
MEP 660 - Trouble shooting Manual
Doc No.: IM – 51
Rev.2.0
Print: October 2008
78
PARAMETER
DESCRIPTION
FAULT CODE
1075
FAULT MESSAGE Field Shunting Relay FSR circuit open.
RESTRICTIONS
Motoring with field shunting and Motoring in parallel prohibited.
ALARM BELL
30 seconds
RESET LEVEL
Medium, Manual
After manual reset if the fault still present, the fault will be generated
again.
FAULT
RECOVERY
Automatic when the master handle is brought to IDLE. Automatic reset
is permitted for 3 times after which manual reset is required.
PROBABLE
CAUSES
1. Defective FSR relay.
2. Defective digital output card
3. Defective wiring of FS contactor feed back.
4. Defective digital input card.
FAULT
ISOLATION
1. Set the display mode to ‘Manual Test for outputs’ under Test Mode
menu.
2. Enter 24 and press ‘Enter’ key to test the FSR operation.
3. Press ‘1’ key to switch on FSR relay.
4. FSR relay should pickup and along with that FS contactors also
should pick up.
5. If FSR relay 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.
6. If voltage is zero, check voltage at FSR coil terminal (Wire No. 13)
with respect to locomotive 4 wire with a voltmeter.
A. If voltage is zero, check the continuity of 13-wire loop
connected to FSR relay. Check and replaced the open circuited
wires.
7. If Voltage is more than 65V, check the voltage between Locomotive
13 wire and wire FSRCL at FSR relay coil terminal.
A. If the voltage is zero:
a) Check slackness of connector of cable ID: AZ at MEP660
control unit. If slack tighten the connector.
b) Check continuity of FSRCL wire from FSR coil terminal to MEP-
660 (Cable ID: AZ, Pin-J). If necessary replace the cable.
c) If continuity is available, the digital output card 2 in slot No.
15 is defective. Replace the card and recheck.
8. 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 13-wire supply at FSR relay interlocks. Check up
continuity of 13-wire loop. Replace any open circuited wires.
9. If FS contactors are picking up:
10. Check the status of Green LED 10 on the Digital input card in slot
No. 12. The LED should glow.
11. If the Green LED 10 is 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.
12. If voltage is more than 65V, Check the voltage at FS contactor
auxiliary contact (wire No. FSFB) with respective locomotive 4 wire.