Brake chopper supervision

What does 12 mean?

The brake chopper supervision has detected an issue, indicating either a missing or broken brake resistor, or a defective brake chopper unit. This fault prevents the drive from effectively dissipating regenerative energy, which can lead to overvoltage faults (Fault 2) during deceleration or when braking heavily.

Additional Steps

Steps 1–2 are listed in Priority Fix.

1. 3

   Measure the resistance of the brake resistor to ensure it is within specified limits.

2. 4

   If the resistor and cabling are confirmed to be in good condition, contact the distributor, as the brake chopper unit may be defective.