Cause : I2t Inverter comes when the inverter section of your drive is experiencing excessive thermal stress and is at risk of overheating. This means the instantaneous load condition is maintained, then the inverter will be thermally overloaded.

The A025 alarm in siemens master drive indicate an inverter overload condition. This indicates that the inverter section of the drive is experiencing excessive heat generation and is at risk of overheating.

1. Reduce converter load.
2. Check whether the rated output current or the peak current (operating class II) is (was) too high.