Cause : Heatsink Overheat comes when the heatsink temperature exceeded the overheat pre-alarm level set to L8-02. The default value for L8-02 is determined by drive model selection (o2-04).

When a Yaskawa L1000A drive displays a "Heatsink Overheat" fault, it means that the temperature of the drive's heatsink has exceeded safe operating limits. The heatsink plays a crucial role in dissipating heat generated during the operation of the drive's power electronics. Here's how you can address this issue:

1. Immediate Action: If the heatsink overheat fault occurs, immediately stop the operation of the drive to prevent further damage.

2. Allow Cooling: Give the drive some time to cool down. Turn off the power to the drive and allow it to cool naturally. Ensure that there is proper airflow around the drive to aid in cooling.

3. Inspect Cooling System: Check the cooling system of the drive, including fans and airflow pathways. Ensure that fans are functioning correctly and that there are no obstructions blocking airflow to the heatsink.

4. Verify Ambient Conditions: Check the ambient temperature and environment where the drive is installed. High ambient temperatures or poor ventilation can contribute to overheating issues. Consider improving ventilation or installing additional cooling measures if necessary.

5. Reduce Load: Excessive load on the motor can lead to increased heat generation in the drive. Consider reducing the load on the motor or adjusting the application parameters to operate within the rated capacity of the drive.

6. Check Drive Placement: Ensure that the drive is mounted in a location that allows for proper heat dissipation. Avoid mounting the drive in enclosed spaces or areas with limited airflow.

7. Inspect Heatsink: Visually inspect the heatsink for any signs of damage, corrosion, or blockages. Clean the heatsink if necessary to remove dust or debris that may be obstructing airflow.