank the engine and set the loco for forward movement.
5. Check the status of TL8 & TL0 Green LEDs on the digital input
FAULT ISOLATION
card.
6. Only one green LED and corresponding yellow LED should glow
at one direction.
7. If both Green LEDs are glowing, wiring problem. Identify the
wrong feed and rectify.
DISPLAY TO DRIVER Yes

Ver2 Ver2A Ver3 Ver4

Applicable for
YES YES YES YES

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PARAMETER DESCRIPTION
FAULT CODE 1139
Invalid Combination of Notch Inputs.
FAULT MESSAGE
Engine running with Idle/Notch1 RPM
RESTRICTIONS Nil
ALARM BELL 5 seconds.
Low, Manual
RESET LEVEL After manual reset if the fault is still present, the fault is generated
again.
Automatic when valid combination of TL wires 15, 12, 7 and 3 are
FAULT RECOVERY
energized.
1. This message is logged when an invalid combination of train line
wires TL15, TL12, TL7 and TL3 are fed to MEP.
2. Wrong MU feeding
PROBABLE CAUSES
3. Defective master controller
4. Defective wiring between CS, TB and MU
5. Defective Digital input card.
1. Ensure there is no MU cable connected to another loco
2. Set both master controllers in IDLE position and ensure brake
system is working normal.
3. Check the status of TL15, TL12, TL7 and TL3 Green and Yellow
LEDs on the digital input card
A. If any of the above said Green LEDs is glowing, wrong feed
is coming to that particular Train line wire.
a) Check the voltage at the backside terminal board. Identify
from where the voltage is coming and rectify.
4. Set the display mode to ‘Manual Test for Inputs’ under ‘Test Mode’
menu.
5. Keep any of the master controller handle in steps from notch 1 to
8.
6. Observe the status of both Green and Yellow LEDs on the digital
input card.
7. The status of the LEDs should toggle as per the notch and
sequence given below.

Notch TL wire 15 TL wire 12 TL wire 7 TL wire 3

1
FAULT ISOLATION 2 *
3 *
4 * *
5 * * *
6 * * * *
7 * *
8 * * *

* Indicate LED should glow.

8. If any of the Green LEDs is not glowing as per the sequence, it
indicates that particular wire is not energized.
9. Change the master controller to another control stand and check
weather the same LED is not glowing in the same sequence.
10. If the Green LEDs are glowing normal as per the sequence, the
previous master controller is defective. Change the master
controller.
11. If the same Green LED is not glowing in sequence
A. Check the supply at the backside panel for particular train line
wire. Identify and rectify the wrong wiring.

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PARAMETER DESCRIPTION
B. Check the connector slackness of the digital input connector
at the MEP. If slack tighten.
C. Check the wire continuity from TB to digital input connector
at MEP. If necessary change the cable.
FAULT ISOLATION 12. If the Green LEDs are glowing and corresponding yellow LEDs
are not glowing, the LEDs are defective. Replace the card.
13. If both Green and yellow LEDs are glowing in correct sequence,
then the trouble might be with MU wiring/ Cable. Identify and
rectify.
DISPLAY TO DRIVER Yes

Ver2 Ver2A Ver3 Ver4

Applicable for
YES YES YES YES

PARAMETER DESCRIPTION
FAULT CODE 1140
FAULT MESSAGE Cranking Contactor Circuit Open. Engine may not Crank.
RESTRICTIONS None
ALARM BELL 5 seconds.
Low, Manual
RESET LEVEL
After manual reset if the fault still present, the fault is generated again.
FAULT RECOVERY Automatic when CK1/ CK2/ CK3 auxiliary contacts open.
1. Defective CKC contactor
2. Defective low side/ high side output card
3. Connector of low side output card is slack at MEP
PROBABLE CAUSES
4. Connector of high side output card is slack at MEP
5. Defective wiring
6. Defective cranking contactor
This message will be logged during cranking only.
1. Open the battery knife switch.
2. Manually operate and check free operation of CKC contactor and
all the three cranking contactors. Ensure there is no mechanical
obstruction to operate.
3. Ensure that both Green and Yellow LEDs of the CK1, CK2 & CK3
Contactors are glowing on the digital input card.
4. If all the three LEDs are glowing:
A. Manually open the Auxiliary contacts of CK1, CK2 and CK3.
B. Corresponding Green and Yellow LED should go off.
C. If corresponding LED is not going OFF,
a) Check the supply voltage on the corresponding feedback
FAULT ISOLATION wire (CK1FB/ CK2FB/ CK3FB) with respective to locomotive
4 wire.
b) If the supply voltage is more than 65 V, even though the
auxiliary contact is opened, then wiring mistake. Identify
from where the supply is feeding and rectify.
5. Close the battery knife switch and prepare the loco for cranking.
6. Pack the CK1, CK2, and CK3 contacts with an insulating sheet
so that auxiliary contacts open when they operate and no battery
supply is going to Aux. Machines.
7. Press start button.
8. CKC should pick up.
9. If CKC is not picking up.
A. Check the voltage at the operating coil of CKC.

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B. If the voltage is more than 65 Volts and still CKC is not picking
up, then CKC is defective. Replace the CKC.
C. If the voltage is zero, then check the voltage at wire No.
CKC_H/71 (High Side Output wire) and loco wire No. 4.
a) If the voltage is zero,
1) High side digital out put Connector might be slack at
control unit. Check and tighten. For V2 check the wire
continuity of wire 71 connected to CKC coil.
2) Check the continuity of wire CKC_H wire from CKC coil
to high side digital output connector. If necessary
replace the cable.
3) High side Digital out put card is defective. Replace and
check.
b) If voltage is more than 65 V, check the voltage between
wire No. 71 and CKC CL terminal at CKC. If the voltage is
zero,
1) Low side digital output connector might be slack at
control unit. Check and tighten.
2) Check the continuity of the wire CKC CL from the CKC
coil to Low side digital output connector. If necessary
replace the cable.
3) Low side Digital out put card is defective. Replace and
check again.
D. If the Voltage is more than 65 volts at wire 71, then check the
voltage between loco wire 13 and wire CKCCL at CKC coil.
E. If the voltage is zero,
a) Low side digital output connector is slack at MEP. Tighten
the connector.
b) Check the continuity of wire CKCCL from CKC coil to Low
side digital output connector of MEP. If necessary, replace
the cable.
c) The low side digital output connector is defective. Replace
the card and check up.
10. If CKC is picking up and none of the CK contactors picking up,
then the main contacts of the CKC are bad. Change the contactor
and check up.
11. If CKC is picking up and any one of the three CK contactors is
not picking up, then it is a wiring mistake. Identify and rectify.
DISPLAY TO DRIVER Yes

Ver2 Ver2A Ver3 Ver4

Applicable for
YES YES YES YES

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PARAMETER DESCRIPTION
FAULT CODE 1141
FAULT MESSAGE Aux. Gen. Output voltage high
RESTRICTIONS Battery charging prohibited
ALARM BELL 5 seconds.
Medium, Manual
RESET LEVEL After manual reset if the fault still present, the fault will be generated
again.
Automatic when Aux. Gen. Voltage is reduced.
FAULT RECOVERY Automatic fault reset is permitted for 3 times in an hour. After that
manual reset is required.
1. Defective Aux. Generator due to direct short circuit of field wire
with Armature.
PROBABLE CAUSES 2. Defective PWM card
3. Defective Aux. Gen. Voltage sensor.
4. Defective Analog input card
1. Check the wiring of the Auxiliary machines. Ensure there is no
short between LSS (A) and LAA terminals.
2. Set the display mode to ‘Auxiliary’ under display mode.
3. If Aux. Gen. Field current (AGFI) is high and APWM value is less,
then the PWM card might be defective. Replace the card and
check.
4. If AGFI is proportional to APWM value, measure voltage at LA
FAULT ISOLATION and LAA terminals of the Aux. Gen.
5. If the measured voltage is equal to 72 V and lower than the
displayed AGAV value, then the AGAV voltage sensor is defec-
tive. Replace the Voltage sensor and check again.
6. If all the values of AGFI, APWM, AGAV and battery charging is
with in the limits and still the fault is logged, Analog input card
might be defective.
7. Replace the cards and check once again.
DISPLAY TO DRIVER Yes

Ver2 Ver2A Ver3 Ver4

Applicable for
YES YES YES YES

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PARAMETER DESCRIPTION
FAULT CODE 1142
FAULT MESSAGE Battery Charging Current High
RESTRICTIONS Battery charging Prohibited
ALARM BELL 5 seconds.
Medium, Manual
RESET LEVEL After manual reset if the fault still present, the fault will be generated
again.
Automatic when battery-charging current is reduced.
FAULT RECOVERY Automatic fault reset is permitted for 3 times in an Hour. After that
manual reset is required.
Most probably this message will be logged soon after cranking.
PROBABLE CAUSES 1. Defective Batteries
2. Defective BATI
1. Check the individual cell voltage and specific gravity. Replace the
defective battery.
2. Check the battery charging current shown on the display and the
value shown on battery ammeter.
FAULT ISOLATION 3. If display is showing abnormally more value, then the battery
charging current sensor (BATI) is bad.
4. Replace the sensor and check once again.
5. If the message is followed by ‘Aux. Gen. Voltage High’ or ‘Aux.
Gen. Output Over Current’ faults then troubleshoot for these faults.
DISPLAY TO DRIVER Yes

Ver2 Ver2A Ver3 Ver4

Applicable for
YES YES YES YES

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PARAMETER DESCRIPTION
FAULT CODE 1143
FAULT MESSAGE Aux. Gen. Output Over current
RESTRICTIONS Battery charging Prohibited
ALARM BELL 5 seconds.
Medium, Manual
RESET LEVEL After manual reset if the fault still present, the fault will be generated
again.
Automatic when Aux. Gen. output current is reduced.
FAULT RECOVERY Automatic fault reset is permitted for 3 times in an Hour. After that
manual reset is required.
1. There may be a real high current due to short circuited load.
2. Defective Aux. Generator due to direct short of field wire with
Armature.
PROBABLE CAUSES
3. Defective AGAI current sensor
4. Defective Aux. Gen. Voltage sensor.
5. Defective Analog input card.
If the fault is logged soon after cranking, then it may due to deep
discharge. The message may be ignored.

1. Set the display mode to ‘Auxiliary’ under ‘Display’ menu option.

2. If (AGAV) Aux. Gen Voltage is high but the AGFI is zero or normal:
A. Defective Aux. Gen. with a field short-circuited internally with
the armature.
B. ‘Aux. Gen Voltage High’ message will be logged.
3. If Battery charging current is high but AGAV voltage is normal:
A. It may be due to defective battery set. Check individual
battery voltage and specific gravity value and level. Replace
the defective battery. However the ‘Battery charging current
FAULT ISOLATION High’ message will also be logged.
4. Measure and compare the Current flowing from Aux. Gen. with
a clamp on ammeter.
A. If both AGAI value on the display and clamp on ammeter are
same and high, then there is a real over load. Identify and
rectify.
B. If the AGAI value is comparatively higher than the clamp on
ammeter, then AGAI is defective. Replace the sensor and
check again.
C. If both AGAI value and clamp on ammeter value are same
and the values are with in the set limit of AGAI and still the
fault is logged then the Analog input card is defective.
Replace the card and check again.
DISPLAY TO DRIVER Yes

Ver2 Ver2A Ver3 Ver4

Applicable for
YES YES YES YES

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PARAMETER DESCRIPTION
FAULT CODE 1144
FAULT MESSAGE Aux. Gen. Field Over Current
RESTRICTIONS Battery charging Prohibited
ALARM BELL 5 seconds.
Medium, Manual
RESET LEVEL After manual reset if the fault still present, the fault will be generated
again.
Automatic when Aux. Gen. field current is reduced.
FAULT RECOVERY Automatic fault reset is permitted for 3 times in an Hour. After that,
manual reset is required.
1. External short circuit between AGC wire and 4 wire.
PROBABLE CAUSES 2. Defective PWM card.
3. Defective (AGAV) Aux. Gen. Voltage sensor.
1. Set the display mode to ‘Auxiliary’ under ‘Display Mode’ menu.
2. Switch OFF AGFB breaker and Crank the engine.
3. On the display APWM value should be zero.
4. If AGFI is abnormally high, remove PWM card
A. If AGFI is still showing high, there could be an external short
circuit bypassing PWM o/p (AGF) or the Aux. Gen. is
defective.
a) Check up the short-circuited wires and replace. If neces-
sary replace the Aux. Gen.
B. If AGFI is zero after removing PWM card, the PWM card is
defective. Replace and check up.
5. Switch ON AGFB. APWM and AGFI should rise slowly.
6. If the fault still logged, check the Aux. Gen. Voltage AGAV.
FAULT ISOLATION
7. If AGAV is zero, measure the Aux. Gen. Voltage with a voltmeter
at the Aux. Gen. terminals.
A. If the Voltage is zero, there is an open circuit in the machine.
A fault message ‘Auxiliary Generator Output Circuit Open ’
will also be logged. Check up with the machine.
8. If the voltage at Aux. Gen. Terminals is 72V, measure the voltage
at AGAV voltage sensor input terminals.
A. If the voltage is zero, the wiring from Ax. Gen. To AGAV
voltage sensor is defective. Identify the open circuited leads
and replace.
9. If the voltage at AGAV sensor terminals is 72V and AGAV is
showing zero, the AGAV sensor is defective.
A. Replace the AGAV sensor and check up.
DISPLAY TO DRIVER Yes

Ver2 Ver2A Ver3 Ver4

Applicable for
YES YES YES YES

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Chapter 4 - Medium Priority Faults Medha Servo Drives Pvt Ltd.

PARAMETER DESCRIPTION
FAULT CODE 1145
Aux. Gen. Output Circuit Open
FAULT MESSAGE No Battery Charging.
Warning: Battery Life Limited and Loco may Stall.
RESTRICTIONS Nil
ALARM BELL 5 seconds.
Low, Manual
RESET LEVEL After manual reset if the fault still present, the fault will be generated
again.
FAULT RECOVERY Automatic when Aux. Gen. Out put circuit is detected as closed.
1. Defective wiring (Open circuited at Aux. Gen. TB or back side
TB)
PROBABLE CAUSES
2. Defective Aux. Gen.
3. Defective AGAI current sensor.
1. Set the display mode to ‘Auxiliary’ under ‘Display Mode’ menu.
2. Crank the engine and switch ON AGFB.
3. If AGFI is more than zero and aux. Gen. voltage is 72 V and AGAI
is showing zero, then there is an external open circuit after the
Aux. Gen.
FAULT ISOLATION
A. Check up terminals at the back side TB for any burnt / fused
terminals of the Aux. Gen.
B. Identify and replace the defective wiring.
4. If BATI is showing and AGAI is showing less than BATI, then
AGAI current sensor is defective. Replace and check up
DISPLAY TO DRIVER Yes

Ver2 Ver2A Ver3 Ver4

Applicable for
YES YES YES YES

PARAMETER DESCRIPTION
FAULT CODE 1146
Aux. Gen. Field Circuit Open/ Short.
FAULT MESSAGE No Battery Charging.
Warning: Battery Life Limited. Loco may Stall.
RESTRICTIONS Nil
ALARM BELL 5 seconds
Low, Manual
RESET LEVEL After manual reset if the fault still present, the fault will be generated
again.
FAULT RECOVERY Automatic when Aux. Gen. field circuit is closed.
1. Defective wiring (Open circuited at Aux. Gen. TB or back
side TB.)
2. Defective AGFB
PROBABLE CAUSES
3. Bad interlocks of AGPR. (AGC-AGD, AGD-AGF)
4. Defective Aux. Gen. (Field is internally open circuited.)
5. Defective PWM card.
1. Set the display mode to ‘Auxiliary’ under ‘Display Mode’ menu.
3. Crank the engine and switch ON AGFB.
4. If Auxilliary PWM is more than 0 and AGFI is zero,
5. Check voltage between wire 49 (at AGFB) and locomotive 4-wire.
FAULT ISOLATION
A. If Voltage is zero, 49-wire loop coming to AGFB is open
circuited. Identify and replace.
6. If the voltage is more than 65V, check Voltage between wire-49B
at AGFB breaker and locomotive 4-wire.

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PARAMETER DESCRIPTION
A. If voltage is 0 with AGFB in ON position, then AGFB is
defective. Replace AGFB.
7. If the voltage between wire- 49B at AGFB and locomotive 4-wire
is more than 65 V, check the voltage between wire-49B at
backside TB and locomotive 4-wire.
A. If the voltage at backside TB (49B) is zero, wire-49B from
AGFB to back side TB is open circuited. Replace the wire.
8. If the voltage at 49B (back side TB) is more than 65 V, check the
voltage between wire LS at Aux. Gen. Terminal and locomotive
4-wire.
A. If Voltage is 0, Wire-49B from backside TB to Aux. Gen. is
open circuited. Replace the wiring.
9. If voltage at LS (Aux. Gen. TB) is more than 65V
A. Switch off AGFB and disconnect the wire AGF which is going
to MEP from the backside TB. Switch ON AGFB.
11. Check the voltage between wire-LSS at Aux. Gen. TB and
locomotive 4-wire.
A. If Voltage is 0, Aux. Gen. field open circuited internally. Check
and replace the Aux. Gen.
12. If Voltage at LSS (Aux. Gen. TB) is more than 65 V, Check the
voltage between wire LSS at AGFI current sensor and locomotive
4 wire.
A. If the Voltage is zero, wire LSS from Aux. Gen. TB to AGFI
FAULT ISOLATION
current sensor is open circuited.
13. If the Voltage at wire LSS (AGFI) is more than 65 V, check the
voltage between wire AGC at AGFI current sensor and locomotive
4-wire.
A. If the voltage is 0, AGFI current sensor is defective. Replace
the AGFI current sensor.
14. If voltage at AGC (AGFI) is more than 65 V, check the voltage
AGF backside TB and locomotive 4 wire.
A. If the voltage is zero,
a) Wire-AGC from AGFI to AGPR interlock is open circuited.
Check and replace.
b) AGPR interlocks bad. Replace the AGPR relay.
c) Wire-AGF from AGPR interlock and backside TB is open
circuited. Check and replace.
15. If voltage at wire AGF at the backside TB is more than 65 V,
A. Check the slackness of the PWM connecter at MEP. If slack
tighten.
B. Check the continuity of wire AGF from TB to PWM connecter.
If necessary replace the cable.
C. Switch off AGFB and reconnect the AGF wire to backside
TB. Switch ON AGFB.
16. If still AGFI is showing zero, PWM card might be defective.
Replace the card check up.
DISPLAY TO DRIVER Yes

Ver2 Ver2A Ver3 Ver4

Applicable for
YES YES YES YES

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Chapter 4 - Medium Priority Faults Medha Servo Drives Pvt Ltd.

PARAMETER DESCRIPTION
FAULT CODE 1148
FAULT MESSAGE Lube Oil Filter Jam
RESTRICTIONS None
ALARM BELL Nil
RESET LEVEL LOW, Manual
FAULT RECOVERY Automatic when the digital input is Low
System detected a jammed filter through digital input status of that
PROBABLE CAUSES
type of lube oil filter.
Replace the jammed filter.
Check the status of the corresponding digital input Green LED on
FAULT ISOLATION digital input card. If the LED is glowing, either the filter is jammed or
the input status of the digital input is high. Identify why the digital input
is high and rectify accordingly.
DISPLAY TO DRIVER Yes

Applicable for
YES NO NO NO

IM-203 rev 0 211

Chapter 4 - Medium Priority Faults Medha Servo Drives Pvt Ltd.

PARAMETER DESCRIPTION
FAULT CODE 1157
FAULT MESSAGE SLBR circuit open. Run Auto/ Manual Tests
RESTRICTIONS Can't Run Self Load Box Test
ALARM BELL 5 seconds
LOW, Manual
RESET LEVEL If the fault condition is still present when cleared manually, the fault
is generated again.
FAULT RECOVERY Automatic when SLBR auxiliary contact is closed
This message logs only after selecting self-load test through display
unit.
1. Defective SLBR relay (bad contact of feedback interlock).
2. Defective wiring.
PROBABLE CAUSES 3. Slackness of the corresponding digital output Connector at MEP.
4. Defective digital output card.
5. Slackness of the corresponding digital input connector at MEP
6. Control air pressure is low or zero and none of the SLBC
contactors picked up.
Crank the engine and ensure control air pressure is 5 Kg/ cm2. Select
self-load test option under Test menu option from display unit. Start
self load box test. Check the status of SLBR relay.

1. If SLBR relay is not picking up, check the supply at SLBR relay
coil terminals.
A. If the voltage is more than 65 V, and still the relay is not
picking up, then SLBR relay is defective. Replace the relay.
B. If the voltage is zero, check the voltage between wire 51/ 13
at coil terminal and wire 4 of locomotive.
a) If the voltage is zero, check the continuity of 51/ 13-wire
loop coming to SLBR relay. If necessary, replace the open
circuited/ wrong wiring.
b) If voltage is more than 65 V, check the voltage between
SLBR coil wire and wire 50 of locomotive.
1) If the voltage is zero, check slackness of digital output
connector at MEP. If the connector is slack, tighten the
same.
2) Check continuity of SLBR coil wire from SLBR coil
terminal to MEP digital output connector. If necessary,
FAULT ISOLATION
replace the cable.
3) If continuity of wire SLBR coil is OK and still the voltage
is zero, digital output card might be defective. Replace
the digital output card.
2. If SLBR relay is picked up, check the status of the SLBC
contactors. If none of the SLBC contactors are picked up, check
the supply across any magnet valve of SLBC contactor.
A. If the voltage is more than 65 V and control air pressure is
less than 5 kg/ cm2, adjust the control air pressure to
5 kg/ cm².
B. Check up voltage across other magnet valve coils of SLBC
contactors.
C. If voltage is zero, check the voltage between wire 51SLB
and wire 4 of locomotive.
a. If voltage is zero, SLBR interlock is bad or supply to 51
is missing. Identify wrong wiring or replace SLBR relay,
if necessary.
3. If SLBR is in picked up condition and any of the SLBC contactor
is not picked up, concerned SLBR interlock is bad or 51SLB wire
loop is missing. Identify and rectify.

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PARAMETER DESCRIPTION
4. If the SLBR relay and all SLBC contactors are picking up, then
check the voltage between wire 51 at SLBC interlocks and wire
4 of locomotive.
A. If voltage is zero, 51/ 13-wire loop is defective. Identify and
replace the wrong wiring.
FAULT ISOLATION B. If voltage is more than 65 volts, check the following:
a. Check the slackness of digital input connector at MEP, if
slack tighten the connector.
b. Check the continuity of wire SLBC feedback from SLBC
aux. Interlock to digital input connector. If no continuity,
replace the cable.
DISPLAY TO DRIVER Yes

Ver2 Ver2A Ver3 Ver4

Applicable for
YES YES YES YES

IM-203 rev 0 213

Chapter 4 - Medium Priority Faults Medha Servo Drives Pvt Ltd.

PARAMETER DESCRIPTION
FAULT CODE 1158
AEB Applied Brake
FAULT MESSAGE Move master controller Handle to IDLE
And Press AEB Reset to release Brake
Motoring not permitted till the master handle is brought to IDLE and
RESTRICTIONS
loco speed is dropped below 10 Kmph (configurable set limit)
ALARM BELL 5 seconds
LOW, Manual
RESET LEVEL If the fault condition is still present when cleared manually, the fault
is generated again.
Automatic when the loco speed is dropped below 10 kmph
FAULT RECOVERY
(configurable set limit) and master handle is brought to IDLE.
Generally it is not a fault in the locomotive performance. This is a
warning message to loco pilot that penalty brakes are applied due
to Loco speed is increased beyond the set limit and ‘Auto Emergen-
PROBABLE CAUSES cy Brake system’ feature is enabled.

When this feature is enabled, loco pilot should control the loco
speed within the set limit, otherwise system initiates penalty brakes.
Bring the master handle to IDLE.
Wait till loco speed is dropped below 10 kmph (configuration set
FAULT ISOLATION
limit) and
Press AEB reset push button to release penalty brakes.
DISPLAY TO DRIVER Yes

Ver2 Ver2A Ver3 Ver4

Applicable for
YES YES YES YES

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Medha Servo Drives Pvt Ltd. MEP Troubleshooting Manual

PARAMETER DESCRIPTION
FAULT CODE 1159
FAULT MESSAGE Engine Speed Sensor1 faulty
RESTRICTIONS None
ALARM BELL 5 seconds
LOW, Manual
RESET LEVEL If the fault condition is still present when cleared manually, the fault
is generated again.
Automatic when the engine RPM signal is sensed normally from
FAULT RECOVERY
Engine Speed Sensor 1
1. Engine Speed Sensor 1 faulty.
2. Defective (MSI761) Speed sensor interface unit.
PROBABLE CAUSES 3. Defective cables.
4. Defective (RDB/ FDB) RPM distribution unit.
5. Defective Frequency input card.
1. Shut down the engine and reset the fault manually.
2. Check the welding condition of the ESS weld nut on the cam gear
cover. If weld nut is slack or welding crack, remove the cam gear
and attend the welding.
3. Check for any slackness in the ESS fitment. If so, remove the
ESS and adjust the gap as per the Instruction manual of Doc No:
IM 46
4. Switch OFF MPCB breaker and remove ESS1 cable connector
at MSI761 unit / RDB (Version 1.0 locos). Check the continuity
of wires in the ESS1 cable and ensure no short between pin-to-pin
and pin to ground.
5. After ensuring cable continuity and no ground fault, reconnect
the cable at Speed sensor interface unit/ RPM distribution Unit .
6. Switch ON MPCB breaker and measure voltage between pin B
& C of the ESS cable connector. The voltage should be +12 V
with pin C positive.
FAULT ISOLATION A. If the voltage is zero/ less:
a) MSI761 unit/ RDB is defective. Replace MSI761 unit/
RDB.
B. If voltage is +12 V, reconnect the cable connector to ESS.
Ensure tightness of connectors at both the ends of ESS and
MSI761 unit/ RDB.
7. Crank the engine, check the engine RPM signal on the display
unit.
A. Raise the notch and ensure notch wise engine RPM is
showing correct reading on the display.
B. If engine RPM on display is erratic/ fluctuating/ no RPM,
replace the ESS1. Adjust the air gap as per the above-
referred Maintenance Instruction manual (IM 46).
8. Repeat point 7 and check the Engine RPM on Display unit.
A. If engine Rpm on display is erratic/ fluctuating/ no RPM,
frequency input card might be defective. Replace the card
and repeat point 7.
DISPLAY TO DRIVER Yes

Ver2 Ver2A Ver3 Ver4

Applicable for
YES YES YES YES

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Chapter 4 - Medium Priority Faults Medha Servo Drives Pvt Ltd.

PARAMETER DESCRIPTION
FAULT CODE 1160
FAULT MESSAGE Engine Speed Sensor 2 faulty
RESTRICTIONS None
ALARM BELL 5 seconds
LOW, Manual
RESET LEVEL If the fault condition is still present when cleared manually, the fault
is generated again.
Automatic when the engine RPM signal is sensed normally from
FAULT RECOVERY
Engine Speed Sensor 2.
1. Engine Speed Sensor 2 faulty.
2. Defective (MSI761) Speed sensor interface unit.
PROBABLE CAUSES 3. Defective cables.
4. Defective (RDB/ FDB) RPM distribution Unit .
5. Defective frequency input card.
1. Shut down the engine and reset the fault manually.
2. Check the welding condition of the ESS2 weld nut on the
camgear cover. If weld nut is slack or welding crack, remove
the cam gear cover and attend the welding.
3. Check for any slackness in the ESS2 fitting. If so, remove the
ESS2 and adjust the gap as per the Instruction manual No:
IM 46.
4. Switch OFF MPCB breaker and remove ESS2 cable connector
at MSI761 unit/ RDB (version 1.0 locos). Check the continuity
of wires in the ESS2 cable and ensure no short between
pin-to-pin and pin to ground.
5. After ensuring cable continuity and no ground fault, reconnect
the cable at MSI761 unit/ RDB.
6. Switch ON MPCB breaker and measure voltage between pin
B & C of the ESS2 cable connector at ESS2 end. The voltage
should be +12 V with pin C positive.
FAULT ISOLATION A. If the voltage is zero/ less,
a) SSI unit/ RDB is defective. Replace the MSI761 unit/
RDB.
B. If voltage is +12 V, reconnect the cable connector to ESS2.
Ensure tightness of connectors at both the ends of ESS2
and MSI761 unit/ RDB.
7. Crank the engine, check the engine RPM signal on the display
unit.
A. Raise the notch and ensure notch wise engine RPM is
showing correctly on the Display.
B. If engine RPM on display is erratic/ fluctuating/ no RPM,
replace ESS2. Adjust the air gap as per the above referred
Maintenance Instructions manual.
8. Repeat point 7 and check the Engine RPM on display unit.
A. If engine RPM on display is erratic/ fluctuating/ no RPM,
frequency input card might be defective. Replace the card
and repeat point 7.
DISPLAY TO DRIVER Yes

Ver2 Ver2A Ver3 Ver4

Applicable for
YES YES YES YES

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PARAMETER DESCRIPTION
FAULT CODE 1163
FAULT MESSAGE PCS is bypassed
RESTRICTIONS Nil
ALARM BELL 5 seconds
Medium, Manual
RESET LEVEL Manual fault clearing through keyboard on the display unit not
available.
FAULT RECOVERY Automatic when BPP is found normal.
1. Defective/ blocked pressure pipe lines
2. Brake Pipe Pressure sensor (BPP) faulty.
3. Defective cables
PROBABLE CAUSES
4. Defective ADB
5. Defective Analogue input card.
6. PCS input is normal
1. Set the display to show mixed parameters by selecting Display
mode from the main menu and then selecting 'Mixed' sub-menu.
2. Check the Brake pipe pressure displayed in the display unit with
the calibrated Pneumatic gauge.
3. If the difference is excess, replace the sensor and check up.
4. If the difference is negligible, but still the fault is logging,
A. Check slackness of the connectors either at the sensor
or at ADB. Tighten the connectors at both the ends of
sensor and ADB cable.
FAULT ISOLATION
B. Defective interconnecting cable between sensor and
ADB. Replace the cable and check up.
C. Slackness of the connectors either at ADB or MEP
control unit. Tighten the cable connectors at ADB and
MEP control unit.
D. Defective interconnecting cable between ADB and MEP
control unit.
E. Defective ADB. Replace ADB and check.
F. Defective analog input card. Replace the card check up
DISPLAY TO DRIVER Yes

Ver2 Ver2A Ver3 Ver4

Applicable for
NO YES YES YES

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Chapter 4 - Medium Priority Faults Medha Servo Drives Pvt Ltd.

PARAMETER DESCRIPTION
FAULT CODE 1164
Shorted Rectifier Diode Fault Or Single Phase Main Generator
FAULT MESSAGE
Faulty
Motoring Prohibited, Dynamic Brake Prohibited, Self load Box
RESTRICTIONS
Prohibited.
ALARM BELL 5 seconds
RESET LEVEL Medium
Manual fault clearing through keyboard on the display unit. If the
FAULT RECOVERY fault condition is still present when cleared manually, then fault will
be generated again.
1. One of the main alternator phase out put voltage is zero or low
PROBABLE CAUSES compared to other phase voltages.
2. Disconnected phase wires at the sensing unit or at alternator.

This fault will be logged only on locomotives, equipped with GE

alternators and rectifier unit.
1. Set the loco to measure no load voltage.
2. Advance the throttle to notch 1 with both the GF switches closed.
3. Measure all the phase voltages at the alternator output. If any
phase voltage is zero or less as compared to other phase
voltages, troubleshoot as per the alternator maintenance
manual.
FAULT ISOLATION
4. If all the phase voltages are same, measure the voltages at the
single phase measuring unit. If any phase voltage is not
available, check the wiring for any open circuited wires.
5. If all the phase voltages are available at the sensing unit but
still the fault is repeating, replace the single phase preventor
unit.
A. Check for any wrong supply to the digital input SPP FB.
Identify wrong connection and rectify.

DISPLAY TO DRIVER Yes

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PARAMETER DESCRIPTION
4. Check the continuity of ADB health input from TB to the ADB
power supply Cable connector. If necessary, replace the cable.
5. Check the digital input status (ADB4 health input) on the
FAULT ISOLATION corresponding digital input card.
6. If the green LED glowing and corresponding Yellow LED is not
glowing then the digital input card then Digital input card is
defective. Replace and check up.
DISPLAY TO DRIVER No

Ver2 Ver2A Ver3 Ver4

Applicable for
NO YES YES YES

PARAMETER DESCRIPTION
FAULT CODE 1188
Ground Relay Cutout Switch1 Open Fault.
FAULT MESSAGE
Warning : Ground leakage current could not be detected.

RESTRICTIONS Nil

ALARM BELL Nil

Low, Manual.
RESET LEVEL If the fault condition is still present when cleared manually, the fault
is generated again
Automatic when Ground Relay Cutout Switch1 closed as
FAULT RECOVERY
sensed through corresponding digital input (GRCO1FB).
1. GRCO1 switch is open by operator/ crew.
PROBABLE CAUSES 2. Disconnected/ broken wire GRCO1FB at the switch
3. GRCO1 feedback input connector is slack at MEP control unit
1. If the GRCO1 switch is in open, close the switch.
2. If the Switch is in closed condition and the feedback input LED on
the Digital input card is not glowing.
A. Check for any disconnected broken wires at the GRCO1
FAULT ISOLATION
switch. Identify and connect the wires.
B. Check the continuity of GRCO1 Feedback wire from the switch
to digital input connector.If necessary, replace the cable.
C. Check the tightness of the connector.
DISPLAY TO DRIVER Yes

Ver2 Ver2A Ver3 Ver4

Applicable for
NO YES YES YES

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Chapter 5 - Low Priority Faults Medha Servo Drives Pvt Ltd.

PARAMETER DESCRIPTION
FAULT CODE 1189
FAULT MESSAGE Traction motor 1 current sensor faulty
RESTRICTIONS Dynamic braking prohibited
ALARM BELL Nil
Medium, Manual
RESET LEVEL If the fault condition is still present when cleared manually, the fault
is generated again.
FAULT RECOVERY Automatic when the Tr.Motor current sensor detected working normal.
1. Defective cables
2. TM1AI sensor faulty.
PROBABLE CAUSES
3. Defective EP ADB/ ADB3
4. Defective Analog input card.
1. Remove the cable connector at the sensor.
2. Measure the voltage between pin A & B of the cable connector.
The voltage should be 24V with pin A positive. (+24V)
3. Measure the voltage between pin B & C of the cable connector.
The voltage should be 24V with pin B positive. (-24V)
4. If any of the above voltages (+24V) or (-24V) is zero/ less:
A. Remove the traction motor 1 current sensor cable connector
on ADB.
B. Measure the voltages between pins A, B and C of the ADB
a) If voltage between A & B is less than +24V or voltage
between C & B is less than -24V, ADB is defective. Replace
the ADB.
FAULT ISOLATION
b) If the voltages between pins A & B is +24V and voltage
between pins C & B is -24V, the interconnecting cable
between ADB and traction motor 1 current sensor is
defective.
5. If +24V and -24V supply is available at the sensor cable connector,
A. Sensor may be defective. Replace and check.
B. The 19 pin connector between ADB and MEP control unit may
be slack. Check and tighten the connectors.
C. The interconnecting cable between ADB and MEP control unit
may be defective. Replace the cable and check up.
D. Corresponding Analog input card might be defective.
Replace the card and check up.
DISPLAY TO DRIVER Yes

Ver2 Ver2A Ver3 Ver4

Applicable for
YES YES YES YES

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PARAMETER DESCRIPTION
FAULT CODE 1190
FAULT MESSAGE Traction motor 2 current sensor faulty
RESTRICTIONS Dynamic braking prohibited.
ALARM BELL Nil
Medium, Manual
RESET LEVEL If the fault condition is still present when cleared manually, the fault
is generated again.
FAULT RECOVERY Automatic when the Tr.Motor current sensor detected working normal.
1. Defective cables
2. TM2AI sensor faulty.
PROBABLE CAUSES
3. Defective EPADB/ ADB3
4. Defective Analog input card.
1. Remove the cable connector at the sensor.
2. Measure the voltage between pin A & B of the cable connector.
The voltage should be +24V with pin A positive.
3. Measure the voltage between pin C & B of the cable connector.
The voltage should be -24V with pin C positive.
4. If any of the above voltages (+24V) or (-24V) is zero / less:
A. Remove the traction motor 2 current sensor cable connector
on ADB.
B. Measure the voltages between pins A, B and C of the ADB.
a) If voltage between A & B is less than +24 V or voltage
between C & B is less than -24V, ADB is defective. Replace
the ADB.
FAULT ISOLATION
b) If the voltages between pins B & A is +24V and voltage
between pins C & B is -24V, the interconnecting cable
between ADB and traction motor 2 current sensor is
defective.
5. If +24V and -24V supply is available at the sensor cable connector,
A. Sensor may be defective. Replace and check.
B. The 19 pin connector between ADB and MEP control unit may
be slack. Check and tighten the connectors.
C. The interconnecting cable between ADB and MEP control unit
may be defective. Replace the cable and check up.
D. Corresponding analog input card might be defective. Replace
the card and check up.
DISPLAY TO DRIVER Yes

Ver2 Ver2A Ver3 Ver4

Applicable for
YES YES YES YES

IM-203 rev 0 235

Chapter 5 - Low Priority Faults Medha Servo Drives Pvt Ltd.

PARAMETER DESCRIPTION
FAULT CODE 1191
FAULT MESSAGE Traction motor 3 current sensor faulty
RESTRICTIONS Dynamic braking prohibited.
ALARM BELL Nil
Medium, Manual
RESET LEVEL If the fault condition is still present when cleared manually, the fault
is generated again.
FAULT RECOVERY Automatic when the Tr. Motor current sensor detected working normal.
1. Defective cables
2. TM3AI sensor faulty.
PROBABLE CAUSES
3. Defective EP ADB/ ADB3
4. Defective Analog input card.
1. Remove the cable connector at the sensor.
2. Measure the voltage between pin A & B of the cable connector.
The voltage should be +24V with pin A positive.
3. Measure the voltage between pin C & B of the cable connector.
The voltage should be -24V with pin C positive.
4. If any of the above voltages (+24V) or (-24V) is zero / less:
A. Remove the traction motor 3 current sensor cable connector
on ADB.
B. Measure the voltages between pins A, B and C of the ADB.
a) If voltage between A & B is less than +24V or voltage
between C & B is less than -24V, ADB is defective. Replace
the ADB.
FAULT ISOLATION
b) If the voltages between pins A & B is +24V and voltage
between pins C & B is -24V, the interconnecting cable
between ADB and traction motor 3 current sensor is
defective.
5. If +24V and -24V supply is available at the sensor cable connector,
A. Sensor may be defective. Replace and check.
B. The 19 pin connector between ADB and MEP control unit may
be slack. Check and tighten the connectors.
C. The interconnecting cable between ADB and MEP control unit
may be defective. Replace the cable and check up.
D. Corresponding Analog input card might be defective.
Replace the card and check up.
DISPLAY TO DRIVER Yes

Ver2 Ver2A Ver3 Ver4

Applicable for
YES YES YES YES

236 IM-203 rev 0

Medha Servo Drives Pvt Ltd. MEP Troubleshooting Manual

PARAMETER DESCRIPTION
FAULT CODE 1192
FAULT MESSAGE Traction motor 4 current sensor faulty
RESTRICTIONS Dynamic braking prohibited.
ALARM BELL Nil
Medium, Manual
RESET LEVEL If the fault condition is still present when cleared manually, the fault
is generated again.
FAULT RECOVERY Automatic when the Tr. Motor current sensor detected working normal.
1. Defective cables
2. TM4AI sensor faulty.
PROBABLE CAUSES
3. Defective EP ADB/ ADB3
4. Defective Analog input card

1. Remove the cable connector at the sensor.

2. Measure the voltage between pin A & B of the cable connector.
The voltage should be +24V with pin A positive.
3. Measure the voltage between pin C & B of the cable connector.
The voltage should be -24V with pin C positive.
4. If any of the above voltages (+24V) or (-24V) is zero / less:
A. Remove the traction motor 4 current sensor cable connector
on ADB.
B. Measure the voltages between pins A, B and C of the ADB.
a) If voltage between A & B is less than +24V or voltage
between C & B is less than -24V, ADB is defective. Replace
the ADB.
FAULT ISOLATION
b) If the voltages between pins A & B is +24V and voltage
between pins C & B is -24V, the interconnecting cable
between ADB and traction motor 4 current sensor is
defective.
5. If +24V and -24V supply is available at the sensor cable connector,
A. Sensor may be defective. Replace and check.
B. The 19 pin connector between ADB and MEP control unit may
be slack. Check and tighten the connectors.
C. The interconnecting cable between ADB and MEP control unit
may be defective. Replace the cable and check up.
D. Corresponding analog input card might be defective. Replace
the card and check up.

DISPLAY TO DRIVER Yes

Ver2 Ver2A Ver3 Ver4

Applicable for
YES YES YES YES

IM-203 rev 0 237

Chapter 5 - Low Priority Faults Medha Servo Drives Pvt Ltd.

PARAMETER DESCRIPTION
FAULT CODE 1193
FAULT MESSAGE Traction motor 5 current sensor faulty
RESTRICTIONS Dynamic braking prohibited.
ALARM BELL Nil
Medium, Manual
RESET LEVEL If the fault condition is still present when cleared manually, the fault
is generated again.
FAULT RECOVERY Automatic when the Tr.Motor current sensor detected working normal.
1. Defective cables
2. TM5AI sensor faulty.
PROBABLE CAUSES
3. Defective EP/ ADB3
4. Defective Analog input card
1. Remove the cable connector at the sensor.
2. Measure the voltage between pin A & B of the cable connector.
The voltage should be +24V with pin A positive.
3. Measure the voltage between pin C & B of the cable connector.
The voltage should be -24V with pin C positive.
4. If any of the above voltages (+24V) or (-24V) is zero / less:
A. Remove the traction motor 5 current sensor cable connector
on ADB
B. Measure the voltages between pins A, B and C of the ADB .
a) If voltage between A & C is less than +24V or voltage
between C & A is less than -24V, ADB is defective. Replace
the ADB.
FAULT ISOLATION
b) If the voltages between pins A & B is +24V and voltage
between pins C & B is -24V, the interconnecting cable
between ADB and traction motor 5 current sensor is
defective.
5. If +24V and -24V supply is available at the sensor cable connector,
A. Sensor may be defective. Replace and check.
B. The 19 pin connector between ADB and MEP control unit may
be slack. Check and tighten the connectors.
C. The interconnecting cable between ADB and MEP Control unit
may be defective. Replace the cable and check up.
D. Corresponding analog input card might be defective. Replace
the card and check up.
DISPLAY TO DRIVER Yes

Ver2 Ver2A Ver3 Ver4

Applicable for
YES YES YES YES

238 IM-203 rev 0

Medha Servo Drives Pvt Ltd. MEP Troubleshooting Manual

PARAMETER DESCRIPTION
FAULT CODE 1194
FAULT MESSAGE Traction motor 6 current sensor faulty
RESTRICTIONS Dynamic braking prohibited.
ALARM BELL Nil
Medium, Manual
RESET LEVEL If the fault condition is still present when cleared manually, the fault
is generated again.
FAULT RECOVERY Automatic when the Tr.Motor current sensor detected working normal.
1. Defective cables
2. TM6AI sensor faulty.
PROBABLE CAUSES
3. Defective EP ADB/ ADB3
4. Defective Analog input card
1. Remove the cable connector at the sensor.
2. Measure the voltage between pin A & B of the cable connector.
The voltage should be +24V with pin A positive.
3. Measure the voltage between pin C & B of the cable connector.
The voltage should be -24V with pin C positive.
4. If any of the above voltages (+24V) or (-24V) is zero / less:
A. Remove the traction motor 6 current sensor cable connector
on ADB
B. Measure the voltages between pins A, B and C of the ADB.
a) If voltage between A & B is less than +24V or voltage
between C & B is less than -24V, ADB is defective. Replace
the ADB
FAULT ISOLATION
b) If the voltages between pins A & B is +24V and voltage
between pins C & B is -24V, the interconnecting cable
between ADB and traction motor 6 current sensor is
defective.
5. If +24V and -24V supply is available at the sensor cable connector,
A. Sensor may be defective. Replace and check.
B. The 19 pin connector between ADB and MEP control unit may
be slack. Check and tighten the connectors.
C. The interconnecting cable between ADB and MEP Control unit
may be defective. Replace the cable and check up.
D. Corresponding analog input card might be defective. Replace
the card and check up.
DISPLAY TO DRIVER Yes

Ver2 Ver2A Ver3 Ver4

Applicable for
YES YES YES YES

IM-203 rev 0 239

Chapter 5 - Low Priority Faults Medha Servo Drives Pvt Ltd.

PARAMETER DESCRIPTION
FAULT CODE 1195
FAULT MESSAGE S1 Auxiliary Contact circuit open. Run Auto/ Manual Tests
RESTRICTIONS Dynamic braking prohibited.
ALARM BELL Nil
Low, Manual
RESET LEVEL If the fault condition is still present when cleared manually, the fault
is generated again.
FAULT RECOVERY Automatic when the S1 power contactor Aux. Contact closes.
1. Defective Power contactor
PROBABLE CAUSES 2. Defective wiring.
3. Defective digital output card.
Set the display mode to 'Manual Test for outputs' under 'Test Mode'
available in main menu. The display exhibits certain conditions to be
fulfilled. After that press 'Enter' key to start testing of outputs. Ensure
control air pressure is 5 kg/ cm2

Select 'S1 CL' and then press Enter key to test S1 power contactor.
Press 'F1/ 1' to energize the contactor and 'F2/0' to de-energize
the contactor.

1. Press 'F1/ 1' to energize the S1 power contactor. If the contactor

is not picking up, check the voltage across the operating coil of the
magnet valve.
A) If the voltage is zero, check the voltage between wire
51/13 at the coil terminal and locomotive 4 wire.
a) If the voltage is zero, check the continuity of
51/13 wire connected to the coil terminal.
b) If the voltage is more than 65V, check the voltage
between locomotive 51/ 13 wire and S1CL wire at
the coil terminal.
▪ If the voltage is zero, negative path is not getting
through MEP.
• Check the slackness of the Digital output cable connector
FAULT ISOLATION at MEP control unit. If found slack, tighten the connector.
• Check the continuity of wire marker S1CL from S1 coil
terminal to Digital output connector . If necessary, replace
the cable.
• If still voltage is zero, the digital output card might be
defective. Replace the card and check once again.
B) If the voltage is more than 65V and still power contactor
is not picking up, then the power contactor or magnet
valve or pneumatic circuit is defective. Identify and
replace the component/contactor.

2. Press 'F2/ 0' to de-energize the power contactor. While toggling

the power contactor, check the input status (S1 FB healthy
status) on the digital input card .With power contactor being
energized, both LEDs should glow on the digital input card.
• If the Green LED is not glowing on digital input card, check
the voltage between wire 51 at the power contactor Aux.
Interlock and locomotive 4 wire.
a) If the voltage is zero, check the continuity of the wire
Loop 51 connected to S1 power contactor interlock.
Identify faulty wiring and rectify.
b) If the voltage is more than 65V, check the voltage
between S1FB and locomotive 4 wire.

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Medha Servo Drives Pvt Ltd. MEP Troubleshooting Manual

PARAMETER DESCRIPTION
▪ If the voltage is zero, the interlock is faulty. Replace
the interlock/ aux. Contact.
▪ If the voltage is more than 65V,
• Check the slackness of the digital input connector at MEP
control unit. If the connector is slack, tighten the connector
• Check the continuity of the wire S1FB from the digital input
connector to S1 contactor . If necessary, replace the cable.
3. If the Green LED is glowing and corresponding yellow LED is not
glowing on the digital input card, then digital input card is defective.
Replace the digital input card.
DISPLAY TO DRIVER Yes

Ver2 Ver2A Ver3 Ver4

Applicable for
YES YES YES YES

PARAMETER DESCRIPTION
FAULT CODE 1196
FAULT MESSAGE S21 Auxiliary Contact circuit open. Run Auto/ Manual Tests
RESTRICTIONS None
ALARM BELL Nil
Low, Manual
RESET LEVEL If the fault condition is still present when cleared manually, the fault
is generated again.
FAULT RECOVERY Automatic when the S21 power contactor Aux. Contact closes.
1. Defective Power contactor
PROBABLE CAUSES 2. Defective wiring.
3. Defective digital output card.
Set the display mode to 'Manual Test for outputs' under 'Test Mode'
available in main menu. The display exhibits certain conditions to be
fulfilled. After that press 'Enter' key to start testing of outputs. Ensure
control air pressure is 5 kg/ cm2 .
Select 'S21 CL'and then press Enter key to test S21power contactor.
Press 'F1/ 1' to energize the contactor and 'F2/ 0' to de-energize
the contactor.
1. Press 'F1/ 1' to energize the S21 power contactor. If the contactor
is not picking up, check the voltage across the operating coil of
the magnet valve.
A) If the voltage is zero, check the voltage between wire
FAULT ISOLATION 51/13 at the coil terminal and locomotive 4 wire.
a) If the voltage is zero, check the continuity of
51/13 wire connected to the coil terminal.
b) If the voltage is more than 65V, check the voltage
between locomotive 51/13 wire and S21CL wire at
the coil terminal.
▪ If the voltage is zero, negative path is not get-
ting through MEP.
• Check the slackness of the Digital output cable con-
nector at MEP control unit. If found slack, tighten the
connector.

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Chapter 5 - Low Priority Faults Medha Servo Drives Pvt Ltd.

• Check the continuity of wire marker S21CL from S21 coil

terminal to Digital output connector . If necessary, replace
the cable.
• If still voltage is zero, the digital output card might be
defective. Replace the card and check once again.
B) If the voltage is more than 65V and still power contactor
is not picking up, then the power contactor or magnet
valve or pneumatic circuit is defective. Identify and
replace the component/contactor.

2. Press 'F2/0' to de-energize the power contactor. While toggling

the power contactor, check the input status (S21 FB healthy
status) on the digital input card . With power contactor being
energized, both the LEDs should glow on the digital input card.
• If the Green LED is not glowing on digital input card, check
the voltage between wire 51 at the power contactor Aux.
Interlock and locomotive 4 wire.
a) If the voltage is zero, check the continuity of the wire
Loop 51 connected to S21 power contactor interlock.
Identify faulty wiring and rectify.
b) If the voltage is more than 65V, check the voltage
between S21FB and locomotive 4 wire.
▪ If the voltage is zero, the interlock is faulty.
Replace the interlock/aux. Contact.
▪ If the voltage is more than 65V,
• Check the slackness of the digital input connector at MEP
control unit. If the connector is slack, tighten the connector.
• Check the continuity of the wire S21FB from the digital input
connector to S21 contactor. If necessary, replace the cable.
3. If the Green LED is glowing and corresponding yellow LED is not
glowing on the digital input card, then digital input card is
defective. Replace the digital input card
DISPLAY TO DRIVER No

Ver2 Ver2A Ver3 Ver4

Applicable for
YES YES YES YES

242 IM-203 rev 0

Medha Servo Drives Pvt Ltd. MEP Troubleshooting Manual

PARAMETER DESCRIPTION
FAULT CODE 1197
FAULT MESSAGE S31 Auxiliary Contact circuit open. Run Auto/Manual Tests
RESTRICTIONS None
ALARM BELL Nil
Low, Manual
RESET LEVEL If the fault condition is still present when cleared manually, the fault
is generated again.
FAULT RECOVERY Automatic when the S31 power contactor Aux. Contact closes
1. Defective Power contactor.
PROBABLE CAUSES 2. Defective wiring.
3. Defective digital output card.
Set the display mode to 'Manual Test for outputs' under 'Test Mode'
available in main menu. The display exhibits certain conditions to
be fulfilled. After that press 'Enter' key to start testing of outputs.
Ensure control air pressure is 5 kg/cm2 .

Select 'S31 CL' and then press Enter key to test S31 power contac-
tor. Press 'F1/1' to energize the contactor and 'F2/0' to de-energize
the contactor.

1. Press 'F1/1' to energize the S31 power contactor. If the contac-

tor is not picking up, check the voltage across the operating coil
of the magnet valve.
A) If the voltage is zero, check the voltage between wire
51/13 at the coil terminal and locomotive 4 wire.
a) If the voltage is zero, check the continuity of
51/13 wire connected to the coil terminal.
b) If the voltage is more than 65V, check the voltage
between locomotive 51/13 wire and S31CL wire at
the coil terminal.
▪ If the voltage is zero, negative path is not getting
through MEP.
• Check the slackness of the Digital output cable
connector at MEP control unit. If found slack,
FAULT ISOLATION tighten the connector.
• Check the continuity of wire marker S31CL from
S31 coil terminal to digital output connector. If
necessary, replace the cable.
• If still voltage is zero, the digital output card
might be defective. Replace the card and check
once again.
B) If the voltage is more than 65V and still power contactor
is not picking up, then the power contactor or magnet
valve or pneumatic circuit is defective. Identify and re-
place the component/contactor.

2. Press 'F2/0' to de-energize the power contactor. While toggling

the power contactor, check the input status (S31 FB healthy sta-
tus) on the digital input card . With power contactor being ener-
gized, both the LEDs should glow on the digital input card.
• If the Green LED is not glowing on digital input card, check
the voltage between wire 51 at the power contactor Aux.
Interlock and locomotive 4 wire.
a) If the voltage is zero, check the continuity of the wire
Loop 51 connected to S31 power contactor interlock.
Identify faulty wiring and rectify.
b) If the voltage is more than 65V, check the voltage be-
tween S31FB and locomotive 4 wire.

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Chapter 5 - Low Priority Faults Medha Servo Drives Pvt Ltd.

▪ If the voltage is zero, the interlock is faulty.
Replace the interlock/aux. Contact.
▪ If the voltage is more than 65V,
• Check the slackness of the digital input connector
at MEP control unit. If the connector is slack, tight-
en the connector.
• Check the continuity of the wire S31FB from the
digital input connector to S31 contactor. If neces-
sary, replace the cable.
3. If the Green LED is glowing and corresponding yellow LED is
not glowing on the digital input card, then digital input card is defec-
tive. Replace the digital input card.
DISPLAY TO DRIVER No

Ver2 Ver2A Ver3 Ver4

Applicable for
YES YES YES YES

PARAMETER DESCRIPTION
FAULT CODE 1198
P1/ P4 (WDP1) Auxiliary Contact circuit open. Run Auto/ Manual
FAULT MESSAGE
Tests
RESTRICTIONS Dynamic braking prohibited.
ALARM BELL Nil
Low, Manual
RESET LEVEL If the fault condition is still present when cleared manually, the fault
is generated again.
Automatic when the P1/ P4 (WDP1) power contactor Aux. Contact
FAULT RECOVERY
closes
1. Defective Power contactor.
PROBABLE CAUSES 2. Defective wiring.
3. Defective digital output card.
Set the display mode to 'Manual Test for outputs' under 'Test Mode'
available in main menu. The display exhibits certain conditions to be
fulfilled. After that, press 'Enter' key to start testing of outputs. Ensure
control air pressure is 5 kg /cm2 .

Select 'P1/ P4 (WDP1) CL' and then press Enter key to test P1/ P4
(WDP1) power contactor. Press 'F1/ 1' to energize the contactor and
'F2/ 0' to de-energize the contactor.

1. Press 'F1/ 1' to energize the P1/ P4 (WDP1) power contactor. If

the contactor is not picking up, check the voltage across the operating
coil of the magnet valve.
FAULT ISOLATION A) If the voltage is zero, check the voltage between wire
51/13 at the coil terminal and locomotive 4 wire.
a) If the voltage is zero, check the continuity of 51/
13 wire connected to the coil terminal.
b) If the voltage is more than 65 V, check the voltage
between locomotive 51/ 13 wire and P1/ P4CL
(WDP1) wire at the coil terminal.
▪ If the voltage is zero, negative path is not getting
through MEP.
▪ If the voltage is zero, negative path is not get
ting through MEP.
• Check the slackness of the Digital output cable connec-
tor at MEP control unit. If found slack, tighten the con-
nector.

244 IM-203 rev 0

Medha Servo Drives Pvt Ltd. MEP Troubleshooting Manual

• Check the continuity of wire marker P1/ P4 (WDP1) from

P1/ P4 (WDP1) coil terminal to digital output connector.
If necessary, replace the cable.
• If still voltage is zero, the digital output card might be
defective. Replace the card and check once again.
B) If the voltage is more than 65V and still power contactor
is not picking up, then the power contactor or magnet
valve or pneumatic circuit is defective. Identify and
replace the component/contactor.

2. Press 'F2/ 0' to de-energize the power contactor. While tog-

gling the power contactor, check the input status (P1/
P4(WDP1) FB healthy status) on the digital input card .
With power contactor being energized, both the LEDs
should glow on the digital input card.
• If the Green LED is not glowing on the digital input
card, check the voltage between wire 51 at the power
contactor Aux. Interlock and locomotive 4 wire.
FAULT ISOLATION a) If the voltage is zero, check the continuity of the
wire Loop 51 connected to P1/ P4 power contactor
interlock. Identify faulty wiring and rectify.
a) If the voltage is more than 65V, check the voltage
between P1FB and locomotive 4 wire.
▪ If the voltage is zero, the interlock is faulty.
Replace the interlock/aux. Contact.
▪ If the voltage is more than 65V,
• Check the slackness of the digital input connector at
MEP control unit. If the connector is slack, tighten the
connector.
• Check the continuity of the wire P1/ P4(WDP1) FB from
the digital input connector to P1/ P4(WDP1) contactor.
If necessary, replace the cable.
3. If the Green LED is glowing and corresponding yellow LED
is not glowing on the digital input card, then digital input
card is defective. Replace the digital input card.
DISPLAY TO DRIVER Yes

Ver2 Ver2A Ver3 Ver4

Applicable for
YES YES YES YES

IM-203 rev 0 245

Chapter 5 - Low Priority Faults Medha Servo Drives Pvt Ltd.

PARAMETER DESCRIPTION
FAULT CODE 1199
FAULT MESSAGE P21 Auxiliary Contact circuit open. Run Auto/ Manual Test
RESTRICTIONS Dynamic brake prohibited
ALARM BELL Nil
Low, Manual
RESET LEVEL If the fault condition is still present when cleared manually, the fault is
generated again.
FAULT RECOVERY Automatic when the P21 power contactor Aux. Contact closes
1. Defective Power contactor
PROBABLE CAUSES 2. Defective wiring.
3. Defective digital output card.
Set the display mode to 'Manual Test for outputs' under 'Test Mode'
available in main menu. The display exhibits certain conditions to be
fulfilled. After that press 'Enter' key to start testing of outputs. Ensure
control air pressure is 5 kg/ cm2.

Select 'P21 CL' and then press Enter key to test P21 power contactor.
Press 'F1/1' to energize the contactor and 'F2/0' to de-energize the
contactor.

1. Press 'F1/1' to energize the P21 power contactor. If the contactor is

not picking up, check the voltage across the operating coil of the magnet
valve.
A) If the voltage is zero, check the voltage between wire 51/13
at the coil terminal and locomotive 4 wire.
a) If the voltage is zero, check the continuity of 51/13
wire connected to the coil terminal.
b) If the voltage is more than 65 V, check the voltage
between locomotive 51/ 13 wire and P21CL wire at the
coil terminal.
▪ If the voltage is zero, negative path is not getting
through MEP.
FAULT ISOLATION • Check the slackness of the digital output cable connector
at MEP control unit. If found slack, tighten the connector.
• Check the continuity of wire marker P21CL from P21 coil
terminal to digital output connector. If necessary, replace
the cable.
• If still voltage is zero, the digital output card might be
defective. Replace the card and check once again.
B) If the voltage is more than 65V and still power contactor is
not picking up, then the power contactor or magnet valve or
pneumatic circuit is defective. Identify and replace the
component/contactor.

2. Press 'F2/0' to de-energize the power contactor. While toggling the

power contactor, check the input status (P21 FB healthy status) on
the digital input card . With power contactor being energized, both
the LEDs should glow on the digital input card.
• If the Green LED is not glowing on the digital input card, check
the voltage between wire 51/ 13 at the power contactor Aux.
Interlock and locomotive 4 wire.
a) If the voltage is zero, check the continuity of the wire Loop
51 connected to P2 power contactor interlock. Identify faulty
wiring and rectify.

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Medha Servo Drives Pvt Ltd. MEP Troubleshooting Manual

PARAMETER DESCRIPTION
b) If the voltage is more than 65 V, check the voltage between
P21FB and locomotive 4 wire.
▪ If the voltage is zero, the interlock is faulty.
Replace the interlock/aux. Contact.
▪ If the voltage is more than 65 V,
• Check the slackness of the digital input connector at MEP
FAULT ISOLATION
control unit. If the connector is slack, tighten the connector.
• Check the continuity of the wire P21FB from the digital input
connector to P21 contactor. If necessary, replace the cable.
3. If the Green LED is glowing and corresponding yellow LED is not
glowing on the digital input card, then digital input card is defective.
Replace the digital input card.
DISPLAY TO DRIVER Yes

Ver2 Ver2A Ver3 Ver4

Applicable for
YES YES YES YES

IM-203 rev 0 247

Chapter 5 - Low Priority Faults Medha Servo Drives Pvt Ltd.

PARAMETER DESCRIPTION
FAULT CODE 1200
FAULT MESSAGE P31 Auxiliary Contact circuit open. Run Auto/ Manual Test
RESTRICTIONS Dynamic braking prohibited.
ALARM BELL Nil
Low, Manual
RESET LEVEL If the fault condition is still present when cleared manually, the fault
is generated again.
FAULT RECOVERY Automatic when the P31 power contactor Aux. Contact closes
1. Defective power contactor
PROBABLE CAUSES 2. Defective wiring
3. Defective digital output card
Set the display mode to 'Manual Test for outputs' under 'Test Mode'
available in main menu. The display exhibits certain conditions to
be fulfilled. After that, press 'Enter' key to start testing of outputs.
Ensure control air pressure is 5 kg/ cm2.

Select 'P31 CL' and then press Enter key to test P31power contactor.
Press 'F1/ 1' to energize the contactor and 'F2/ 0' to de-energize the
contactor.

1. Press 'F1/ 1' to energize the P31 power contactor. If the contactor
is not picking up, check the voltage across the operating coil of
the magnet valve.
A) If the voltage is zero, check the voltage between wire
51/ 13 at the coil terminal and locomotive 4 wire.
a) If the voltage is zero, check the continuity of
51/ 13 wire connected to the coil terminal.
b) If the voltage is more than 65 V, check the voltage
between locomotive 51/ 13 wire and P31CL wire at
the coil terminal.
▪ If the voltage is zero, negative path is not getting
through MEP.
• Check the slackness of the digital output cable
connector at MEP control unit. If found slack,
FAULT ISOLATION tighten the connector.
• Check the continuity of wire marker P31CL from
P31 coil terminal to digital output connector. If
necessary, replace the cable.
• If still voltage is zero, the digital output card might
be defective. Replace the card and check once
again.
B) If the voltage is more than 65 V and still power contactor
is not picking up, then the power contactor or magnet
valve or pneumatic circuit is defective. Identify and
replace the component/ contactor.

2. Press 'F2/0' to de-energize the power contactor. While toggling

the power contactor, check the input status (P31 FB healthy
status) on the digital input card . With power contactor being
energized, both the LEDs should glow on the digital input card.
• If the Green LED is not glowing on digital input card, check
the voltage between wire 51 at the power contactor Aux.
Interlock and locomotive 4 wire.
a) If the voltage is zero, check the continuity of the wire
Loop 51 connected to P31 power contactor interlock.
Identify faulty wiring and rectify.
b) If the voltage is more than 65 V, check the voltage
between P31FB and locomotive 4 wire.

248 IM-203 rev 0

Medha Servo Drives Pvt Ltd. MEP Troubleshooting Manual

• If the voltage is zero, the interlock is faulty. Replace

the interlock/ aux. contact.
▪ If the voltage is more than 65 V,
• Check the slackness of the digital input connector at MEP
control unit. If the connector is slack, tighten the connector.
FAULT ISOLATION
• Check the continuity of the wire P31FB from the digital input
connector to P31 contactor. If necessary, replace the cable.
3. If the Green LED is glowing and corresponding yellow LED is not
glowing on the digital input card, then digital input card is
defective. Replace the digital input card.
DISPLAY TO DRIVER Yes

Ver2 Ver2A Ver3 Ver4

Applicable for
YES YES YES YES

IM-203 rev 0 249

Chapter 5 - Low Priority Faults Medha Servo Drives Pvt Ltd.

PARAMETER DESCRIPTION
FAULT CODE 1201
P2/ P1(WDP1) Auxiliary Contact circuit open. Run Auto/ Manual
FAULT MESSAGE
Test
RESTRICTIONS None
ALARM BELL Nil
Low, Manual
RESET LEVEL If the fault condition is still present when cleared manually, the fault
is generated again.
Automatic when the P2/ P1 (WDP1) power contactor Aux. Contact
FAULT RECOVERY
closes
1. Defective Power contactor.
PROBABLE CAUSES 2. Defective wiring.
3. Defective digital output card.
Set the display mode to 'Manual Test for outputs' under 'Test Mode'
available in main menu. The display exhibits certain conditions to
be fulfilled. After that press 'Enter' key to start testing of outputs.
Ensure control air pressure is 5 kg/ cm2.

Select 'P2/ P1(WDP1) CL' and then press Enter key to test P2/
P1(WDP1) power contactor. Press 'F1/1' to energize the contactor
and 'F2/0' to de-energize the contactor.

1. Press 'F1/1' to energize the P2/P1 (WDP1) power contactor. If

the contactor is not picking up, check the voltage across the
operating coil of the magnet valve.
A) If the voltage is zero, check the voltage between wire
51/13 at the coil terminal and locomotive 4 wire.
a) If the voltage is zero, check the continuity of
51/13 wire connected to the coil terminal.
b) If the voltage is more than 65V, check the voltage
between locomotive 51 wire and P2/ P1 (WDP1) CL
wire at the coil terminal.
▪ If the voltage is zero, negative path is not getting
FAULT ISOLATION through MEP.
• Check the slackness of the digital output cable
connector at MEP control unit. If found slack,
tighten the connector.
• Check the continuity of wire marker P2/
P1(WDP1) CL from P2/ P1(WDP1) coil terminal
to digital output connector. If necessary, replace
the cable.
• If still voltage is zero, the digital output card might
be defective. Replace the card and check once
again.
B) If the voltage is more than 65V and still power contactor
is not picking up, then the power contactor or magnet
valve or pneumatic circuit is defective. Identify and
replace the component/contactor.

2. Press 'F2/0' to de-energize the power contactor. While toggling

the power contactor, check the input status (P2/P1(WDP1) FB
healthy status) on the digital input card . With power contactor
being energized, both the LEDs should glow on digital input
card.

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PARAMETER DESCRIPTION
• If the Green LED is not glowing on digital input card, check
the voltage between wire 51 at the power contactor Aux.
Interlock and locomotive 4 wire.
a) If the voltage is zero, check the continuity of the wire Loop
51 connected to P2/ P1(WDP1) power contactor inter-
lock. Identify faulty wiring and rectify.
b) If the voltage is more than 65 V, check the voltage
between P2/ P1 (WDP1) FB and locomotive 4 wire.
▪ If the voltage is zero, the interlock is faulty. Replace
the interlock/ aux. Contact.
FAULT ISOLATION
▪ If the voltage is more than 65 V,
• Check the slackness of the digital input connector at
MEP control unit. If the connector is slack, tighten
the connector.
• Check the continuity of the wire P2/ P1 (WDP1) FB
from the digital input connector to P2/ P1 (WDP1)
contactor. If necessary, replace the cable.
3. If the Green LED is glowing and corresponding yellow LED is not
glowing on the digital input card, then digital input card. Replace
the digital input card.
DISPLAY TO DRIVER No

Ver2 Ver2A Ver3 Ver4

Applicable for
YES YES YES YES

IM-203 rev 0 251

Chapter 5 - Low Priority Faults Medha Servo Drives Pvt Ltd.

PARAMETER DESCRIPTION
FAULT CODE 1202
P22/ P3 (WDP1) Auxiliary Contact circuit open. Run Auto/ Manual
FAULT MESSAGE
Test
RESTRICTIONS None
ALARM BELL Nil
Low, Manual
RESET LEVEL If the fault condition is still present when cleared manually, the fault
is generated again.
Automatic when the P22/ P3 (WDP1) power contactor Aux. Contact
FAULT RECOVERY
closes
1. Defective Power contactor.
PROBABLE CAUSES 2. Defective wiring.
3. Defective digital output card.
Set the display mode to 'Manual Test for outputs' under 'Test Mode'
available in main menu. The display exhibits certain conditions to be
fulfilled. After that press 'Enter' key to start testing of outputs. Ensure
control air pressure is 5 kg/cm2 .

Select 'P22/P3 (WDP1) CL' and then press Enter key to test P22/P3
(WDP1) power contactor. Press 'F1/1' to energize the contactor and
'F2/ 0' to de-energize the contactor.

1. Press 'F1/ 1' to energize the P22/ P3 power contactor. If the

contactor is not picking up, check the voltage across the
operating coil of the magnet valve.
A) If the voltage is zero, check the voltage between wire
51/13 at the coil terminal and locomotive 4 wire.
a) If the voltage is zero, check the continuity of
51/13 wire connected to the coil terminal.
b) If the voltage is more than 65V, check the voltage
between locomotive 51/13 wire and P22/P3 (WDP1)
CL wire at the coil terminal.
▪ If the voltage is zero, negative path is not getting
through MEP.
• Check the slackness of the digital output cable
FAULT ISOLATION connector at MEP control unit. If found slack,
tighten the connector.
• Check the continuity of wire marker P22/ P3
(WDP1) CL from P22/ P3 (WDP1) coil terminal
to digital output connector. If necessary, replace
the cable.
• If still voltage is zero, the digital output card might
be defective. Replace the card and check once
again.
B) If the voltage is more than 65 V and still power contactor
is not picking up, then the power contactor or magnet
valve or pneumatic circuit is defective. Identify and
replace the component/ contactor.

2. Press 'F2/0' to de-energize the power contactor. While toggling

the power contactor, check the input status (P22/ P3 (WDP1) FB
healthy status) on the digital input card. With power contactor
being energized, both the LEDs should glow on digital input card.
• If the Green LED is not glowing on digital input card, check
the voltage between wire 51 at the power contactor Aux.
Interlock and locomotive 4 wire.
a) If the voltage is zero, check the continuity of the wire Loop
51 connected to P22/ P3 (WDP1) power contactor interlock.
Identify faulty wiring and rectify.
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PARAMETER DESCRIPTION
b) If the voltage is more than 65 V, check the voltage
between P22/P3 (WDP1) FB and locomotive 4 wire.
▪ If the voltage is zero, the interlock is faulty.
Replace the interlock/aux. Contact.
▪ If the voltage is more than 65V,
• Check the slackness of the digital input connector at MEP
FAULT ISOLATION control unit. If the connector is slack, tighten the connector.
• Check the continuity of the wire P22/ P3 (WDP1) FB from the
digital input connector to P22/ P3 (WDP1) contactor. If
necessary, replace the cable.
3. If the Green LED is glowing and corresponding yellow LED is not
glowing on the digital input card, then digital input card is
defective. Replace the digital input card.
DISPLAY TO DRIVER No

Ver2 Ver2A Ver3 Ver4

Applicable for
YES YES YES YES

IM-203 rev 0 253

Chapter 5 - Low Priority Faults Medha Servo Drives Pvt Ltd.

PARAMETER DESCRIPTION
FAULT CODE 1203
P32/ P2 (WDP1) Auxiliary Contact circuit open. Run Auto/ Manual
FAULT MESSAGE
Test
RESTRICTIONS Dynamic brake prohibited
ALARM BELL Nil
Low, Manual
RESET LEVEL If the fault condition is still present when cleared manually, the fault
is generated again.
Automatic when the P32 /P2 (WDP1) power contactor Aux. contact
FAULT RECOVERY
closes
1. Defective Power contactor.
PROBABLE CAUSES 2. Defective wiring.
3. Defective digital output card.
Set the display mode to 'Manual Test for outputs' under 'Test Mode'
available in main menu. The display exhibits certain conditions to be
fulfilled. After that press 'Enter' key to start testing of outputs. Ensure
control air pressure is 5 kg/cm2.

Select 'P32/ P2 (WDP1) CL' and then press Enter key to test P32/
P2 (WDP1) power contactor. Press 'F1/1' to energize the contactor
and 'F2/0' to de-energize the contactor.

Medha Servo Drives Pvt Ltd. MEP Troubleshooting Manual

PARAMETER DESCRIPTION
FAULT CODE 1211
FAULT MESSAGE Communication with Electronic Governor Faulty
RESTRICTIONS None
ALARM BELL Nil
Medium, Manual
RESET LEVEL If the fault condition is still present when cleared manually, the fault
is generated again.
Automatic when the communication between MEP and electronic
FAULT RECOVERY
governor is established.
This fault is logged in locos fitted with both MEP and MEG.
PROBABLE CAUSES
• Defective communication cable between MEP and MEG
1. Defective communication cable, replace the cable and check the
FAULT ISOLATION communication.
2. Provided 'MEG com. Enabled' flag should be in ON condition.
DISPLAY TO DRIVER No

Ver2 Ver2A Ver3 Ver4

Applicable for
YES YES YES YES

PARAMETER DESCRIPTION
FAULT CODE 1214
FAULT MESSAGE AUX/ ADB1 Power Supply faulty
RESTRICTIONS Warning only
ALARM BELL Nil
Medium, Manual
RESET LEVEL If the fault condition is still present when cleared manually, the fault
is generated again.
Automatic when the AUX ADB/ ADB1 power supply is detected as
FAULT RECOVERY
normal
Most probably this fault accompany with associated sensors
(Connected to the AUXADB /ADB1) faulty.
PROBABLE CAUSES
1. Defective Analog distribution box.
2. Defective wiring.
This fault is logged whenever the low voltage power supply generated
within the ADB is out of the set range. Some times due to sensor
being defective, there may be excess load on the power supply and
the voltage may go below the set limit and log this fault. The digital
input signal becomes zero and fault is logged. To identify this, remove
the sensor connectors on the ADB one by one and observe digital
input status of ADB health through input LED on the digital input card
.While removing any sensor connector, if the input LED glows, it
indicates that the sensor is loading the power supply. Replace the
respective sensor or cable to isolate the problem
FAULT ISOLATION
Even after removing all the sensors, if the Green LED status is zero
then:

1. Replace ADB and check up.

2. Replace the cable and check up.
3. Check for disconnected wires of ADB at back side TB
4. Check the continuity of ADB health input from TB to the ADB
Power supply Cable connector. If necessary, replace the cable.
5. Check the input status on the digital input card

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Chapter 5 - Low Priority Faults Medha Servo Drives Pvt Ltd.

PARAMETER DESCRIPTION

6. If the green LED is glowing and corresponding Yellow LED is not

FAULT ISOLATION
glowing, then digital input card is defective. Replace and check up.

DISPLAY TO DRIVER No

Ver2 Ver2A Ver3 Ver4

Applicable for
YES YES YES YES

PARAMETER DESCRIPTION
FAULT CODE 1215
Main Reservoir Pressure Sensor Faulty.
FAULT MESSAGE
Air Compressor overloading
RESTRICTIONS Warning only
ALARM BELL Nil
Medium, Manual
RESET LEVEL If the fault condition is still present when cleared manually, the fault
is generated again.
Automatic after the Main Reservoir Pressure Sensor has been found
FAULT RECOVERY
to function normally.
1. MRPR pressure sensor faulty
2. Defective cables
PROBABLE CAUSES
3. Defective ADB
4. Defective Analog input card

1. Set the display to show Auxiliary Generator parameters by

Chapter 5 - Low Priority Faults Medha Servo Drives Pvt Ltd.

PARAMETER DESCRIPTION
FAULT CODE 1231
FAULT MESSAGE Wrong Engine RPM at Notch 4.
RESTRICTIONS Warning only
ALARM BELL Nil
Low, Manual
RESET LEVEL If the fault condition is still present when cleared manually, the fault
is generated again.

FAULT RECOVERY Automatic when the Engine RPM is found to be within set limits.

1. Erratic engine RPM.

PROBABLE CAUSES 2. Governor amphonal plug is slack.
3. Defective wiring.
1. Check the engine RPM with a standard RPM meter in notch 4.
2. If RPM is more or less by 35 RPM, than the set Notch 4 RPM (by
default 650), adjust the RPM in the Governor so that the RPM is
within the set limit.
3. If the measured RPM is not as per notch and erratic,
A) Check the slackness of Governor amphonal plug. If slack,
tighten the plug.
FAULT ISOLATION B) Check the wiring of the governor amphonal plug at the
backside TB.
C) Check the continuity of the wires 15A, 12A, 7C and 3A from
TB to the Governor amphonal plug pins. If necessary, replace
the amphonal plug wiring.
D) Check for correct sequence of solenoids (AV, BV, CV and
DV) operation in the governor as per the notch. If necessary,
change the governor.
DISPLAY TO DRIVER No

Ver2 Ver2A Ver3 Ver4

Applicable for
YES YES YES YES

PARAMETER DESCRIPTION
FAULT CODE 1232
FAULT MESSAGE Wrong Engine RPM at Notch 5.
RESTRICTIONS Warning only
ALARM BELL Nil
Low, Manual
RESET LEVEL If the fault condition is still present when cleared manually, the fault
is generated again.
FAULT RECOVERY Automatic when the Engine RPM is found to be within set limits.
1. Erratic engine RPM.
PROBABLE CAUSES 2. Governor amphonal plug is slack.
3. Defective wiring
1. Check the engine RPM with a standard RPM meter in notch 5.
2. If RPM is more or less by 35 RPM, than the set Notch 5 RPM (by
default 750), adjust the RPM in the Governor so that the RPM is
FAULT ISOLATION within the set limit.
3. If the measured RPM is not as per notch and erratic,
A) Check the slackness of Governor amphonal plug. If slack,
tighten the plug.

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PARAMETER DESCRIPTION
B) Check the wiring of the governor amphonal plug at the
backside TB.
C) Check the continuity of the wires 15A, 12A, 7C and 3A from
TB to the Governor amphonal plug pins. If necessary, replace
FAULT ISOLATION
the amphonal plug wiring.
D) Check for correct sequence of solenoids (AV, BV, CV and
DV) operation in the governor as per the notch. If necessary,
change the governor.
DISPLAY TO DRIVER No

Ver2 Ver2A Ver3 Ver4

Applicable for
YES YES YES YES

PARAMETER DESCRIPTION
FAULT CODE 1233
FAULT MESSAGE Wrong Engine RPM at Notch 6.
RESTRICTIONS Warning only
ALARM BELL Nil
Low, Manual
RESET LEVEL If the fault condition is still present when cleared manually, the fault
is generated again.

FAULT RECOVERY Automatic when the Engine RPM is found to be within set limits.

Applicable for
YES YES YES YES

PARAMETER DESCRIPTION
FAULT CODE 1239
FAULT MESSAGE Traction Motor 4 High Current to be Confirmed
RESTRICTIONS Warning only
ALARM BELL Nil
Low, Manual
RESET LEVEL If the fault condition is still present when cleared manually, the fault
is generated again.
Automatic when the Tr. Motor No.4 current is reduced to normal or
FAULT RECOVERY
the TM4AI current sensor is identified as faulty.
PROBABLE CAUSES Refer fault code 1040
FAULT ISOLATION Reset the fault manually.
DISPLAY TO DRIVER No

Ver2 Ver2A Ver3 Ver4

Applicable for
YES YES YES YES

PARAMETER DESCRIPTION
FAULT CODE 1240
FAULT MESSAGE Traction Motor 5 High Current to be Confirmed
RESTRICTIONS Warning only
ALARM BELL Nil
Low, Manual
RESET LEVEL If the fault condition is still present when cleared manually, the fault
is generated again.
Automatic when the Tr. Motor No.5 current is reduced to normal
FAULT RECOVERY
or the TM5AI current sensor is identified as faulty.
PROBABLE CAUSES Refer fault code 1041
FAULT ISOLATION Reset the fault manually.
DISPLAY TO DRIVER No

280 IM-203 rev 0

Medha Servo Drives Pvt Ltd. MEP Troubleshooting Manual

Ver2 Ver2A Ver3 Ver4

Applicable for
YES YES YES YES

PARAMETER DESCRIPTION
FAULT CODE 1241
FAULT MESSAGE Traction Motor 6 High Current to be Confirmed
RESTRICTIONS Warning only
ALARM BELL Nil
Low, Manual
RESET LEVEL If the fault condition is still present when cleared manually, the fault
is generated again.
Automatic when the Tr. Motor No.6 current is reduced to normal or
FAULT RECOVERY
the TM6AI current sensor is identified as faulty.
PROBABLE CAUSES Refer fault code 1042
FAULT ISOLATION Reset the fault manually.
DISPLAY TO DRIVER No

Ver2 Ver2A Ver3 Ver4

Applicable for
YES YES YES YES

PARAMETER DESCRIPTION
FAULT CODE 1242
FAULT MESSAGE Traction Motor Speed Sensor 1 Faulty
RESTRICTIONS None
ALARM BELL Nil
Medium, Manual
RESET LEVEL If the fault condition is still present when cleared manually, the fault
is generated again.
FAULT RECOVERY None
1. Defective speed sensor cable.
2. Defective speed sensor.
PROBABLE CAUSES
3. Defective RDB
4. Defective Frequency input card.
1. Reset the fault manually.
2. Check for any cable cut or disconnection from the Tr.Motor 1
speed sensor to RDB.
3. Check for slackness Tr.Motor 1 speed sensor cable connector
available on bottom of the chassis. If slack, tighten the connector.
4. Check the continuity of the individual wires of the cable from
FAULT ISOLATION under chassis to RDB. If any open circuit is found, replace the
cable.
5. Check the continuity of 19-core cable from RDB to MEP control
unit.
6. If cable found normal and still the fault is logging frequently,
A) Replace the Tr. Motor speed sensor and check up.
B) Replace the frequency input card and check up.
DISPLAY TO DRIVER No

Applicable for
YES YES YES YES

IM-203 rev 0 283

Chapter 5 - Low Priority Faults Medha Servo Drives Pvt Ltd.

PARAMETER DESCRIPTION
FAULT CODE 1246
FAULT MESSAGE Traction Motor Speed Sensor 5 Faulty
RESTRICTIONS None
ALARM BELL Nil
MEDIUM, Manual
RESET LEVEL If the fault condition is still present when cleared manually, the fault
is generated again.
FAULT RECOVERY None
1. Defective speed sensor cable.
2. Defective speed sensor.
PROBABLE CAUSES
3. Defective RDB.
4. Defective Frequency input card.
1. Reset the fault manually.
2. Check for any cable cut or disconnection from the Tr.Motor 5
speed sensor to RDB.
3. Check for slackness Tr.Motor 5 speed sensor cable connector
available on bottom of the chassis. If slack, tighten the connector.
4. Check the continuity of the individual wires of the cable from
FAULT ISOLATION under chassis to RDB. If any open circuit is found, replace the
cable.
5. Check the continuity of 19-core cable from RDB to MEP control
unit.
6. If cable found normal and still the fault is logging frequently,
A) Replace the Tr. Motor speed sensor and check up.
B) Replace the frequency input card and check up.
DISPLAY TO DRIVER No

Ver2 Ver2A Ver3 Ver4

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PARAMETER DESCRIPTION
1. Set the display to show mixed parameters by selecting 'Display'
mode from the main menu and then selecting 'Mixed' sub-menu.
2. Check the Braking cylinder pressure displayed in the display unit
with the calibrated Pneumatic gauge.
3. If the difference is excess, replace the sensor and check up.
4. If the difference is negligible but still the fault is logging,
A) Check slackness of the connectors either at the sensor or at
the ADB. Tighten both cable connectors at the sensor and
ADB
FAULT ISOLATION
B) Defective interconnecting cable between sensor and ADB.
Replace the cable and check up.
C) Slackness of the connectors either at ADB or MEP control
unit. Tighten both cable connectors at ADB and MEP control
unit
D) Defective interconnecting cable between ADB and MEP
control unit.
E) Defective ADB. Replace the ADB and check.
F) Defective Analog input card. Replace the card and check up.
DISPLAY TO DRIVER No

Ver2 Ver2A Ver3 Ver4

Applicable for
YES YES YES YES

PARAMETER DESCRIPTION
FAULT CODE 1262
FAULT MESSAGE Lube Oil Pressure Sensor Faulty
RESTRICTIONS None
ALARM BELL Nil
MEDIUM, Manual
RESET LEVEL If the fault condition is still present when cleared manually, the fault
is generated again.
FAULT RECOVERY Automatic when the Lube Oil Pressure sensor found working normal.
1. Defective/ blocked pressure pipelines.
2. Defective Lube Oil Pressure sensors (LOP).
PROBABLE CAUSES 3. Defective cables.
4. Defective ADB.
5. Defective Analog input card.
1. Set the display to show MCBG Screen by selecting 'Display' mode
from the main menu and then selecting 'MCBG Screen' sub-menu
2. Check the lube oil pressure displayed in the display unit with a
calibrated gauge.
3. If the difference is excess, replace the sensor and check up.
4. If the difference is negligible but still the fault is logging,
A) Check slackness of the connectors either at the sensor or at
the ADB. Tighten the both cable connectors at the sensor
and ADB
B) Defective interconnecting cable between sensor and ADB.
FAULT ISOLATION
Replace the cable and check up.
C) Slackness of the connectors either at ADB or MEP
control unit. Tighten the both cable connectors at ADB and
MEP control unit.
D) Defective interconnecting cable between ADB and MEP
control unit.
E) Defective ADB. Replace the ADB and check.
F) Defective Analog input card. Replace the card and check up.

IM-203 rev 0 289

Chapter 5 - Low Priority Faults Medha Servo Drives Pvt Ltd.

Ver2 Ver2A Ver3 Ver4

Applicable for
YES YES YES YES

PARAMETER DESCRIPTION
FAULT CODE 1263
FAULT MESSAGE Boosted Air Pressure Sensor Faulty
RESTRICTIONS None
ALARM BELL Nil
MEDIUM, Manual
RESET LEVEL If the fault condition is still present when cleared manually, the fault
is generated again.
Automatic when the Boosted Air Pressure sensor is found working
FAULT RECOVERY
normal.
1 Booster Air Pressure sensors (BAP) faulty.
2 Defective cables.
PROBABLE CAUSES
3 Defective ADB.
4 Defective Analog input card.
1. Set the display to show MCBG Screen by selecting 'Display' mode
from the main menu and then selecting 'MCBG Screen' sub-menu
2. Check the booster air pressure displayed in the display unit with
Pneumatic gauge.
3. If the difference is excess, replace the sensor and check up
4. If the difference is negligible but still the fault is logging frequently
A) Check slackness of the connectors either at the sensor or at
the ADB. Tighten the both cable connectors at the sensor
and ADB
FAULT ISOLATION B) Defective interconnecting cable between sensor and ADB.
Replace the cable and check up.
C) Slackness of the connectors either at ADB or MEP
control unit. Tighten the both cable connectors at ADB and
MEP control unit.
D) Defective interconnecting cable between ADB and MEP
control unit.
E) Defective ADB. Replace the ADB and check.
F) Defective Analog input card . Replace the card and check
up.
DISPLAY TO DRIVER No

Ver2 Ver2A Ver3 Ver4

Applicable for
YES YES YES YES

PARAMETER DESCRIPTION
FAULT CODE 1264
FAULT MESSAGE Fuel Oil Pressure Sensor Faulty
RESTRICTIONS None
ALARM BELL Nil
MEDIUM, Manual
RESET LEVEL If the fault condition is still present when cleared manually, the fault
is generated again.
Automatic when the Fuel Oil Pressure sensor is found working
FAULT RECOVERY
normal.

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PARAMETER DESCRIPTION
1. Fuel Oil Pressure sensor (FOP) faulty.
2. Defective cables.
PROBABLE CAUSES
3. Defective ADB.
4. Defective Analog input card.
1. Set the display to show MCBG Screen by selecting 'Display' mode
from the main menu and then selecting 'MCBG Screen' sub-menu
2. Check the fuel oil pressure displayed in the display unit with
Pneumatic gauge.
3. If the difference is excess, replace the sensor and check up
4. If the difference is negligible but still the fault is logging frequently
A) Check slackness of the connectors either at the sensor or at
the ADB. Tighten the both cable connectors at the sensor
and ADB.
FAULT ISOLATION B) Defective interconnecting cable between sensor and ADB.
Replace the cable and check up.
C) Slackness of the connectors either at ADB or MEP control
unit. Tighten the both cable connectors at ADB and MEP
control unit.
D) Defective interconnecting cable between ADB and MEP
control unit.
E) Defective ADB. Replace the ADB and check.
F) Defective Analog input card . Replace the card and check
up.
DISPLAY TO DRIVER No

Ver2 Ver2A Ver3 Ver4

Applicable for
YES YES YES YES

PARAMETER DESCRIPTION
FAULT CODE 1266
FAULT MESSAGE External Positive Power Supply 1 of PSM1 is Faulty
RESTRICTIONS None
ALARM BELL Nil
Medium, Manual. If the fault condition is still present when cleared
RESET LEVEL
manually, the fault is generated again.
FAULT RECOVERY Automatic if external positive supply 1 is healthy.
PROBABLE CAUSES Power supply card might be slack/defective.
Note: Loco performance does not get effected, if this power supply
is faulty.
FAULT ISOLATION 1. Press the Power supply card, if found slack on the control unit and
tighten the card holding screws.
2. Replace the card, if necessary.

Chapter 5 - Low Priority Faults Medha Servo Drives Pvt Ltd.

Ver2 Ver2A Ver3 Ver4

Applicable for
NO NO YES YES

Applicable for
NO NO YES YES

PARAMETER DESCRIPTION
FAULT CODE 1273
FAULT MESSAGE FS26 Auxiliary Contact Circuit open.
RESTRICTIONS None
ALARM BELL Nil
Medium, Manual. If the fault condition is still present when cleared
RESET LEVEL
manually, the fault is generated again.
FAULT RECOVERY Automatic when FS Relay coil status is High and FS26 FB status is
high.

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PARAMETER DESCRIPTION
1. FS26 interlock is bad - Interlock is sticky or bad contact.
2. Disconnected/broken wires at FS26 interlocks.
PROBABLE CAUSES
3. Defective wiring of 51 wire loop.
4. Digital input connector is slack at MEP control unit.
Set the locomotive to IDLE position.
Operate FS26 contactor manually or pick up FS Relay through
manual output test.
1. Check the input status on the Digital input card
2. With FS26 contactor closed, the green LED and yellow LED on
the digital input card should glow.
F) If the Green LED is not glowing, check the FS contactor
interlock for proper operation. If interlocks are operating
freely, clean the interlock and check the Green LED status.
3. Check the voltage between wire 51 at FS26 contactor interlock
and locomotive 4 wire. The voltage should be more than 65 V.
FAULT ISOLATION A) If the voltage is zero, 51 wire loop is defective. Identify and
rectify.
B) If voltage is greater than 65 V, check the voltage between
FS26FB wire and locomotive 4 wire.
a) If the voltage is zero, the interlock is faulty. Change the
FS contactor.
b) If the voltage is less than 65V, the wire connecting the
FS contactor interlock and the connector might be
open circuited. Check the wire continuity between
FS26FB wire terminal to digital input connector. If
necessary, replace the cable.
c) Check the tightness of the digital input cable connector.
DISPLAY TO DRIVER No

Ver2 Ver2A Ver3 Ver4

Applicable for
NO NO YES YES

PARAMETER DESCRIPTION
FAULT CODE 1274
DMR Stuck Closed.
FAULT MESSAGE
Run Auto/Manual Tests
RESTRICTIONS None
ALARM BELL None
Low, Manual
RESET LEVEL If the fault condition is still present when cleared manually, the fault
will be generated again.
FAULT RECOVERY Automatic when the DMR interlock found open..
1. Defective DMR relay
PROBABLE CAUSES 2. Defective wiring.
3. Defective digital output card
FAULT ISOLATION 1. Shut down the engine. Switch ON MB1, MB2, MPCB, MFPB1,
and MFPB2 circuit breakers. Check the status of the DMR relay.
2. If DMR Relay is in energized position, check the voltage across
the DMR coil terminals.

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PARAMETER DESCRIPTION
a) If the voltage is zero, but relay is in picked up position, the
relay is defective. Replace the relay.
b) If the voltage is more than 65V, output card is defective.
Replace the card and check up.
3. If DMR Relay is in de-energized position, check the input status
on digital input card.
a) If the green LED is glowing, disconnect the wire DMRFB from
the DMR relay interlock. Check the status of the green LED.
FAULT ISOLATION
◦ If the green LED is still glowing, the wire DMRFB is
shorted with some positive wire in the bunch. Identify
and remove the short circuit.
◦ If the green LED is OFF, then the DMR interlock is faulty.
Replace the DMR relay.
4. Run self test for the DMR relay to ensure proper feedback signal
under 'Auto test for relays' in the 'Test Mode' menu available in
main menu.
DISPLAY TO DRIVER Yes

Ver2 Ver2A Ver3 Ver4

Applicable for
NO Yes YES YES

PARAMETER DESCRIPTION
FAULT CODE 1275
FAULT MESSAGE DMR Circuit Open.
Warning: Engine speed may not raise.
RESTRICTIONS None
ALARM BELL None
Low, Manual
RESET LEVEL If the fault condition is still present when cleared manually, the fault will
be generated again.
FAULT RECOVERY Automatic when DMR circuit is detected as closed.
1. Defective DMR relay
PROBABLE CAUSES 2. Defective wiring.
3. Defective digital output card.
After cranking wait for two minutes and check the status of DMR relay.
1. If DMR relay is not picking up, check the supply at DMR relay coil
terminals.
a) If the voltage is more than 65V, and still the relay is not picking
up, then the DMR relay is defective. Replace the relay.
2. If the voltage is zero, check the voltage at coil terminal with respect
to locomotive 4 wire.
• If the voltage is zero, check the continuity of 16-wire loop
FAULT ISOLATION
coming to DMR relay. If necessary, replace the open circuited
or wrong connections.
3. If voltage is more than 65V, check the voltage between locomotive
wire-16 and DMR coil terminal
a) If the voltage is zero,
b) Check slackness of digital output connector at MEP control unit.
If the cable is slack, tighten.

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PARAMETER DESCRIPTION
c) Check the continuity of wire DMRCL from DMR coil terminal to
MEP control unit. If necessary, replace the cable.
d) If continuity is proper, then digital output card is defective.
4. If the DMR relay is picking up, check the input status on digital input
card.
5. If LED is not glowing, check voltage at DMR relay interlock terminal
a) If voltage is zero, check the continuity of 16-wire loop coming
to DMR relay interlock. If necessary, replace open circuited/
wrong connections.
6. If voltage is more than 65V, check the voltage between locomotive
51 wire and DMRFB wire at DMR interlock terminal.
FAULT ISOLATION a) If the voltage is zero, the interlock contact is faulty. Replace the
relay.
7. If the voltage is more than 65V,
a) Check the slackness of the digital input connector at MEP
control unit. If connector is slack, tighten the connector.
b) If connector is tight, check the continuity of the wire DMRFB
from DMR relay interlock to MEP control unit. If necessary,
replace the cable.
8. If the green LED is glowing and corresponding Yellow LED is not
glowing, then digital input card is defective. Replace the digital
input card and check once again.
9. Run 'Auto test for Relays' under 'Test Mode' menu option..
DISPLAY To DRIVER Yes

Ver2 Ver2A Ver3 Ver4

Applicable for
NO No YES YES

PARAMETER DESCRIPTION
FAULT CODE 1276
FAULT MESSAGE APU Engine Shut Down Unexpectedly
RESTRICTIONS May not crank APU engine
ALARM BELL None
RESET LEVEL Low, Manual
FAULT RECOVERY Fault will reset automatically
1. APU Engine RPM suddenly drops to zero, due to external reason
like rack being closed.
2. 12V Alternator might be defective.
PROBABLE CAUSES 3. APU Engine RPM signal not received by MEP due to cable defective.
4. APUERPM cable connector slack.
5. APU LOP switch might be defective.
6. Operator might have pulled APU Manual Shutdown lever.
1. Crank the APU Engine and check for APU Engine RPM signal on
the display.If RPM signal is steady, then the fault is due to the
external reasons. Check the mechanical side for sudden APU engine
FAULT ISOLATION
RPM dropping.
If RPM signal is zero.

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PARAMETER DESCRIPTION
2. Check the RPM signal at 12 V alternator of "W" and ground (E)
point.
If output is normal, check the cable continuity from APU TB to 12
V alternator.
3. Check continuity of the APUERPM cable ID:APU3 of pins to APU
TB, if no continuity, replace the cable (if necessary).
FAULT ISOLATION
4. Check for slackness of the APUERPM cable connector at the RDB
unit.
5. Check the continuity of the APU LOP switch during APU running.
If no continuity, then replace the switch. If continuity is proper,
check the wire continuity and if necessary, replace the cable.

DISPLAY To DRIVER Yes

TE This fault will be logged only when “APU enabled” flag enabled as
NO set (√).

Ver2 Ver2A Ver3 Ver4

Applicable for
Yes Yes YES YES

PARAMETER DESCRIPTION
FAULT CODE 1277
APU Cranking Contactor Circuit open.
FAULT MESSAGE
Warning : May not crank APU engine
RESTRICTIONS Fuel Save mode prohibit
ALARM BELL None
Low, Manual
RESET LEVEL If the fault condition is still present when cleared manually, the fault
will be generated again.
FAULT RECOVERY No Auto Recovery
1. Defective APU cranking contactor.
2. Defective Timer unit.
PROBABLE CAUSES
3. Wiring fault from MEP to cranking contactor coil.
4. Defective Digital output card
This message will be logged during cranking only.
1. Open the SRT12 cable of starter motor at ACC Coil moving contactor.
2. Manually (apply 72V across coil) operate and check free operation
of the APU cranking contactor. Ensure that there is no mechanical
obstruction to operate. If contactor is not picking up, replace the
ACC contactor.
3. Ensure that both digital input Green and Yellow of LED on the digital
FAULT ISOLATION input card are glowing.
4. If the LED is not glowing:
a) Check the voltage at the feedback wire ACC FB at TB with
respective to 4.
b) If the supply voltage is more than 65V, and still the Green &
Yellow LEDs are not glowing, then the digital input card is
defective. Replace the card.

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PARAMETER DESCRIPTION
c) If the supply voltage is still zero, then it is wiring mistake. Identify
from where the supply is dropping.
d) Check the voltage at the feedback wire ACC FB at APU TB-
ACCFB with respective to 4. If voltage is more than 65V, check
the cable continuity and if required, replace the cable from APU
TB to TB
e) If voltage is less than 3V, check the continuity between APU TB
to digital input connector and if required, replace the cable.
f) Check the voltage between 'ACC FB' with respect to '4'
FAULT ISOLATION ◦ If the voltage is more than 12V and replace the Timer unit.
◦ If the voltage is zero, then check continuity between SRT-12
( ACC MC) to Timer Unit. If necessary, replace the corre-
sponding.
g) Connect the SRT12 cable of starter motor at ACC coil moving
contactor.
h) If all the above points are normal, check the APU auto change
over. If APU auto change over has not happened, then check
corresponding input status in digital input card. If required, replace
the card.
DISPLAY To DRIVER Yes

TE This fault will be logged only when “APU enabled” flag enabled as
NO set (√).

Ver2 Ver2A Ver3 Ver4

Applicable for
Yes Yes YES YES

PARAMETER DESCRIPTION
FAULT CODE 1278
APU Cranking Contactor stuck closed.
FAULT MESSAGE Open APU battery cut out switch. Shut down APU engine manually,
if running.
RESTRICTIONS Fuel Save mode prohibit
ALARM BELL None
Low, Manual
RESET LEVEL If the fault condition is still present when cleared manually, the fault
will be generated again.
FAULT RECOVERY No Auto Recovery
1. Defective APU cranking contactor.
2. Defective wiring.
PROBABLE CAUSES
3. Defective digital output card
4. Defective digital input card

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PARAMETER DESCRIPTION
1. Shut down the APU engine. Switch ON MB1, MB2, MPCB, MFPB1
and MFPB2 circuit breakers. Check the status of the APU Cranking
Contactor.
2. If APU cranking contactor is in energized position, check the voltage
across the APU cranking contactor coil terminals.
a) If the voltage is zero, but ACC Contactor is in picked up
position (welded), then ACC Contactor is defective. Replace
the ACC Contactor.
b) If the voltage is more than 65V, digital output card is defective.
Replace the card and check up.
c) If APU cranking contactor is in de-energized position, check
the input status on the digital input card.
FAULT ISOLATION
◦ If the green LED is glowing on digital input card, then
disconnect the wire ACC FB from the APU cranking
contactor. Check the status of the Green LED.
◦ If the Green LED is still glowing, the wire ACC FB is
shorted with some positive wire in the bunch. Identify and
remove the short circuit
◦ If the Green LED is OFF, then the APU cranking contactor
is faulty. Replace the APU cranking contactor.
◦ If the Green LED is OFF, then the APU cranking contactor
is normal. Replace the Timer Unit.
d) Check the ACC contactor status during Main engine to APU
change over.
DISPLAY To DRIVER Yes

TE This fault will be logged only when “APU enabled” flag enabled as
NO set (√).

Ver2 Ver2A Ver3 Ver4

Applicable for
Yes Yes YES YES

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PARAMETER DESCRIPTION
FAULT CODE 1279
APU Fuel Oil Level Low Fault
FAULT MESSAGE
Warning : FUEL SAVE mode prohibited.
RESTRICTIONS Fuel Save mode prohibit
ALARM BELL None
Low, Auto
RESET LEVEL If the fault condition is still present when cleared manually, the fault will
be generated again.
FAULT RECOVERY Automatic when fault is cleared
This message will be logged due to APU Fuel oil Level low as sensed
by AFOL FB available in APU.
PROBABLE CAUSES 1. APU Fuel Oil Level is really dipped below the set limit.
2. Wrong wiring
3. Digital inputcard might be defective.
1. Check the status of digital input Green LED on the Digital input card
If LED is not glowing, check the voltage between wires AFOL FB
and locomotive 4 wire.
a) If voltage is more than 65V, Digital input card might be defective.
b) If the voltage is zero, check the continuity of wire 51 to AFOL
FB.
c) If there is no continuity, then feedback is faulty. Replace the
AFOL FB cable, if necessary.
2. Check the real conditions whether really there is a dip in Fuel oil
level. Identify the root cause for fuel oil level being low.
FAULT ISOLATION a) If fuel oil level is low in the tank,
◦ Check for leakages in fuel tank.
◦ Fill with oil up to required set level into the fuel tank
b) If fuel oil level input is still low.
◦ Check float switch operation by operating manually,
◦ Check the continuity of wires from float switch to APU TB
◦ If wires continuity is normal, then problem is with float
switch, replace with new switch and check again.
3. If all the above points are normal and still AFOL FB is not
coming,Digital input card defective, replace the card and re-check
once.
DISPLAY To DRIVER Yes

TE This fault will be logged only when “APU enabled” flag enabled as
NO set (√).

Ver2 Ver2A Ver3 Ver4

Applicable for
Yes Yes Yes Yes

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PARAMETER DESCRIPTION
FAULT CODE 1280
APU Water Level low/Temperature high.
FAULT MESSAGE
Warning : FUEL SAVE mode prohibited.
RESTRICTIONS Fuel Save mode prohibit
ALARM BELL None
Low, Auto
RESET LEVEL If the fault condition is still present when cleared manually, the fault will
be generated again.
Automatic when APU Water Level low/ Temperature is detected as
FAULT RECOVERY
closed.
This message will be logged if engine is shut down due to APU Water
Level low/ Temperature as sensed by ALWT_IN available in APU.
1. Water level is really dipped below or temperature is greater than the
PROBABLE CAUSES
set limit.
2. Wrong wiring.
3. Digital input card might be defective.
1. Check the real conditions at which the engine is shut down. If really
there is a dip in water level or if temperature is high, identify the root
cause for Water level low or temperature is high.
a) If water level is low in the tank,
◦ Check for leakages in water tank/ recovery tank.
◦ Fill with water up to required set level into the water tank or
recovery tank.
b) If water level low input is still high,
◦ Check water level switch operation manually.
◦ Remove connector from temperature switch, then check the
ALWT_ IN status. If feedback status is normal according to
FAULT ISOLATION water level switch operation, temperature switch might be
defective.
◦ If feedback status is high, water level switch is defective or
malfunctioning. Remove and clean the water level switch
with petrol. If required, replace the switch.
2. Check the input status on the Digital input card . If LED is not glowing,
check the voltage TB( ALWHT_IN wire marker) with respect to 4.
3. If the voltage is zero, check the continuity of wire 51 connecting to
ALWHT_IN. If there is no continuity, then feedback is faulty. Replace
the cable, if necessary.
4. If voltage is more than 65V, Digital input card is defective. Replace
with new Digital input card and recheck once.
DISPLAY To DRIVER Yes

TE This fault will be logged only when “APU enabled” flag enabled as
NO set (√).

Ver2 Ver2A Ver3 Ver4

Applicable for
Yes Yes Yes Yes

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PARAMETER DESCRIPTION
FAULT CODE 1281
APU Lube Oil Pressure Low Fault or Input malfunctioning.
FAULT MESSAGE
Warning : FUEL SAVE mode prohibited.
RESTRICTIONS Fuel Save mode prohibit
ALARM BELL None
RESET LEVEL Medium, Auto

FAULT RECOVERY Automatic when APU Lube Oil Pressure Switch is detected as Low.

This message will be logged, if engine is shut down due to low lube oil
pressure as sensed by ALOPS_IN available in APU.
1. Lube Oil Pressure has really dropped below the set limit.
PROBABLE CAUSES
2. ALOP switch might be defective.
3. Wrong wiring.
3. Digital input card might be defective.
Check the real conditions at which the engine is shut down. If really there
is a drop in ALOP, identify the root cause for ALOP dropping.
1. Close the battery knife switch and prepare the APU for cranking.
2. Manually crank the APU engine by operating ACC.
3. If ALOPS_IN is low.,
a) Check the voltage at wire 51 of ALOPS1 with respect to loco
wire 4.
b) If voltage is less than 3V, check the wire continuity from wire 51
to ALOP Socket. If there is no continuity, then replace the cable
(if necessary).
FAULT ISOLATION c) If the voltage is more than 65V and APU ERPM is available,
then ALOPS input is low in APU TB, ALOPS switch might be
defective.
d) Check the voltage from APU TB to TB. If voltage is less than
3V, check and replace the cable (if necessary).
e) If voltage is more than 65V and still input is not coming, check
the respective wire continuity between TB to MEP. If necessary,
replace the cable.
f) Check the status of digital input green and yellow LEDs on the
digital input card. If LEDs are not glowing, then replace the card
with new one.
DISPLAY To DRIVER Yes

1. Defective APU Shut down Contactor.

PROBABLE CAUSES 2. Defective wiring.
3. Defective digital output card.

Shut down the APU engine. Switch ON MB1, MB2, MPCB, MFPB1,
and MFPB2 circuit breakers. Check the status of the APU Cranking
Contactor.
1. If APU Shut down contactor is in energized position, check the
voltage across the APU cranking contactor coil terminals.
2. If the voltage is zero, but ASC Contactor is in picked up position
(welded), then ASC Contactor is defective. Replace the ASC
Contactor.
3. If the voltage is more than 65V, Digital output card is defective.
Replace the card and check up.
4. If APU Shut down contactor is in de-energized position, check the
input status on the digital input card.
FAULT ISOLATION
a) If the green LED is glowing on digital input card, disconnect the
wire ASC FB from the APU Shut down contactor. Check the
status of the Green LED.
b) If the Green LED is still glowing, the wire ASC FB is shorted
with some positive wire in the bunch. Identify and remove the
short circuit
c) If the Green LED is OFF, then the APU shut down contactor is
faulty. Replace the APU cranking contactor.
d) If the Green LED is OFF, then the APU shut down contactor is
normal. Replace the Timer Unit.
5. Check the ACC contactor status during Main engine to APU change
over.
DISPLAY To DRIVER Yes

TE This fault will be logged only when “APU enabled” flag enabled as
NO set (√).

Ver2 Ver2A Ver3 Ver4

Applicable for
Yes Yes Yes Yes

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PARAMETER DESCRIPTION
FAULT CODE 1285
SMC contactor Stuck Closed.
FAULT MESSAGE
Run Auto/ Manual Tests Warning : FUEL SAVE mode prohibited.
RESTRICTIONS Fuel Save mode prohibit
ALARM BELL None
Low, Auto
RESET LEVEL
After manual reset if the fault is still present, the fault is generated again.
FAULT RECOVERY Automatic when SMC auxiliary contact is detected as low.
1. Defective SMC contactor.
PROBABLE CAUSES 2. Defective wiring.
3. Defective digital output card.
1. Shut down the engine. Switch ON MB1, MB2, MPCB, MFPB1,
and MFPB2 circuit breakers. Check the status of the SMC contactor
2. If SMC contactor is in energized position, check the voltage across
the SMC contactor coil terminals.
a) If the voltage is zero, but Contactor is in picked up position,
the contactor is defective. Replace the contactor.
b) If the voltage is more than 65V, Digital output card is defective.
Replace the card and check up.
c) If SMC contactor is in de-energized position, check the input
FAULT ISOLATION status on the digital input card.
d) If the green LED is glowing, disconnect the wire SMC FB from
the SMC contactor interlock. Check the status of the LEDs.
◦ If the Green LED is still glowing, the wire SMC FB is shorted
with some positive wire in the bunch. Identify and remove
the short circuit.
◦ If the Green LED is OFF, then the SMC contactor interlock
is faulty. Replace the SMC contactor.
3. Run self test for the SMC contactor to ensure proper feedback signal
under ‘Auto test for relays’ in the ‘Test Mode’ menu in main menu.
DISPLAY To DRIVER Yes

TE This fault will be logged only when “APU enabled” flag enabled as
NO set (√).

Ver2 Ver2A Ver3 Ver4

Applicable for
Yes Yes Yes Yes

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PARAMETER DESCRIPTION
FAULT CODE 1286
SMC Contactor Circuit Open.
FAULT MESSAGE
Run Auto/ Manual Tests
RESTRICTIONS None
ALARM BELL None
Low, Auto
RESET LEVEL After manual reset if the fault still present, the fault will be generated
again.
FAULT RECOVERY Automatic when SMC auxiliary contact is detected as closed.
1. Defective Contactor.
2. Wiring fault from MEP to contactor coil.
PROBABLE CAUSES
3. Defective Digital input card.
4. Defective Digital output card.
1. Set the Display to ‘Manual Test for Outputs’ mode through Test
Mode Menu and satisfy the initial conditions required to run manual
test as prompted on the display unit. Press SMC CL press and
‘Enter’ key to test SMC contactor. Press ‘F1’ to energize SMC
contactor.
2. If SMC contactor is energized, then check the input status on the
digital input card.
a) If none of the LEDs is glowing, check the voltage between
wire No.51at SMC contactor Aux. Contact and locomotive 4
wire.
b) If the voltage is zero, check the continuity of wire 51 connect-
ing to SMC contactor Aux. Contact. If necessary, replace the
cable.
c) If voltage is more than 65V, check the voltage between wires
SMC FB at SMC contactor aux. contact and locomotive 4 wire.
d) If the voltage is zero, then Aux. Contact is faulty. Replace the
SMC contactor.
3. If the voltage is more than 65V,
a) Check the slackness of the connector at MEP cable. If slack,
tighten the connector.
b) Check the continuity of wire SMC FB from SMC contactor to
FAULT ISOLATION MEP cable. If necessary, replace the cable.
c) If Green LED is glowing and corresponding yellow LED is not
glowing, then the digital Input card is defective. Replace the
card
4. If the SMC contactor is not being energized as per the test
sequence, then check the voltage across the operating coil of the
SMC contactor and switch ON SMC contactor by pressing ‘F1/1’
key. If the voltage is more than 65V, then
a) SMC contactor operating coil is open circuited internally or
there may be a physical obstruction in the contactor operation.
Check and replace the SMC contactor, if necessary.
b) If the voltage is zero, then check the voltage on coil terminal
wire No. 51 and locomotive 4 wire.
c) If the voltage is zero, then check the continuity of wire loop 51
connected to SMC contactor operating coil. Identify and
replace wrong connections.’ menu option.
d) If the voltage is more than 65V, then negative feed is not
coming to SMC contactor operating coil.
e) Check the slackness of the digital output connector at MEP
control unit. If found slack, tighten the connector.
f) Check the continuity wires SMC CL from SMC coil to MEP
control unit. If wire is open, replace the cable.

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PARAMETER DESCRIPTION
g) Defective digital output card . Replace the card and checkup.
FAULT ISOLATION
Run ‘Auto test for Relays’ under ‘Test Mode’ menu option.
DISPLAY To DRIVER Yes

TE This fault will be logged only when “APU enabled” flag enabled as
NO set (√).

Ver2 Ver2A Ver3 Ver4

Applicable for
Yes Yes Yes Yes

PARAMETER DESCRIPTION
FAULT CODE 1287
APU Shut down Contactor circuit open.
Manually pull the Emergency Shut down Lever to shut down APU
FAULT MESSAGE
Engine. Run Auto/Manual Tests
Warning: FUEL SAVE mode prohibited.
RESTRICTIONS Fuel Save mode prohibit
ALARM BELL None
Low, Manual
RESET LEVEL
After manual reset if the fault is still present, the fault is generated again.
FAULT RECOVERY Automatic when fault is cleared

1. Defective shut down contactor.

2. Defective Unit
PROBABLE CAUSES 3. Wiring fault from MEP to shut down contactor coil.
4. Defective Digital input card
5. Defective Digital output card

This message is logged during cranking only.

1. Manually (apply 72V across coil) operate and check the free operation
of APU shut down contactor. Ensure that there is no mechanical
obstruction to operate. If contactor is not picking up, replace the ASC
contactor.
2. Ensure that both Green and Yellow LEDs on the digital input card are
glowing or not.
3. If the LED is not glowing:
a) Check the voltage at the feedback wire ASC FB at TB with
respective to 4.
FAULT ISOLATION b) If the supply voltage is more than 65V, and still the Green &
Yellow LEDs are not glowing, then the digital input card is
defective. Replace the card.
c) If the supply voltage is still zero, then wiring mistake. Identify
from where the supply is dropping.
d) Check the voltage at the feedback wire ASC FB at APU
TB-ASCFB with respective to 4. If voltage is more than 65V,
check the cable continuity and if required, replace the cable
from APU TB to TB.
e) If voltage is less than 3V, check the continuity between APU
TB to digital input connector and if required, replace the cable.

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Applicable for
Yes Yes Yes Yes

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PARAMETER DESCRIPTION
FAULT CODE 1292
FPC Contactor Stuck Closed
FAULT MESSAGE
Run Auto/ Manual Tests
RESTRICTIONS None
ALARM BELL None
Low, Auto
RESET LEVEL If the fault condition is still present when cleared manually, the fault will
be generated again.
FAULT RECOVERY Automatic when FPC auxiliary contact is detected as Low.
1. Defective FPC Contactor
PROBABLE CAUSES 2. Defective wiring.
3. Defective digital output card.
1. Shut down the engine. Switch ON MB1, MB2, MPCB, MFPB1, and
MFPB2 circuit breakers. Check the status of the FPC Contactor.
2. If FPC Contactor is in energized position, check the voltage across the
FPC Contactor coil terminals.
a) If the voltage is zero but Contactor is in picked up position, the
Contactor is defective. Replace the Contactor.
b) If the voltage is more than 65V, digital output card is defective.
Replace the card and check up.
c) If FPC Contactor is in de-energized position, check the input
status on the digital input card.
FAULT ISOLATION
d) If the green LED is glowing, disconnect the wire FPC FB from
the FPC Contactor interlock. Check the status of the Green LED.
◦ If the Green LED is still glowing, the wire FPC FB is shorted
with some positive wire in the bunch. Identify and remove
the short circuit.
◦ If the Green LED is OFF, then the FPC Contactor interlock
is faulty. Replace the FPC Contactor.
3. Run self test for the FPC Contactor to ensure the proper feedback
signal under ‘Auto test for relays’ in the ‘Test Mode’ menu available in
main menu.
DISPLAY To DRIVER Yes

TE This fault will be logged only when “APU enabled” flag enabled as
NO set (√).

Ver2 Ver2A Ver3 Ver4

Applicable for
Yes Yes Yes Yes

316 IM-203 rev 0

PARAMETER DESCRIPTION
FAULT CODE 1302
FAULT MESSAGE Low Water Switch input Low Or Water level Low, Check Water
RESTRICTIONS None
ALARM BELL Nil
Low, Manual
RESET LEVEL After manual reset if the fault is still present, the fault is generated
again.
FAULT RECOVERY None
1. LWS operated due to low water level.
PROBABLE CAUSES 2. Faulty micro switch, bellow, float, etc., in the LWS unit.
3. Any open circuit in LWS wiring from LWS to MEP.
1. Check the water level. If water is less, add water. Reset the fault.
2. If water is full, check the operation of LWS by operating the LWS
cock.
3. Check voltage at wire No. TO1 on backside TB. Observe for any
disconnected wires. If so, reconnect.
4. If voltage at wire No. TO1 is zero,
A) Check the voltage at wire No. 51 at backside TB. Observe
for any disconnected wires at the terminal. If so, reconnect.
B) If voltage is greater than 65V, either LWS wiring or LWS is
faulty.
FAULT ISOLATION 5. Check the wiring continuity of wire 51 from backside TB to LWS.
6. Check the wiring continuity of wire No. TO1 from LWS to backside
TB.
7. Check for any disconnected wires at LWS.
8. If wire continuity is proper, LWS micro switch is defective. Replace
and check.
9. If the voltage at back side TB on wire No. TO1 is greater than 65V,
10. Check the wiring continuity of wire No. TO1 from backside TB to
MEP by removing the coupler. If no continuity is there, replace
the cable.

DISPLAY TO DRIVER Yes

This fault will be logged only when “Engine water pressure

TE sensor connected” flag enables as set (√).
NO

Ver2 Ver2A Ver3 Ver4

Applicable for
NO Yes Yes Yes

322 IM-203 rev 0

Medha Servo Drives Pvt Ltd. MEP Troubleshooting Manual

PARAMETER DESCRIPTION
FAULT CODE 1303
FAULT MESSAGE Digital Air Flow Sensor Faulty.
RESTRICTIONS None
ALARM BELL Nil
Medium, Manual
RESET LEVEL
After manual reset if the fault is still present, the fault is generated again.
FAULT RECOVERY Automatic with sensor working.
1. Cable connector is slack at sensor/ uncoupled.
2. Cable connector is slack at ADB/ uncoupled.
3. Open circuit/ short with in the cable .
PROBABLE CAUSES
4. Cable connector is slack at control unit.
5. Sensor is defective.
6. Analog input card is defective.
This fault is logged only when digital air flow sensor is connected.
1. Check the tightness of the connectors of cable at both ADB and
sensor. If found slack, tighten the connector.
2. Check the wire continuity of the cable between pin to pin. If neces-
FAULT ISOLATION sary, replace the cable.
3. Check the tightness of the both connectors at both control unit and
ADB. If found slack, tighten the connector.
4. Replace the sensor and check.
5. Replace analog input card and check.
DISPLAY To DRIVER No

TE This fault will be logged only when “DFS Sensor connected”

NO flag enabled set (√).

Ver2 Ver2A Ver3 Ver4

328 IM-203 rev 0

Medha Servo Drives Pvt Ltd. MEP Troubleshooting Manual

PARAMETER DESCRIPTION
FAULT CODE 1312
FAULT MESSAGE Grid Blower Circuit or Sensor Cable Open.
RESTRICTIONS DB Prohibited and Self Load Box Prohibited.
ALARM BELL Nil
RESET LEVEL Low, Manual. If the fault still exists, the fault is logged again.
FAULT RECOVERY Automatic when the MCH is brought to IDLE.
1. Grid blower motor circuit is open circuited due to
A) Defective Blower motor
B) Cable open circuited.
PROBABLE CAUSES
C) Defective grids shorting busbar.
2. Defective cable between grid blower current sensor and ADB.
3. Defective Analog input card.
This fault is logged during dynamic braking/ self load test in locomo-
tives fitted with grid blower current sensor.

Set the loco to self load box through display unit. Open the notch to
Observe the blower rotation.
1. If the blower is not rotating and the blower current is also zero,
then the blower circuit is open. Check the following:
A) Check the blower motor connections at the dynamic braking
grids. If any of blower cables are disconnected, re-connect
the cables.
B) Remove one cable connection at the Grid. Check the
continuity of the blower motor between the two leads of the
blower motor.
FAULT ISOLATION
a) If there is no continuity, the blower is defective. Replace
the blower.
2. If the blower is rotating but the blower current displayed on the
display is zero, check the following:
A) Defective current sensor. Replace the current sensor and
check.
B) Defective Analog input card. Replace the card and check up.
C) Defective interconnecting cable between ADB and sensor.
If necessary, replace the cable.
D) Defective interconnecting cable between ADB and control
unit. Remove the connectors on both sides and check the
continuity of the cable pin to pin. If necessary, replace the
cable.
DISPLAY TO DRIVER Yes

TE This fault will be logged only when “GBLWI sensor connected” flag
NO enabled set (√).

Ver2 Ver2A Ver3 Ver4

Applicable for
No No YES YES

IM-203 rev 0 329

Ver2 Ver2A Ver3 Ver4

Applicable for
No No YES YES

IM-203 rev 0 335

Chapter 5 - Low Priority Faults Medha Servo Drives Pvt Ltd.

PARAMETER DESCRIPTION Chapter 5

FAULT CODE 1320
EDBC FB1 Circuit Open
FAULT MESSAGE

RESTRICTIONS
LOW PRIORITY FAULTS
Run Auto/ Manual Tests
None
ALARM BELL Nil
RESET LEVEL Low, Manual. If the fault still exists, the fault is logged once again.
FAULT RECOVERY Automatic when the EDBC1 FB is detected as closed.
51 wire loop coming to EDBC contactor normally open auxiliary
PROBABLE CAUSES
contacts is open circuited.
This fault is logged only when none of the normally open interlocks
are closed, when EDBR relay is energized. Ensure that all the
normally open interlocks are closing, when the EDBC contactors are
FAULT ISOLATION
operated.
Check the 51 wire loop connection at the normally open interlocks of
EDBC contactors. Identify the open circuited wires and reconnect.
DISPLAY TO DRIVER No

TE This fault will be logged only when “Extended DB enabled” flag

NO enabled set (√).

Ver2 Ver2A Ver3 Ver4

Applicable for
No No YES YES

336 IM-203 rev 0

Medha Servo Drives Pvt Ltd. MEP Troubleshooting Manual

PARAMETER DESCRIPTION
FAULT CODE 1321
EDBC FB2 Circuit Open
FAULT MESSAGE
Run Auto/ Manual Tests
RESTRICTIONS None
ALARM BELL Nil
RESET LEVEL Low, Manual. If the fault still exists, the fault is logged once again.
FAULT RECOVERY Automatic when the EDBC2 FB is detected as closed.
51 wire loop coming to EDBC contactor normally open auxiliary
PROBABLE CAUSES
contacts is open circuited.
This fault is logged only when none of the normally open inter-
locks are closed, when EDBR relay is energized. Ensure that all
the normally open interlocks are closing, when the EDBC con-
FAULT ISOLATION tactors are operated.
Check the 51 wire loop connection at the normally open inter-
locks of EDBC contactors. Identify the open circuited wires and
reconnect.
DISPLAY TO DRIVER No

Chapter 5 - Low Priority Faults Medha Servo Drives Pvt Ltd.

PARAMETER DESCRIPTION
FAULT CODE 1328
FAULT MESSAGE Fuel Level Sensor 2 Faulty
RESTRICTIONS None
ALARM BELL Nil
Medium, Auto.
RESET LEVEL
If fault still exists, again fault is logged.
FAULT RECOVERY Automatic when fuel oil level sensor is detected working..
1. Fuel level Sensor 2 Faulty
2. Defective cables
PROBABLE CAUSES
3. Defective ADB
4. Defective Analog input card.
1. Compare the actual fuel oil level with the displayed value.
2. If the difference is excess, replace the sensor and check up.
3. If the fault is still logging,
a) Slackness of the connectors either at the sensor or at the
ADB. Tighten both connectors at the sensor and at ADB.
b) Defective interconnecting cable between sensor and ADB.
Replace the cable and check up.
FAULT ISOLATION
c) Slackness of the connectors either at ADB or MEP control
unit. Tighten both cable connectors ADB and MEP control
unit
d) Defective interconnecting cable between ADB and MEP
control unit.
e) Defective ADB. Replace ADB and check.
f) Defective Analog input card. Replace the card and check up.
DISPLAY TO DRIVER Yes

TE This fault will be logged only when “FOL 2 Sensor connected” flag
NO enabled as set (√).

Ver2 Ver2A Ver3 Ver4

Applicable for
No YES YES YES

344 IM-203 rev 0

Medha Servo Drives Pvt Ltd. MEP Troubleshooting Manual

PARAMETER DESCRIPTION
FAULT CODE 1344
FAULT MESSAGE Cam Gear Tooth for ESS1 may be broken or Profile may be irregular
RESTRICTIONS None
ALARM BELL None
Medium, Manual
Manual fault clearing through keyboard on the display unit.
RESET LEVEL
(If the fault condition is still present when cleared manually, the fault
will be generated again.)
FAULT RECOVERY Nil
PROBABLE CAUSES Defective cam gear.
1. Reset the fault manually.
FAULT ISOLATION 2. Check the CAM Gear for any cam gear teeth broken or par-
tially damaged. Then replace the CAM gear.
DISPLAY TO DRIVER Yes

TE This fault will be logged only when “Cam tooth missing fault log
NO enable” flag enabled as set (√).

Ver2 Ver2A Ver3 Ver4

Applicable for
No No YES YES

PARAMETER DESCRIPTION
FAULT CODE 1345
FAULT MESSAGE Cam Gear Tooth for ESS2 may be broken or Profile may be irregular
RESTRICTIONS None
ALARM BELL None
Medium, Manual
Manual fault clearing through keyboard on the display unit.
RESET LEVEL
(If the fault condition is still present when cleared manually, the fault
will be generated again.)
FAULT RECOVERY Nil
PROBABLE CAUSES Defective cam gear.
1. Reset the fault manually.
FAULT ISOLATION 2. Check the CAM Gear for any cam gear teeth broken or partially
damaged. Then replace the CAM gear.
DISPLAY TO DRIVER Yes

TE This fault will be logged only when “Cam tooth missing fault log
NO enable” flag enabled as set (√).

Ver2 Ver2A Ver3 Ver4

Applicable for
No No YES YES

IM-203 rev 0 357

Chapter 5 - Low Priority Faults Medha Servo Drives Pvt Ltd.

PARAMETER DESCRIPTION
FAULT CODE 1410
FAULT MESSAGE Abnormal Air Leakages. Suspected Train Parting or Alarm Chain Pulling
RESTRICTIONS None
ALARM BELL Nil
RESET LEVEL None
FAULT RECOVERY None
PROBABLE CAUSES None
FAULT ISOLATION This is an informative message.
DISPLAY TO DRIVER Yes

Ver2 Ver2A Ver3 Ver4

Applicable for
No No YES No

PARAMETER DESCRIPTION
FAULT CODE 1778
FAULT MESSAGE Data Freeze/ SOS Button pressed
RESTRICTIONS None
ALARM BELL None
RESET LEVEL None
FAULT RECOVERY None
PROBABLE CAUSES None
This is an informative message. A set of data pack parameters are
FAULT ISOLATION
recorded when the Data Freeze/ SOS Input is High.
DISPLAY TO DRIVER Yes

TE This fault will be logged only when “Data Freeze input connected”flag
NO enabled as set (√).

Ver2 Ver2A Ver3 Ver4

Applicable for
No No YES YES

358 IM-203 rev 0

Medha Servo Drives Pvt Ltd. MEP Troubleshooting Manual

PARAMETER DESCRIPTION
FAULT CODE 2570
FAULT MESSAGE Communication link to Display Unit failed.
RESTRICTIONS None
ALARM BELL Nil
RESET LEVEL None
FAULT RECOVERY None
Serial Communication Link between Main Control unit and Display
PROBABLE CAUSES
unit has failed..
Manual fault clearing through Laptop/ PC only.
As the communication has failed the fault can't be cleared from
Display unit.
FAULT ISOLATION
As and when the communication works, parameter display starts and
performance of Display Unit be normal, even though the fault is not
cleared.
DISPLAY TO DRIVER Yes

Ver2 Ver2A Ver3 Ver4

Applicable for
Yes Yes YES YES

PARAMETER DESCRIPTION
FAULT CODE 2577
FAULT MESSAGE New memory card loaded for event recording
RESTRICTIONS None
ALARM BELL Nil
RESET LEVEL None
FAULT RECOVERY None
PROBABLE CAUSES None
FAULT ISOLATION This is an informative message.
DISPLAY TO DRIVER Yes

Ver2 Ver2A Ver3 Ver4

Applicable for
Yes Yes YES YES

IM-203 rev 0 359

Ver2 Ver2A Ver3 Ver4

Applicable for
No Yes YES YES

PARAMETER DESCRIPTION
FAULT CODE 2590
FAULT MESSAGE Communication Link to Display unit is OK now
RESTRICTIONS None
ALARM BELL Nil
RESET LEVEL None
FAULT RECOVERY None
PROBABLE CAUSES None
FAULT ISOLATION Informative message.
DISPLAY TO DRIVER No

Ver2 Ver2A Ver3 Ver4

Applicable for
No Yes YES YES

362 IM-203 rev 0

IM-203 rev 0 367

Chapter 5 - Low Priority Faults Medha Servo Drives Pvt Ltd.

PARAMETER DESCRIPTION
FAULT CODE 2699
FAULT MESSAGE Power ground power de-ration started.
RESTRICTIONS None
ALARM BELL Nil
RESET LEVEL None
FAULT RECOVERY None
PROBABLE CAUSES None
FAULT ISOLATION Informative message
DISPLAY TO DRIVER No

Chapter 6

ONLY ERROR LOG MESSAGES

PARAMETER DESCRIPTION
FAULT CODE 6065
FAULT MESSAGE MAIP1-LCC Both Channel Communication Faulty
RESTRICTIONS None
ALARM BELL 30
High, Manual.
RESET LEVEL If the fault condition is still present when cleared manually, the fault
is generated again.
Automatic when the communication between MAIP1 and LCC card is
FAULT RECOVERY
established.
● Loose contact/ Improper insertion of the MAIP1 card.
PROBABLE CAUSES
● MAIP1 card may be faulty.
● LCC card may be faulty.
1. Check the tightness of the cards in MEP system, if found
loose tighten the same and check.
FAULT ISOLATION
2. Replace the MAIP1 card and check.
3. Replace the LCC card and check.
DISPLAY TO DRIVER Yes

Ver 2 Ver 2A Ver 3 Ver 4

TYPE MEP
FOR INDIAN RAILWAYS

Medha Servo Drives Pvt. Ltd.

P- 4/5 B, I.D.A., Nacharam, Hyderabad - 500076. India.
www.medhaindia.com

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