Drive over temperature fault

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The heatsink temperature of the drive has exceeded its acceptable operating limits, triggering a fault. An overtemperature warning typically precedes the actual trip limit. Sustained high temperatures significantly reduce the lifespan of power semiconductors and other internal components.

• Insufficient cooling airflow through the drive heatsink due to blocked vents, dirty cooling fins, or failed cooling fans.
• High ambient temperature in the control cabinet or room exceeding the drive's maximum operating temperature (e.g., >50°C).
• Overloading the drive continuously, causing excessive heat generation in the power semiconductors.
• Malfunctioning heatsink cooling fan(s) (e.g., seized motor, broken blades, electrical failure).
• Failure of the drive's internal temperature sensor, providing an incorrect high-temperature reading.

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1. 1

   Measure the ambient temperature inside the control cabinet using a calibrated thermometer. Verify it is within the drive's specified operating range (e.g., 0°C to 50°C).

2. 2

   Inspect drive cooling fans for proper operation (audible, visible rotation) and check heatsink fins for dust, debris, or blockages. Clean with compressed air if necessary (ensure power off).

3. 3

   Verify the motor load current (e.g., Menu 1-04 'Motor Current') is not consistently exceeding the drive's nominal output current (Ih) rating. Reduce load if necessary.

4. 4

   Check the drive's heatsink temperature reading in the diagnostics menu (e.g., Menu 1-30 'Heatsink temperature'). Compare to observed conditions.

5. 5

   Ensure adequate ventilation in the control cabinet. Verify filters on cabinet vents are clean and cooling systems (e.g., AC unit, heat exchanger) are operational.

6. 6

   Test the drive cooling fans by applying appropriate voltage (if safely accessible) or using drive diagnostic functions to force fan operation (e.g., Menu 15-XX 'Fan test'). Replace faulty fans.