
MEP 660 - Trouble shooting Manual
Doc No.: IM – 51
Rev.2.0
Print: October 2008
7
PARAMETER
DESCRIPTION
FAULT CODE
1004
FAULT MESSAGE LLOB trip. Reset Plunger.
RESTRICTIONS
Cranking Prohibited
ALARM BELL
Continuous ON
RESET LEVEL
Medium, Manual
After manual reset if the fault still present, the fault will be generated
again.
FAULT
RECOVERY
Autometic when the fault is cleared and 20 seconds of time is lapsed.
PROBABLE
CAUSES
1. Low Lube Oil Button might have tripped in the Woodward governor.
Or
2. The feedback input wire OPSFB is getting wrong supply.
FAULT
ISOLATION
1. Check the Low Lube Oil Button position on the Woodward governor.
2. If tripped (projecting outside),
A. Press the button inside to reset.
B. Reset the Fault manually and crank the engine.
3. If LLOB is not in tripped position
A. Pull the knob outside and reset once again.
B. Check the OPS (LLOB) feed back signal level with Number 5
Green and Yellow LEDs on Digital Input card MDIP-16 in 11
th
slot.
With LLOB in normal position, both LEDs are OFF.
With LLOB in tripped position, both LEDs are ON.
C. If both LEDs are ON with LLOB in normal position
a) Check voltage at wire No. 1B at the back side TB.
b) If voltage is > 65V
c) Disconnect the wires 1B and identify which wire is getting
supply.
d) If the wire is from governor amphonal plug, then the micro
switch in the Governor is shorted. Replace the micro switch.
e) If the wire is from loco side, there may be a wrong feed back
from indication panel side. Check up and isolate the supply.
Note: Most probably this fault is accompanied with a Fault message
‘LLOB Trip. Reset Plunger’ (Fault code 1005). Driver might have reset
the fault on the display with out reseting the LLOB on the Governor.