Heatsink Overheat
Yaskawa · VS-616G5 Variable Speed Drive
What does OH mean?
The OH condition indicates that the inverter's heatsink temperature has risen above the set OH Pre-Alarm Level (L8-02). This is a warning that the inverter is approaching an over-temperature condition. If the temperature continues to rise, the inverter will likely trip to protect its internal power components.
Complete Troubleshooting Guide
- 1
Ensure the inverter's cooling fans are operational, free from obstructions, and clean of dust and debris.
- 2
Verify that the ambient temperature around the inverter is within its specified operating limits.
- 3
Check for adequate ventilation around the inverter enclosure; remove any blockages to airflow.
- 4
Clean the heatsink fins and internal cooling passages thoroughly.
- 5
Review and potentially adjust the OH Pre-Alarm Level (L8-02) if it is set too low for the application's normal operating conditions, while maintaining proper protection.