Output Phase Loss Fault

What does EPH0 mean?

This fault is detected when one or more output phases to the motor are lost, leading to an imbalance or interruption in motor current from the Altivar 212 drive. This can severely affect motor operation and cause damage.

• Loss of one or more output phases.
• Bad connection in the output circuit (U, V, W terminals).
• Output disconnect has opened.
• Open winding in the motor.

Click steps to track your progress.

1. 1

   Inspect motor cable connections at the drive's output terminals (U/T1, V/T2, W/T3) for tightness and continuity.

2. 2

   Measure the resistance of motor windings to identify an open circuit.

3. 3

   Verify the status of any output disconnect devices (e.g., motor contactor).

4. 4

   Check parameter F605 ([Output phase loss]) setting.