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What causes a buFo [DB unit op. circuit] fault on an ATV340 and how do I correct it?

Published date: 11 February 2019

Customer is experiencing buFo [DB unit op. circuit] fault on an ATV340 series drives.

Product line:

External Braking resistor is in use.

 Open-circuit from braking circuit.
 Braking resistor not connected.

 Verify the wiring of the braking resistor.
 Verify that the braking resistor value is not too high.



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