Cause : Brake transistor alarm detection/internal circuit fault comes when the inverter output if a fault occurs in the brake circuit, e.g. damaged brake transistors when using functions of the 75K or more. In this case, the inverter must be powered off immediately. For the 55K or less, it appears when an internal circuit error occurred.

1. Reduce the load inertia.
2. Check that the frequency of using the brake is proper.
3. Check that the brake resistor selected is correct.
4. For the 75K or more, when the protective function is activated even if the above measures are taken, replace the brake unit with a new one. For the 55K or less, replace the inverter.