What can cause a buF [DB unit sh. circuit] fault on an ATV340 series drive and how do I correct it?

Consulter notre FAQ

Issue:
Customer is experiencing BUF [DB unit sh. circuit] Fault on an ATV340 series drive.

Product Line:
ATV340

Environment:
External Braking resistor is being used.

Cause:
Short-circuit from braking circuit.

Resolution:

This fault appears when there is a short-circuit on the output of the braking transistor (desaturation of the braking IGBT).

Verify the wiring of the braking unit.

Verify that the braking unit value is not too low.