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    Why is the ATV61/71 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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