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    How is the Otr (motor torque) parameter calculated on the ATV61 and ATV71 drives?

    Issue:
    How is the Otr motor torque parameter calculated on the ATV61 and ATV71 drives?

    Product Line:
    Altivar ATV61 and ATV71

    Environment:
    All

    Cause:
    Needs to know how the motor torque Otr parameter is calculated

    Resolution
    The torque of motor (OTR) is not measured by the drive. It is calculated from the measurement of motor current.
    OTR = (Iq / Iqn) * (PhirdRef / Phirn) in %
    With:     Iq : Current torque provide by the command to drive motor
                 PhirdRef : Flux provide by the command to drive motor
                 Iqn : Nominal Current torque compute with the motor name plate
                 Phirn : Nominal flux of the motor
    The maximum accuracy of motor torque is 5% (in closed loop). It can be up to 15% in open loop.
    Concerning the range, OTR is expressed in % of nominal motor torque.
    100% = Nominal motor torque.
    OTR value is signed with minimum value -300% and maximum value 300% 

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