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What can cause a tnF on an ATV630 and ATV930 drives?

Published date: 22 October 2019

Issue:
What can cause a tnF on an ATV630 and ATV930 drives?

Product Line:
Altivar ATV630 ATV930

Environment:
All model numbers, all serial numbers

Cause:
This fault appears only if autotuning has been executed.

Resolution:
This fault can be caused if special motor or a motor power that is not within the range of the drive.  Check that the motor/VFD are compatible.  Check that motor the motor is present during autotuning.  If an output contactor is being used, verify that it is closed during autotuning.  Verify that the motor is stopped during autotuning.  In case of reluctant motor, reduce PSI Align Curr Max or MCr.

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