Load Bank Troubleshooting

Cooling fan motor will not operate

1. Inoperative fan circuit breaker
2. Fan/control power not available and/or incorrect
3. Inoperative fan motor
4. Fan motor contactor de-energized
5. Restriction of air (intake or exhaust)
6. Fan pressure switch inoperative
7. Inoperative Voltage Sensing Relay (VSR), Load Voltage Contactor (LVC), and/or Load Contactor Relay (LCR) (Digital Load Banks only)

Cooling failure indicated

Exhaust temperature above EXTS setpoint:

1. Over temperature sensor failure
2. Fan failure
3. Air restriction (intake or exhaust)
4. Overvoltage condition present

Exhaust temperature below EXTS setpoint:

1. Restriction of air (intake or exhaust)
2. Fan pressure switch inoperative
3. Over temperature sensor failure

Test meters do not operate properly

1. Meter voltage switch failure
2. Meter multiplier resistor inoperative
3. Improper positioning of meter voltage selector switch
4. Current transformer or current transformer wiring failure
5. Test meter failure
6. Meter fuses open

Some load steps cannot be energized

1. Inoperative load step switches
2. Open load step resistor(s)
3. Inoperative load step relays
4. Inoperative load step contactors
5. Open load step fuses

Load Over Voltage Indicated

1. Load Voltage incorrectly selected on the Maintenance Mode Screen (Digital Load Banks only)