
MEP 660 - Trouble shooting Manual
Doc No.: IM – 51
Rev.2.0
Print: October 2008
32
PARAMETER
DESCRIPTION
FAULT CODE
1025
FAULT MESSAGE Alternator Output Voltage High FAULT
RESTRICTIONS
Motoring and Dynamic Brake Prohibited
ALARM BELL
30 Sec.
RESET LEVEL
Medium, Manual
After manual reset if the fault still present, the fault will be generated
again.
FAULT
RECOVERY
Autometic when Traction Alternator Voltage is reduced below 100V and
Master Handle is brought to IDLE. Auto recovery is permitted for 3
times in one hour. There after Manual reset is required.
PROBABLE
CAUSES
1. Momentarily the Traction Alternator Voltage might have shooted up
2. Some wiring short circuit has occurred in FCP and Exciter field
circuit.
FAULT
ISOLATION
1. Connect a DC voltameter 0 to 1000V range between GA11 and GA2.
2. Crank the engine and ensure loco brakes are applied.
3. Press the following keys on the display unit in the same sequence to
set the display mode to “Load Box Test” under Test mode menu.
‘Menu’ + 3 + (pass code) + 1 + 1 +’Enter’.
4. Move the master Hnadle 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 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 FCP1 (EFR1, 2, 3 and 4). Check for
any disconnected / short-circuited / over heated wire terminals
at the FCP1. Check and rectify.
B. Check wiring connections at wire terminals 61G and 61GA on
the backside TB for any disconnected / short-circuited / over
heated terminals. Check and rectify.
9. If both the voltages are equal and with in limits, then the fault is a
transient.