Earth fault

What does 3 mean?

The current measurement system has detected an excessive leakage current to ground during startup. This is a strong indication of an insulation failure, either in the motor cables connecting the drive to the motor or within the motor windings themselves.

• High resistance between motor phases and ground.
• Insulation failure in motor windings or cables.
• Faulty converter output stage to ground.
• Humidity or contamination on motor or cables.
• Incorrect grounding of the motor or system.

Click steps to track your progress.

1. 1

   Inspect all motor cables for any signs of damage or compromised insulation.

2. 2

   Perform an insulation resistance test (megger test) on the motor cables and motor windings to ground and between phases, expecting resistance values greater than 1 MΩ.