Soft Charge Circuit Fault

What does UV3 mean?

The pre-charge contactor opened while the Drive was running, indicating a problem with the soft charge circuit. This is often caused by dirty contacts on the soft charge contactor, preventing it from functioning mechanically, and can lead to immediate shutdown and failure to start.

Additional Steps

Steps 1–2 are listed in Priority Fix.

1. 3

   Repair or replace the Power PCB/Gate Drive PCB if the fault persists after inspecting and cleaning/replacing the contactor, as the issue may lie in the control circuit.