62-11785 7–32
00100 OVERLOAD/GROUND FAULT
• ACTIVATION: Unit 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 Milli-
amps.
• UNIT CONTROL: Shutdown and alarm.
• RESET CONDITION: 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.
CORRECTIVE ACTIONS:
1. Check Overload Ground Fault Detector (OGF) Detector LED
• If LED is On - Ground Fault is detected. Start with Step 3 below.
• If LED is Off - Circuit Overload is detected. Start with Step 2 below. Refer to Section 8.8.8.
2. Check For Electrical Overload - Check high voltage amp draw from PSCON/PSCON2. 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 Meg-ohmmeter test on all high voltage circuits. See Section 8.8.6.
4. Perform Pretrip Check
a. Clear Active Alarm list, then run Pretrip & check for any new alarms. Note during which test Alarm
00100 occurs.
b. Further test circuit from Step a. above. Use a meg-ohmmeter to test.
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