Heatsink Overheat

What does OH mean?

The temperature of the Drive's heatsink has exceeded the programmed setpoint (L8-02, L8-03=0 to 2), indicating inadequate cooling or excessive ambient temperature. This can be caused by a nearby heat source, dirt buildup on fans/heatsink, or high room temperature. Persistent overheating will lead to nuisance trips, reduced performance, and can significantly shorten the Drive's lifespan.

• Blocked cooling fan or clogged heatsink fins with dust, lint, or debris, restricting airflow.
• Excessive ambient temperature in the control cabinet exceeding the Drive's specified operating range.
• Drive cooling fan failure, preventing proper heat dissipation from the heatsink.
• Drive enclosure ventilation issues (e.g., blocked cabinet vents, improperly sized cooling system).
• Continuous operation at high load (near or above rated current) for extended periods.

Click steps to track your progress.

1. 1

   1. Power down the Drive and visually inspect the heatsink fins for accumulation of dust, lint, or debris. Clean thoroughly using compressed air or a soft brush.

2. 2

   2. Check the Drive's cooling fan for proper operation (audible and visible rotation). If faulty, replace the fan assembly.

3. 3

   3. Verify the ambient temperature inside the control cabinet does not exceed the Drive's specified maximum operating temperature (e.g., 50°C).

4. 4

   4. Inspect the control cabinet's ventilation system (filters, fans, air conditioners) to ensure adequate airflow and heat exchange.

5. 5

   5. Confirm parameters L8-02 (Heatsink Overheat Level) and L8-03 (Heatsink Overheat Filter Time) are appropriately set, ensuring L8-03 is not set to a value that would prevent proper detection.