Brake chopper supervision
Vacon · NX All-in-One Application
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.
Common Causes
- 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.
Repair Steps & Checklist
Click steps to track your progress.
- 1
Verify that a brake resistor is physically connected to the drive's designated brake terminals (+UDC/R-, R+).
- 2
Measure the resistance of the brake resistor directly at its terminals — verify the measured value matches the resistor's specified nominal resistance.
- 3
Inspect the cabling between the drive's brake terminals and the brake resistor for continuity, secure connections, and any signs of damage.