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What is a USF fault on ATV320

Issue:
USF fault on ATV320

Product Line:
Altivar Machine, ATV320

Environment:
All serial numbers

Cause:
• Supply mains too low
• Transient voltage dip

Resolution:
• Measure incoming line to line voltages
• Check the DC bus voltage on PA and PC
• Check the voltage and the parameters of [UNDERVOLTAGE MGT] (USb-)

ATV320 programming manual:
https://www.se.com/ww/en/download/document/NVE41295/