Brake chopper supervision

What does 12 mean?

This fault indicates an issue with the dynamic braking circuit. Possible causes include the absence of a brake resistor, a physical break in the brake resistor element, or a malfunction within the brake chopper itself. This condition prevents the drive from effectively dissipating regenerative energy generated by the motor during deceleration.

• Fault detected in the brake chopper circuit (resistor or IGBT).
• Overheating of the brake chopper components.
• Short circuit or open circuit in the brake chopper's switching element.
• Incorrect parameter settings related to regenerative braking (e.g., P6-01).
• Brake resistor failure or disconnection.

Click steps to track your progress.

1. 1

   Verify that a brake resistor is physically connected to the drive's designated brake terminals (+UDC/R-, R+).

2. 2

   Measure the resistance of the brake resistor directly at its terminals — verify the measured value matches the resistor's specified nominal resistance.

3. 3

   Inspect the cabling between the drive's brake terminals and the brake resistor for continuity, secure connections, and any signs of damage.