{}

Our Brands

Impact-Company-Logo-English Black-01-177x54

Welcome to the Schneider Electric Website

Welcome to our website.
Search FAQs
What is a USF fault on ATV61/71?
Issue:
USF fault on ATV61/71.

Product Line:
All drives.

Environment:
All.

Causes:
Low voltage on drive's DC bus.

Resolution:
USF is a mains undervoltage fault that appears when the drive's DC bus goes below a certain value.
Check the Mains voltage on L1, L2, and L3 with a true RMS meter.
Measure DC voltage on drive's DC bus PA (+) and PC(-) with meter.

Schneider Electric Ireland

Explore more
Range:
Articles that might be helpful Users group

Discuss this topic with experts

Visit our Community for first-hand insights from experts and peers on this topic and more.
Explore more
Range: