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    How do the ATV31/ATV312 logic inputs work when the VFD is in SINK mode?

    Issue:
    How do the ATV31/ATV312 logic inputs work when the VFD is in SINK mode?

    Product Line:
    ATV31 and ATV312

    Environment:
    All model

    Cause:
    Developing control scheme

    Resolution:
    The VFD is in sink mode when the control board DIP switch is in the SINK position.

    Internally, the sinking mode connects the logic inputs to the +24V as the common.  A logic input is turned on by connecting it to the COM by means of a dry contact.

    Note: When the logic inputs are configured for sink logic, grounding an input signal can result in unintended activation of drive controller functions.

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