Heatsink Overtemperature

What does OH mean?

The controller's heatsink temperature has exceeded its safe operating limit (either >85°C or >80°C), typically due to high ambient temperature, blocked airflow, or excessive drive load. A dirty heatsink or high currents during acceleration can also contribute. Sustained overtemperature will lead to derating, thermal shutdown, and reduced component lifespan.

• High ambient temperature surrounding the drive exceeding its specified operating limit (e.g., >40°C).
• Blocked or restricted airflow to the heatsink fins due to dust, debris, or improper enclosure design.
• Cooling fan failure (e.g., FAn1 fault not yet triggered) reducing heat dissipation.
• Excessive drive load leading to sustained high current output, generating more heat.
• Dirty heatsink fins restricting heat transfer from the power modules.

Click steps to track your progress.

1. 1

   1. Measure the ambient temperature immediately surrounding the drive and ensure it is within the drive's specified operating range.

2. 2

   2. Disconnect mains power and clean the heatsink fins thoroughly with compressed air to remove dust and debris.

3. 3

   3. Verify the operation of all cooling fans within the drive by observing rotation and airflow once power is restored.

4. 4

   4. Ensure proper ventilation within the electrical enclosure, checking for blocked vents or insufficient spacing around the drive.

5. 5

   5. Monitor the drive's output current (e.g., C0004) to confirm it is within the drive's nominal rating for continuous operation.