Rockwell Automation 20B PowerFlex 70, PowerFlex 700 Reference Manual - Manual (Page 42)

Autotune
42 Rockwell Automation Publication PFLEX-RM001H-EN-P - June 2013
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The second method calculates them from the user-entered motor nameplate
data parameters. When [Autotune] is set to 3 “Calculate”, any changes made
by the user to motor nameplate HP, Voltage, or Frequency activates a new
calculation. This calculation is based on a typical motor with those nameplate
values.
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Finally, if the stator resistance and flux current of the motor are known, the
user can calculate the voltage drop across the stator resistance. Then set
[Autotune] to 0 “Ready” and directly enter these values into the [Flux
Current] and [IR Voltage Drop] parameters.
Autotune Procedure for Flux Vector
For FVC vector control an accurate model of the motor must be
used. For this reason, the motor data must be entered and the autotune tests
should be performed with the connected motor.
Motor nameplate data must be entered into the following parameters for the
Autotune procedure to obtain accurate results:
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[Motor NP Volts]
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[Motor NP FLA]
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[Motor NP Hertz]
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[Motor NP RPM]
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[Motor NP Power]
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[Motor Poles]
Next the Dynamic or Static Autotune should be performed:
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Dynamic - the motor shaft will rotate during this test. The dynamic autotune
procedure determines the stator resistance, motor flux current, and leakage
inductance. The test to identify the motor flux current requires the load to be
uncoupled from the motor to find an accurate value. If this is not possible
then the static test can be performed.
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Static - the motor shaft will not rotate during this test. The static test
determines only [IR Voltage Drop] and [Ixo Voltage Drop]. This test does not
require the load to be uncoupled from the motor.
The static and dynamic tests can be performed during the Start-up routine on the
LCD HIM. The tests can also be run manually by setting the value of [Autotune]
to “1,” (Static Tune) or “2” (Rotate Tune), respectively, and then starting the
drive.
After the Static or Dynamic Autotune the Inertia test should be performed. The
motor shaft will rotate during the inertia test. During the inertia test the motor
should be coupled to the load to find an accurate value. The inertia test can be
performed during the Start-up routine on the LCD HIM. The inertia test can
also be run manually by setting [Inertia Autotune] to 1 “Inertia Tune”, and then
starting the drive.
Vector FV