Earth (ground) fault

What does 14 mean?

A discharge of current from one or more output phases to ground has been detected, indicating an insulation breakdown. This fault can occur either in the motor cables connecting the drive to the motor or within the motor windings themselves. This is a critical safety fault posing an electrical shock hazard and potentially leading to severe damage to the frequency converter and motor if not promptly addressed.

Additional Steps

Steps 1–2 are listed in Priority Fix.

1. 3

   Using a megohmmeter (insulation resistance tester), measure the insulation resistance between each motor phase (U, V, W) and earth, both for the motor cables and the motor windings. Expect readings greater than 1 MΩ.

2. 4

   Identify whether the fault is in the motor cables (replace/repair) or the motor (replace/rewind). Do not re-energize until the fault is completely removed.