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

Published date: 21 August 2020

Getting an tnF fault on an ATV630 and ATV930 drive.

Product Line:
ATV630  ATV930

All serial numbers

This fault appears only if autotuning has been executed.

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 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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