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What can cause a Load Slipping (ANF) fault on an ATV340 series drive?

Published date: 11 February 2019

Issue:
ATV340 drive shuts down with ANF Load Slipping Fault

Product Line:
ATV340 series.

Environment:
In applications using an encoder.

Cause:
The difference between the output frequency and the speed feedback is not correct.

Resolution:
Confirm the drive rating according to the application (motor, load, and so on.)
Verify the motor, gain, and stability parameters.
Add a braking resistor.
Verify the mechanical coupling and wiring of the encoder.

If the torque control function is used and if the encoder is assigned to speed feedback:
Set [Load slip detection] Sdd = [No] no.
Set both [Positive deadband] dbp and [Negative deadband] dbn to a value less than 10% of the nominal motor frequency.
 

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