LOFA EP250 Operation and Troubleshooting
14
463-3000-01 Rev C.1 - 28-Feb-2007
Control System Troubleshooting
Control system does not perform self test
Possible Cause
Possible Remedy
Tripped overcurrent protection
Correct fault, replace or reset overcurrent protection
Faulty connection to battery
Correct battery connections (see Battery Circuit Requirements above)
Control system performs normal self test, engine cranks, runs and shuts down
Possible Cause
Possible Remedy
Only Battery LED illuminated
Correct battery charge failure (see Battery not charging above)
Only Oil Pressure LED
Illuminated
Correct low oil pressure condition or faulty switch, correct wiring fault
Only Temperature LED
Illuminated
Correct overheating condition or faulty switch, correct wiring fault
Only Aux LED Illuminated
Correct fault condition (i.e. v-belt, coolant level) or faulty switch, correct
wiring fault
All normally closed shutdowns
illuminate for one second
(control system reset)
Add suppressor diodes, protect from nearby lightening strikes, shield
induced spikes from other equipment, add electric motor control relay
Testing Shutdown Inputs
Shutdown switches signal a fault by ground contact in most systems. Shutdown operation can be verified by
grounding the shutdown inputs individually. It may be necessary to remove the wire from the shutdown
switch to perform this test.
Note
Most shutdown switches are grounded through the switch body.
Do not use insulating sealant (i.e. Teflon tape) when installing switches.
Some thermostat housings are composites and do not provide ground for the switch.
Revision History
Initial Release.
Rev A – 22-May-2006. Corrected typographical errors.
Rev B – 26-Oct-2006. Add symbols to
Indicators
, corrected typographical errors.
Rev C – 8-Jan-2007. Updated schematics, removed Power Box information.
Rev C.1 – 28-Feb-2007. Added part numbers.