Phase W to Gnd

What does F040 mean?

A ground fault has been detected specifically on the W-phase output between the drive and the motor. This points to insulation failure in the W-phase motor winding or its connecting cable, creating an unwanted current path to earth ground. This is a severe electrical safety hazard and can cause significant equipment damage.

Additional Steps

Steps 1–2 are listed in Priority Fix.

1. 3

   If the motor and cable test clear, but the fault persists, replace the drive as an internal W-phase ground fault may be present.