Cause : TEMPERATURE DIFFERENCE comes when excessive temperature difference between several parallel connected inverter modules. xx (1...12) refers to inverter module number and y refers to phase (U, V, W).

The code 4380 in your ABB ACS800 drive indicates a fault related to an excessive temperature difference between several parallel inverter modules. This signifies a potential overheating issue within the drive that requires attention.

1. Alarm is indicated when temperature difference is 15°C.
2. Fault is indicated when temperature difference is 20°C.
3. Excessive temperature can be caused e.g. by unequal current sharing between parallel connected inverters.
4. Check cooling fan.
5. Replace fan.
6. Check air filters.