Overload / Ground Fault
engine
Description
An overload or ground fault is detected, and the unit shuts down and alarms or shuts down the refrigeration system and alarms.
Activation Conditions
Engine or Electric 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 Behavior
Engine Operation: Engine and unit shutdown and alarm. Electric Operation: Refrigeration system shutdown and alarm.
Reset Conditions
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.
Corrective Actions
1. Check Overload Ground Fault Detector (OGF) 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 8.9.7 2. Check for Electrical Overload - Check high voltage amp draw from GENCON if running in Engine Operation or PSCON2 if running in Electric 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 Meg-ohmmeter test on all high voltage circuits. See Section 8.9. 4. Perform Pretrip Check a. Clear Active Alarm list, then run Pretrip and check for any new alarms. Note during which test Alarm 00100 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 OGF +12V and S+. Must have good ground at OGF 0V.