IGBT Overtemperature

What does 41 mean?

The calculated temperature of the drive's Insulated Gate Bipolar Transistors (IGBTs) has exceeded its safe operating limit. This critical condition can be caused by excessive motor load, high ambient temperatures, insufficient cooling air flow, a dusty heatsink, high switching frequency, or internal hardware malfunction. Overheated IGBTs are prone to rapid degradation and catastrophic failure.

• Continuous motor operation above rated current (e.g., parameter P1-03 exceeding motor nameplate current for extended periods).
• Blockage of the heatsink cooling fins or failure of the drive's internal cooling fan (verify fan rotation at speed command).
• Ambient temperature surrounding the drive exceeding its specified maximum operating temperature (e.g., >40°C or 104°F).
• Short circuit or ground fault in the motor windings or motor cables (measure resistance between motor phases U, V, W to ground).
• Internal drive thermal sensor malfunction providing inaccurate temperature readings (verify reading of P0-02, Drive Temp).

Click steps to track your progress.

1. 1

   1. Reduce the motor load by adjusting the process or verify the motor is not undersized for the application.

2. 2

   2. Power down the drive, then inspect and clean all cooling fins on the drive's heatsink using compressed air.

3. 3

   3. Verify the functionality of the drive's internal cooling fan by observing its rotation during operation or by checking fan failure alarms (if available).

4. 4

   4. Measure the ambient temperature directly at the drive's air intake, ensuring it is within the drive's specified limits.

5. 5

   5. Using a megohmmeter, perform an insulation resistance test on the motor and motor cables (U, V, W to ground and between phases).

6. 6

   6. Check parameters related to overload protection, such as P1-03 (Motor Rated Current) and P1-06 (Motor Overload Class), ensuring they are correctly configured.