MOTOR PHASE LOSS

What does OPF mean?

This fault indicates a loss of one or more phases at the drive output, often due to an open output contactor, a disconnected motor, or a motor with insufficient power. It can also be triggered by instantaneous instability in the motor current. If not addressed, the motor will operate inefficiently or fail to run, potentially leading to motor winding damage due to unbalanced currents.

Additional Steps

Steps 1–2 are listed in Priority Fix.

1. 3

   For testing purposes on a low-power motor or without a motor, temporarily deactivate motor phase loss detection by setting [Output Phase Loss] (OPL) to [No] (nO). Remember to reactivate for normal operation.

2. 4

   Check and optimize motor control parameters such as [IR compensation] (UFr), [Rated motor volt.] (UnS), and [Rated mot. current] (nCr), and perform an [Auto tuning] (tUn) operation (page 43).