
MEP 660 - Trouble shooting Manual
Doc No.: IM – 51
Rev.2.0
Print: October 2008
5
PARAMETER
DESCRIPTION
FAULT CODE
1002
FAULT MESSAGE Engine Over Speed.
RESTRICTIONS
Engine Shutdown
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 engine is not running and Master Handle is kept in
IDLE position for 10 secconds.
PROBABLE
CAUSES
1. Faulty wiring from tacho generator to MEP-660
2. Faulty Tacho generator
3. Faulty governor / sticky racks
FAULT
ISOLATION
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 with in limits.
B. If the displayed RPM is correct
a) Check up with tacho generator wiring from tacho generator
terminal board to backside TB to MEP-660 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 hevy fluctaution is
noticed, check for tacho generator and replace.