Cause : Heat-sink overheat comes when the temperature of the heat sink, a component designed to dissipate heat from electronic devices, exceeds a predetermined threshold.

heat-sink overheat fault in drive indicate that the temperature of the heat sink exceeds its safe operating limit. This means heat sink becomes too hot, it indicates that the drive's cooling system isn't functioning properly or the drive is operating under conditions that generate excessive heat.

Troubleshooting Steps for Heat Sink Overheat Fault:

1. Check Ventilation and Airflow:

   • Ensure the drive is installed in a well-ventilated area with sufficient space for air to circulate around the unit.
   • Remove any obstructions around the drive's air vents, and make sure there’s no blockage that restricts airflow.

2. Inspect and Clean Cooling Fans:

   • Check the drive’s internal cooling fans to ensure they are operating properly. If the fans are not spinning or are running slower than normal, clean or replace them.
   • Clean any dust or debris from the fans and air filters to allow proper cooling.

3. Monitor Ambient Temperature:

   • Measure the ambient temperature around the drive to ensure it’s within the recommended range (typically 0°C to 40°C).
   • If the ambient temperature is too high, consider improving ventilation, using external cooling systems, or relocating the drive to a cooler environment.

4. Reduce Motor Load:

   • If the drive is operating at or near its maximum capacity for long periods, reduce the motor load to decrease heat generation.
   • Review the application to ensure the drive is not undersized for the required load. If necessary, upgrade to a larger drive.

5. Inspect Heat Sink for Dirt and Debris:

   • Visually inspect the heat sink for dust or dirt buildup, which can reduce its ability to dissipate heat effectively.
   • Clean the heat sink with compressed air or a soft brush to improve thermal dissipation.

6. Check Switching Frequency:

   • Review the switching frequency settings in the drive’s configuration. If the frequency is too high, reduce it to the recommended levels based on the motor size and application.
   • Consult the Delta drive manual for recommended settings for your specific drive model.

7. Test Temperature Sensor:

   • Verify the accuracy of the temperature sensor located on the heat sink. If the sensor is faulty or misaligned, it may trigger false overheat alarms. Replace or realign the sensor if needed.

8. Monitor Power Dissipation:

   • Check the current going through the drive and IGBT module to ensure they are not being overloaded. Excessive current or power loss in the IGBT can generate more heat than the heat sink can dissipate.

9. Verify Drive Ratings and Sizing:

   • Ensure the drive is appropriately rated for the motor and application it is controlling. If the drive is undersized, it may be prone to overheating under normal operating conditions.