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What is an USF fault on the ATV58 drive?

Issue:
What is an USF fault on the ATV58 drive?

Product Line:
Altivar ATV58

Environment:
All

Cause:
Mains undervoltage is to low on L1 L2 L3.

Resolution:
USF is an undervoltage fault. 
Check the Mains voltage on L1, L2  and L3 with a digital meter.
Check the DC bus voltage on PA and PC also can be checked on J18 pin 1 and 7.
Can check the Mains voltage on the display: go to SUP and scroll down to ULn to display the Mains Voltage.
Comp[are the displayed voltage to the measured input voltage.
 

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