Cause : Island condition detected in regen mode comes when the Island trip indicates that the AC mains is no longer present and the inverter would be an ‘islanded’ power supply if it continued to operate. The sub-trip indicates the reason for the trip.

Sub-trip & Description given below:

1 - Island detection system has been enabled and detected an island condition
2 - The minimum synchronization voltage is non-zero and the supply voltage has been below this threshold and been simulating its own supply synchronization for more than 2.0 s.

• Check the supply / supply connections to the regen drive.