Brake chopper

What does F-04 mean?

This fault indicates an issue with the braking resistor circuit, such as excessive regenerative power, an interrupted or short-circuited braking resistor, or incorrect resistor value. It can also be triggered by a defective brake chopper or a ground fault in the circuit. Failure to address this can lead to DC link overvoltage or inadequate braking performance.

Additional Steps

Steps 1–2 are listed in Priority Fix.

1. 3

   Verify the braking resistor's resistance against its technical specifications; replace if incorrect.

2. 4

   Eliminate any ground faults detected within the braking resistor circuit.

3. 5

   If all external components are confirmed functional, the internal brake chopper might be defective, necessitating inverter replacement.