Autotune 2-31
Autotune Description of parameters determined by the autotune tests.
Flux Current Test
[Flux Current Ref] is set by the flux current test. Flux current is the reactive
portion of the motor current (portion of the current that is out of phase with
the motor voltage) and is used to magnetize the motor. The flux current test
is used to identify the value of motor flux current required to produce rated
motor torque at rated current. When the flux test is performed, the motor
will rotate. The drive accelerates the motor to approximately two-thirds of
base speed and then coasts for several seconds.
IR Voltage Drop Test
[IR Voltage Drop] is set by the IR voltage drop test. [IR Voltage Drop] is
used by the IR Compensation procedure to provide additional voltage at all
frequencies to offset the voltage drop developed across the stator resistance.
An accurate calculation of the [IR Voltage Drop] will ensure higher starting
torque and better performance at low speed operation. The motor should
not rotate during this test.
Leakage Inductance Test
[Ixo Voltage Drop] is set by the leakage inductance test. This test measures
the inductance characteristics of the motor. A measurement of the motor
inductance is required to determine references for the regulators that control
torque. The motor should not rotate during this test.
Inertia Test
[Total Inertia] is set by the inertia test. [Total Inertia] represents the time in
seconds, for the motor coupled to a load to accelerate from zero to base
speed at rated motor torque. During this test, the motor is accelerated to
about 2/3 of base motor speed. This test is performed during the Start-up
mode, but can be manually performed by setting [Inertia Autotune] to
“Inertia Tune”. The [Total Inertia] and [Speed Desired BW] automatically
determine the [Ki Speed Loop] and [Kp Speed Loop] gains for the speed
regulator.
Autotune Procedure for Sensorless Vector and Economizer
The purpose of Autotune is to identify the motor flux current and stator
resistance for use in Sensorless Vector Control and Economizer modes.
The user must enter motor nameplate data into the following parameters for
the Autotune procedure to obtain accurate results:
• [Motor NP Volts]
• [Motor NP Hertz]
• [Motor NP Power]
Vector
FV
Vector
FV
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