Motor Phase Failure
Schneider Electric · Altivar Machine ATV340 Programming
What does -OPF mean?
This fault indicates a loss of one or more phases at the output of the drive controller, meaning the motor is not receiving power on all its windings. This can be caused by loose motor connections, a damaged motor cable, or if the drive is significantly oversized for a small motor (making phase loss harder to detect). Operating with a missing motor phase will cause excessive heating and damage to the motor windings and potentially the drive.
Additional Steps
Steps 1–2 are listed in Priority Fix.
- 3
If the drive is significantly oversized for the motor, consider disabling the OPL (Motor Phase Failure Detection) parameter (see page 65) and installing an external motor overload protection device directly at the motor.