Output Phase Loss

What does 21 mean?

Current in one or more output phases has been lost or remains below a preset level. This indicates an open circuit condition between the drive and the motor, or a motor winding issue, which can lead to motor overheating or unstable operation.

• One of the motor phases (U, V, or W) is not detected at the drive output.
• Open circuit in motor power cable or motor winding.
• Faulty output contactor or relay.
• Internal drive output stage failure.

Click steps to track your progress.

1. 1

   Check the drive and motor wiring for loose connections or breaks.

2. 2

   Check for phase-to-phase continuity at the motor terminals using a multimeter.

3. 3

   Check for disconnected motor leads.