
MEP 660 - Trouble shooting Manual
Doc No.: IM – 51
Rev.2.0
Print: October 2008
15
PARAMETER
DESCRIPTION
FAULT CODE
1012
FAULT MESSAGE Locked Axle on Wheel Number 4
RESTRICTIONS
Motoring and Dynamic Brake Prohibited.
ALARM BELL
As long as Loco moves and for 30 Seconds minimum.
RESET LEVEL
Low, Manual
After manual reset if the fault still present, the fault will be generated
again.
FAULT
RECOVERY
No auto recovery.
PROBABLE
CAUSES
1. There may be a physical locked axle.
2. Traction Motor speed sensor is faulty.
3. The speed signal gear assembly worked out from the Traction
Motor Armature shaft.
FAULT
ISOLATION
1. If there is physically locked axle, act according to Rail Road rules
and regulations.
2. If the axle is not locked physically,
A. Reset the fault manually. Set the display mode to ‘Wheel Slip
Display Mode’ under Display Menu. Open the notch to 1 in
motoring and slowly release the brakes.
B. Observe the individual Traction Motor speeds and currents on
the display.
C. If the currents of all Traction Motor are with in limits, and speed
of Traction Motor No.4 is zero / less, MEP-660 is not getting
proper speed signal from Traction Motor No.4.
D. Stop the locomotive and
a) Check for any cable disconnection in the No.4 Traction Motor
Armature speed sensor circuit. Replace / reconnect the cable.
b) Check for any dislocation of the speed sensor on the end
shield of Traction Motor 4. Reconnect the sensor properly.
c) Remove the end shield of Traction motor No.4 and check for
dislocation of sensor gear on the shaft. If so replace the Tr.
Motor / refit the sensor gear properly.