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    What does the term " 2 wire type" mean on the Altivar ATV61/71 drives?

    Issue: 
    What is 2 wire type on the Altivar 61/71?
     
    Product Line:
    Altivar 61, Altivar 71
     
    Environment:
    All serial numbers
     
    Cause:
    N/A
     
    Resolution:
    2 wire type will determine how the drive responds to the run command when the VFD is powered with the run command active, while in 2 wire control :  See examples below

    [2 wire type] [Transition] (trn)
    LEL [Level] (LEL): State 0 or 1 is taken into account for run (1) or stop (0).  The unit will run if run command is active on power up and the VFD is in 2 wire control  
    trn   
    [Transition] (trn): A change of state (transition or edge) is necessary to initiate operation, in order to prevent accidental restarts after a break in the power supply.  The run must transition from low to high on power up.
    PFO [Fwd priority] (PFO): State 0 or 1 is taken into account for run or stop, but the “forward” input always takes
    priority over the “reverse” input.

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