Cause : Fault during brake test comes when the brake test is only run after power-up. If Warning has been selected in parameter 404, the warning will come when the brake test finds a fault.

1. If Trip has been selected in parameter 404, the frequency converter will trip when the brake test finds a fault.
2. The brake test may fail for the following reasons: 

• No brake resistor connected or fault in the connections;
• defective brake resistor or defective brake transistor.
• A warning or alarm will mean that the brake function is still active.