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    Why will the ATV320 autotune fucntion not work in NST state?

    Issue:   
    ATV320 will not autotune in NST state
     
    Product Line:   
    ATV320
     
    Environment:  
    All
     
    Cause:  
    Autotune not functioning
     
    Resolution:   
    Sometimes, the drive's configuration can prevent an Autotune. 
    For instance, if the drive’s command channel is from a communication network such as Modbus, then a specific command word order must be sent before performing tuning with the keypad.
    1- Power on the drive; ATV320’s state is NST
    2- Write CMD = 6; ATV320’s state is RDY
    3- Write CMD = 7; ATV320’s state is RDY
    4- With the keypad, make “Autotuning” = “Apply Autotuning”; the tune isn’t done
    5- Write CMD = 271; ATV320’s state is RDY
    6- With the keypad, make “Autotuning” = “Apply Autotuning”; the tune is done
     
    Another possibility is when the drive status is NST.
    For instance, if the drive is set for 3-wire control and DI1 is not active, the status will be NST, and an Autotune is not allowed.

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