Q: How should we troubleshoot and resolve this fault?
A: Please follow the inspection steps below:
1. Check the inverter power board
* Inspect the inverter power board of the power module for obvious burn marks.
* Check whether key components (such as inverter driver / inverter IGBT) are damaged.
Recommendation: If a spare inverter power board is available, power off the equipment first, replace the board, then restart the unit to check if the alarm is cleared.
2. Check the inverter busbar board
* Inspect the inverter busbar board for obvious damage.
* Check whether the fuse on the inverter busbar board is blown.
Recommendation: If a spare inverter busbar board is available, power off the equipment first, replace the board, then restart the unit to check if the alarm is cleared.