Fuji inverter, when the motor slows down, there is an overvoltage alarm. What's going on?

This is because in the process of braking, the motor becomes a generator, which feeds back the electric energy to the inverter, resulting in the over-high DC bus voltage of the inverter, and the inverter alarms over-voltage.

To solve this problem, first slow down the motor slowly and increase the "deceleration time" of the inverter.

Secondly, an external braking resistor should be added and the excess power on the DC bus should be released by using the external braking resistor.