Fault 65 IGBT TEMP in ABB ACS850 Drive

Fault 65 IGBT TEMP in the ABB ACS850 Drive indicates that the temperature of the inverter IGBT (Insulated Gate Bipolar Transistor) power module has exceeded the allowable protection limit. The ACS850 continuously monitors the temperature of its power semiconductors to protect the inverter from overheating and permanent damage. When the IGBT temperature reaches the fault trip level (100%), the drive generates Fault 65 and stops operation.

Fault 65 IGBT TEMP in ABB ACS850 Drive


This fault generally indicates a problem with the drive cooling system, ambient conditions, ventilation, or excessive loading, rather than an internal hardware failure.

Possible Causes

  • High ambient temperature.
  • Insufficient cooling air flow.
  • Cooling fan failure.
  • Reduced cooling fan speed.
  • Blocked ventilation openings.
  • Dirty or clogged heatsink fins.
  • Dust accumulation inside the drive.
  • Motor load exceeds the drive rating.
  • Continuous overload operation.
  • High switching frequency causing additional heat.
  • Poor control panel ventilation.
  • Installation clearances not maintained.
  • Internal cooling path obstruction.
  • Faulty IGBT temperature sensor (less common).
  • Defective IGBT power module (rare).

Solutions

  1. Check the ambient conditions around the drive.
  2. Ensure the ambient temperature is within ABB specifications.
  3. Check cooling air flow through the drive.
  4. Verify correct operation of the cooling fan.
  5. Replace the cooling fan if faulty.
  6. Clean the heatsink fins and remove dust buildup.
  7. Inspect the drive for blocked ventilation passages.
  8. Verify that the motor power matches the drive rating.
  9. Reduce the motor load if necessary.
  10. Improve enclosure ventilation.
  11. Maintain the recommended installation clearances.
  12. Reduce the switching frequency if the application allows.
  13. Allow the drive to cool before restarting.
  14. Replace defective cooling components if required.

Additional Information

The ABB ACS850 continuously monitors the temperature of the inverter's IGBT power module.

Fault 65 IGBT TEMP is generated when the measured IGBT temperature reaches the fault trip limit of 100%.

According to ABB, the first corrective actions are to:

  • Check the ambient conditions.
  • Verify cooling air flow and fan operation.
  • Inspect the heatsink for dust accumulation.
  • Confirm that the motor power is appropriate for the drive rating.

Unlike a Motor Overtemperature Fault, Fault 65 specifically refers to overheating of the drive's internal IGBT power module.

Prolonged operation at excessive temperatures can reduce the service life of:

  • IGBT modules.
  • DC bus capacitors.
  • Cooling fans.
  • Internal electronic components.

Common Symptoms

  • Drive displays Fault 65 IGBT TEMP.
  • Motor stops unexpectedly.
  • Drive enclosure becomes excessively hot.
  • Cooling fan may not operate correctly.
  • Fault occurs during heavy load conditions.
  • Frequent trips during high ambient temperatures.
  • Repeated overheating in poorly ventilated panels.
  • Reduced drive performance before tripping.
  • Heatsink may be covered with dust.
  • Fault may clear after the drive cools down.

Recommended Troubleshooting Sequence

  1. Verify that the fault is Fault 65 IGBT TEMP.
  2. Disconnect power and follow lockout/tagout procedures.
  3. Check the ambient temperature around the drive.
  4. Inspect cooling air flow.
  5. Verify cooling fan operation.
  6. Replace faulty fans if necessary.
  7. Clean the heatsink fins and cooling passages.
  8. Remove dust and contamination from inside the drive.
  9. Check enclosure ventilation.
  10. Verify installation clearances meet ABB recommendations.
  11. Compare motor power with the drive rating.
  12. Check for overload conditions.
  13. Reduce switching frequency if appropriate.
  14. Restore power and restart the drive.
  15. Monitor the IGBT temperature during normal operation.

Fault 65 IGBT TEMP Check Table

Check PointAction
Ambient temperatureVerify within ABB specifications
Cooling air flowCheck for unrestricted airflow
Cooling fanInspect operation and replace if faulty
Heatsink finsClean dust and debris
VentilationImprove panel cooling if required
Motor loadVerify motor power matches drive rating
Installation clearancesConfirm recommended spacing
Switching frequencyReduce if application permits
Temperature sensorInspect if overheating persists
Drive hardwareCheck IGBT module if all other items are normal

Preventive Maintenance Tips

  • Regularly clean heatsinks and ventilation paths.
  • Inspect cooling fans during scheduled maintenance.
  • Replace aging or noisy cooling fans before failure.
  • Keep ambient temperature within ABB operating limits.
  • Ensure adequate airflow around the drive.
  • Match the drive rating correctly to the motor and application.
  • Avoid continuous overload operation.
  • Maintain recommended installation clearances inside control panels.
  • Record recurring Fault 65 IGBT TEMP events for trend analysis.
  • Perform preventive maintenance according to ABB recommendations.

Proper inspection of the ambient conditions, cooling fans, airflow, heatsink cleanliness, and motor-to-drive sizing will help prevent recurring Fault 65 IGBT TEMP faults in ABB ACS850 drives, ensuring reliable thermal protection, efficient cooling, and long-term operation of the inverter power module.

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