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Search FAQs

What is an USF fault on the ATV28 drive?

ATV28 USF fault. 

Product Line:
Altivar ATV28


Mains undervoltage is to low on L1 L2 L3.

USF is an undervoltage fault. 
Check the Mains voltage on L1 L2 L3 with a digital meter.
Check the DC bus voltage on PA and PC

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