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What would cause the ATV630 drive to have a surging motor when the drive is running in auto mode?

Issue:
What would cause the ATV630 drive to have a surging motor when the drive is running in auto mode?.

Product Line:
ATV630

Environment:
All

Cause:
Analog input was getting interference noise and analog input was oscillation up and down. 

Resolution:
Customer was experiencing noise on his line causing motor/drive fluctuations. Had customer activate filter for AI2F. Set to 5 seconds.
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