Overheat Pre-Alarm

What does OH mean?

The Overheat (OH) Pre-Alarm indicates that the drive's cooling fin temperature has exceeded the threshold set in parameter L8-02. Depending on the setting of L8-03, this condition can either trigger a fault detection (with the fault contact activating) or function as an alarm only. Ignoring this pre-alarm can lead to a more severe overheat fault (like OH1) and potential damage to the drive if the temperature continues to rise.

Additional Steps

Steps 1–2 are listed in Priority Fix.

1. 3

   Check the drive's cooling fan operation selection (L8-10) and ensure it's functioning as expected.

2. 4

   Adjust L8-02 (Overheat Pre-Alarm Level) or L8-03 (Operation Selection) if the current settings are too sensitive or inappropriate for the environment.