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

Published date: 30 July 2019

Issue:
Braking unit failure

Product Line:
ATV61, ATV71

Environment:
This fault appears only for the drives > 90kW.

Cause:
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.

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