62-11389
7−63
Alarm
NO.
Steps Alarm/Cause Corrective Action
100 OVERLOAD/GROUND FAULT
• TRIGGER–ON: Engine or Standby Operation is being called for and the overload ground fault
module is reading more than 40 Amps on any A/C current leg OR there is A/C voltage leaking to
ground of more than 150 miliamps.
• UNIT CONTROL: Engine Operation: engine and unit shutdown and alarm.
Standby Operation: refrigeration system shutdown and alarm.
• RESET CONDITION: Auto Reset in Engine Operation. Alarm may be manually reset via Keypad or,
alarm may be reset by turning the unit off, then back on again.
NOTE: Follow the steps below until a problem is found. Once a repair or correction has been made, the active
alarm should clear itself (see reset condition above). Operate the unit through the appropriate modes to see if
any active alarm occurs. Continue with the steps below as necessary.
1 Check (Overload Ground Fault Detector (OGF) LED
Check status LED LED is On - Ground Fault is detected. Start with Step
3 below.
LED is Off - Circuit Overload is detected. Start with
Step 2 below.
2 Check For Electrical Overload
Check high voltage amp draw from
GENCON if running in Engine Oper-
ation or PSCON2 if running in
standby Operation.
Must be less than 40 Amps.
3 Check For High Voltage Short To Ground
a. Check resistance between T1, T2
and T3 for ALL High voltage
contactors to ground.
Reading must be greater than 25,000 Ohms.
b. Perform Megohmmeter test on all
high voltage circuits.
See Section 8.9.
4 Perform Pretrip Check
a. Clear Active Alarm list, then run
Pretrip & check for any new alarms.
Note during which test Alarm 100 occurs.
b. Further test circuit from Step a.
above.
Use a megohmmeter to test.
5 Check Overload / Ground Fault Device
With the engine OFF and standby
power disconnected, start the unit in
Engine Operation.
Must have 12 VDC at HC19 and 2MP26.
Refer to Section 8.9.4 for checking OGF.
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