Heatsink Overheat

What does oH mean?

The temperature of the drive's heatsink has exceeded the pre-alarm level, typically set between 90-100 °C by parameter L8-02. This condition can be caused by high ambient temperatures, a malfunctioning internal cooling fan, or restricted airflow around the drive, leading to inadequate heat dissipation and potential damage to internal power components if ignored.

• Clogged or dirty heatsink cooling fins preventing effective heat dissipation.
• Malfunctioning or failed heatsink cooling fan, leading to reduced airflow.
• Ambient temperature exceeding the drive's specified operating range (e.g., above 50°C).
• Excessive drive loading causing prolonged high current output, exceeding thermal capacity.
• Incorrect mounting or insufficient clearance (e.g., less than 100mm top/bottom) around the drive.

Click steps to track your progress.

1. 1

   Measure the ambient temperature near the drive using a calibrated thermometer; ensure it is within specified limits.

2. 2

   Inspect the heatsink cooling fins for dust, debris, or obstructions; clean thoroughly using compressed air.

3. 3

   Verify the operation of the heatsink cooling fan; check if it spins freely and measure its current if possible.

4. 4

   Check parameter L8-02 (Heatsink Overheat Level) and L8-03 (Heatsink Fan Control) for appropriate settings.

5. 5

   Measure the output current (A) during peak load using a clamp meter; compare against drive/motor rated currents.

6. 6

   Ensure adequate ventilation clearances around the drive as specified in the installation manual.