Technical FAQs

Ask a Question

ATV61 (ATV71) drive is tripping on DB unit sh. circuit fault (fault code bUF)

Issue:
ATV61 or ATV71 - getting DB unit sh. circuit fault (bUF)

Product Line:
ATV61 drives. 
230V - ATV61HD55M3X and larger
460V - ATV61HD90N4 and larger
600V - ATV61HC11Y and larger

ATV71 drives. 
230V - ATV71HD55M3X and larger
460V - ATV71HD90N4 and larger
600V - ATV71HC11Y and larger

Environment:
ATV61 or ATV71 drives without a DB (Dynamic Braking) Resistor or Braking Unit.

Cause:
Short circuit in DB Braking Module, Shorted Braking Resistor, Short to Ground
The drives factory default is with the [Brake res. fault Mgt] set to Freewheel.

Resolution:
If a Dynamic Braking module and/or DB Resistor is installed, check for short circuit or overheating issues.

If Dynamic Braking is not being used;

Go to Menu 1.8 [Fault Management] and scroll to [BU Protection].
Change [Brake res. fault Mgt] from Freewheel (default setting) to Ignore.

This configuration is to be used only if there is NO braking unit or resistor connected to the drive.




 

Was this helpful?
What can we do to improve the information ?