Diagnostics & Troubleshooting 6 - 14Table 6.2 Alarm Displays and Processing (continued)DigitalOperator Display Description Cause Corrective ActionUV2CTL PS UndervoltControl Power Supply UndervoltageUndervoltage of the control circuit whenrunning.External load was pulling downthe Drive’s power supplies, orthere was an internal short in thepower/gate Drive board.Cycle power to the Drive.Repair or replace the Power PCB/Gate Drive PCB.Remove all control wiring andtest Drive.UV3MC AnswerbackSoft Charge Circuit FaultThe pre-charge contactor opened while theDrive was running.Contacts on the soft chargecontactor were dirty and the softcharge contactor does notfunction mechanically.Cycle power to the Drive.Check the condition of the softcharge contactor.Repair or replace the Power PCB/Gate Drive PCB.
