F062 fault in WEG CFW900 Drive indicates a Thermal Imbalance. This means there is a significant and abnormal temperature difference between different power modules or phases, suggesting uneven load or cooling.
Cause:
- The temperature difference between IGBT modules of the same phase (U, V, W) is above 15 °C.
- The temperature difference between IGBT modules of different phases (U and V, U and W, V and W) is above 20 °C.
- The temperature difference between rectifier modules of different phases (R and S, R and T, S and T) is above 20 °C.
Remedy:
Verify balanced operational conditions of the IGBT modular blocks. Ensure fans are running correctly on all power books.
