Power unit: Ground fault

What does F30021 mean?

The power unit has detected a ground fault in the output circuit. This can originate from insulation breakdown in the power cables or motor windings, a defective current transformer (CT), or even a specific issue related to the brake application. An unresolved ground fault poses a severe risk of electric shock, equipment damage, and fire.

Additional Steps

Steps 1–2 are listed in Priority Fix.

1. 3

   Check the current transformer (CT) for proper function and calibration.

2. 4

   Examine the brake connection cables and contacts for wire breaks or poor connections if applicable.