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Why is the drive not following the 4-20mA signal wired into AI3+ on the VW3A3202 extended IO card?

Issue:
Why is the drive not following the 4-20mA signal wired into AI3+ on the VW3A3202 extended IO card?

Product Line:
Altivar ATV61 and ATV71

Environment:
All ATV61 and ATV71 with VW3A3202 option board

Cause:
Analog signal not working

Resolution:
AI3-/ AI3+ is a differential current input.  You must jumper AI3- to the com terminal  before wiring in your 0 to 20mA or 4 to 20mA signal.
Check ref 1 channel to see if its programmed for AI3.
Check resistance between AI3+ and com with no power applied to the drive you should measure 250 ohms.
Check the polarity between AI3+ and com make sure the signal is not inverted.
 

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