Drive Controller Overload / Overheat

What does -OHF mean?

This fault indicates that the drive controller's internal temperature has exceeded its safe operating limits, often due to sustained high motor current or insufficient cooling. This protects the drive's power components from thermal damage. The fault is triggered when the drive controller's thermal state estimate reaches 118%, necessitating a cooldown period.

Additional Steps

Steps 1–2 are listed in Priority Fix.

1. 3

   Verify the ambient temperature around the drive controller is within the manufacturer's specified range. Improve cabinet ventilation if necessary. Allow the drive to cool down completely before attempting a restart.