Overheat Pre-Alarm
Yaskawa · E7 Drive
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.
Complete Troubleshooting Guide
- 1
Inspect the drive's cooling fins and fan for obstructions, dust accumulation, or proper operation. Clean if necessary.
- 2
Confirm the ambient temperature around the drive is within its specified operating range, and review parameter L8-12.
- 3
Check the drive's cooling fan operation selection (L8-10) and ensure it's functioning as expected.
- 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.