Heatsink Overtemperature Warning

What does OH mean?

The drive has detected a heatsink overtemperature condition. This is a warning that indicates the heatsink temperature has exceeded its normal operating range, but the drive continues to operate in a controlled manner.

• Blocked cooling fins on the heatsink due to dust, dirt, or debris accumulation, restricting airflow.
• Failure of the cooling fan(s) on the drive, or reduced fan speed due to bearing wear or power supply issues.
• Ambient temperature in the control cabinet exceeding the drive's specified maximum operating temperature (e.g., 40°C or 50°C).
• Insufficient clearance around the drive for proper airflow or inadequate cabinet ventilation causing heat buildup.
• Continuous operation at high load current (P0-04) close to or exceeding the drive's rated output.

Click steps to track your progress.

1. 1

   1. Power down the drive, use compressed air to thoroughly clean dust and debris from the heatsink fins and cooling fan inlets/outlets.

2. 2

   2. Verify the cooling fan operation by observing its rotation during startup and checking for unusual noises or vibrations.

3. 3

   3. Measure the ambient temperature inside the control cabinet using a thermometer and compare it to the drive's specified maximum.

4. 4

   4. Check for proper cabinet ventilation (e.g., verify air filters are clean, fans are operating, and exhaust vents are clear).

5. 5

   5. Monitor the drive's output current (P0-04) and heatsink temperature (P0-02) during operation to identify peak loads and corresponding temperature rises.