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What causes a DB unit short circuit on an ATV61 drive?

FA275018

23 January 2021

Issue:
Getting DB unit short circuit fault on Atlivar 61 or Altivar 71.

Product Line:
Altivar Machines, Altivar 61, Altivar 71

Environment:
All

Cause:
This fault appears only for the drives > 90kW.
Short circuit inside the braking module.
Braking resistor in short circuit.
Short circuit to the ground.
BRA=NO (ramp autoadaptation) and no braking resistor.

Resolution:
Check the wiring of the braking unit and the resistor.
Check the configuration of the drive.
Disable the BUF parameter in the Fault Management menu.