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    How can you set up the ATV21 and ATV212 drives for a 4 to 20mA loss of follower?

    Issue:
    How can you set up the ATV21 and ATV212 drives for a 4 to 20mA loss of follower?

    Product Line:
    Altivar ATV21 and ATV212 drive.

    Environment:
    All

    Cause:
    They want to get the drive to fall back to a fixed speed if the 4 to 20mA signal is loss.

    Resolution:
    Programming to set up the ATV212 drive to have a fallback speed.
    F----- enter
    F633= Loss of VA set to any value above 0%
    F644= 4-20mA loss behavior
    F644 options
    0=No
    1 -Freewheel stop
    2- Set speed
    3- Speed maintained
    4- Ramp stop
    F649=Fallback speed set point in hz.
    See the programming manual S1A53838 page 130 for more information.

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