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    On high HP ATV61/71, what is the purpose of the terminals R0 S0 T0?

    Issue:
    On high HP ATV61/71, what is the purpose of the terminals R0 S0 T0?

    Product Line:
    ATV61 ATV71

    Environment:
    High HP models

    Cause:
    The high HP range of VFDs have terminals R0 S0 T0.

    Resolution:
    VFDs of frame size 10 - 15 use a heatsink blower fan that requires 3phase power. Power provided on L1L2L3 of the VFD also powers the blower, so the R0S0T0 terminals can be disregarded.  For applications where the VFD is only powered by the DC bus, R0S0T0 are used to connect an external power supply to the blower.  See the installation manual for required internal wiring connection modifications.

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