
MEP 660 - Trouble shooting Manual
Doc No.: IM – 51
Rev.2.0
Print: October 2008
77
PARAMETER
DESCRIPTION
FAULT CODE
1074
FAULT MESSAGE Field Shunting Relay FSR or FS Contactor FS2X Stuck Closed.
RESTRICTIONS
Motoring always with field shunting. Motoring in parallel prohibited.
ALARM BELL
30 seconds
RESET LEVEL
Low, Manual
After manual reset if the fault still present, the fault will be generated
again.
FAULT
RECOVERY
Automatic when the stuck closed relay/contactor is detected as open.
PROBABLE
CAUSES
1. Welded FS contactors.
2. Defective FSR Relay
3. Defective wiring.
4. Defective output card.
FAULT
ISOLATION
1. Check the status of Green LED 10 and yellow LED 10 on the digital
input card in slot 12.
2. If both the LEDs are glowing, check the status of FSR relay.
A. If FSR is energized,
a) Check the condition of FSR relay for any dislocated springs. If
necessary change the relay.
b) The digital output card in slot 15 might be defective. Replace
the card.
3. If FSR is in de-energised position, check FS contactors for any
welded contact tips. If found welded contactors, separate the tips
and clean them. The LEDs should be OFF.
4. If still LEDs are glowing, FSFB wire is getting wrongly supply due to
wrong wiring / shorted wiring. Identify and rectify.
5. If both the LEDs are not glowing but the fault is logged, check
operation of FS contactors for proper operation. Delayed dropout of
any FS contactor can log this fault and later on it is recovered.
Note: This Error message will be generated only if either “Series Field Shunting” or
“Parallel Field Shunting” ENABLED flags are set (
√
).