Heatsink overtemperature (C0122)

What does OH4 mean?

The heatsink temperature has exceeded the threshold set in C0122. Causes include ambient temperatures above +40°C or +50°C, a dirty heatsink, an incorrect mounting position, or the value specified under C0122 being set too low.

• Heatsink temperature (C0122) has exceeded its critical limit, potentially leading to power module failure.
• Inadequate airflow or blocked heatsink fins on the drive's power module.
• High ambient temperature combined with heavy drive load.
• Cooling fan for the heatsink is not functioning.

Click steps to track your progress.

1. 1

   Allow the module to cool and ensure better ventilation within the control cabinet.

2. 2

   Check the ambient temperature in the control cabinet.

3. 3

   Clean the heatsink if it is very dirty to improve heat dissipation.

4. 4

   Change the mounting position if it is hindering airflow.

5. 5

   Enter a higher value under C0122 if the threshold is set too low.

6. 6

   Switch off monitoring by setting C0582 = 3.