BC short circuit

What does 7191 mean?

A short circuit has been detected within the brake chopper circuit, specifically occurring when an earth fault condition is also present and the brake chopper is active. This is a severe fault that can lead to rapid destruction of the brake chopper power components and poses a safety risk due to high current flow.

Additional Steps

Steps 1–2 are listed in Priority Fix.

1. 3

   Measure the resistance of the brake resistor and its cabling for any short circuits.

2. 4

   Verify the wiring between the drive, brake chopper, and resistor for correct connections and absence of shorts to ground.

3. 5

   Contact ABB service if internal brake chopper failure is suspected after thorough external checks.