AC Drive Heatsink Overtemperature Fault

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The temperature of the power unit's heatsink has exceeded its permissible limit, triggering a fault. This can be due to insufficient cooling air flow, accumulation of dust on the heatsink, high ambient temperature, excessive switching frequency, or a malfunctioning cooling fan. Prolonged operation at high temperatures significantly reduces the lifespan of power electronic components.

• Clogged or blocked heatsink cooling fins due to excessive dust and debris accumulation, restricting airflow.
• Failure of one or more heatsink cooling fans (e.g., motor failure, seized bearings), leading to reduced heat dissipation.
• High ambient temperature in the installation environment, exceeding the AC drive's maximum operating temperature specification.
• Recirculation of hot exhaust air back into the drive's cooling intake, preventing effective cooling.
• Overload condition on the AC drive (e.g., continuous operation at 110% rated current), generating excessive heat beyond its capacity.

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1. 1

   1. Measure the ambient temperature at the drive's air intake and compare it to the drive's specified maximum operating temperature.

2. 2

   2. Visually inspect the heatsink fins for dust accumulation and clean thoroughly using compressed air (non-conductive) or a soft brush.

3. 3

   3. Test the operation of all heatsink cooling fans; replace any fan that is not rotating at full speed or is seized.

4. 4

   4. Verify that the clearance requirements for air circulation around the AC drive as specified in the manual are met.

5. 5

   5. Monitor the drive's output current (e.g., parameter P1-05) and compare it to the drive's rated continuous current to detect overload conditions.