40 Rockwell Automation Publication 750-QS100B-EN-P - August 2020
Step 7: Tune the Motor Side Inverter Control
Motor Inertia Test
Use this test to measure the motor inertia only when the following are all true:
• The application uses Flux Vector motor control mode.
• The motor inertia value cannot be obtained from the manufacturer.
• It is possible to operate the motor while it is uncoupled from the load.
See the Auto Tuning section in the PowerFlex 755T Flux Vector Tuning application technique, publication 750-AT006
,
for more information about the autotuning features of the drive.
1. Navigate to parameter 10:910 [Autotune]. Press the EDIT soft key.
2. Edit the value to 4 'InertiaMotor'. Press the ENTER soft key.
3. Ensure that the motor is uncoupled from the load. Ensure that the area around the motor is safely secured and the
motor shaft can freely rotate up to a speed of 75% of the motor nameplate base speed.
4. Press the Start key .
You can stop motor rotation at any time during this test by pressing the Stop key .
5. Wait for the test to complete. When complete, the drive stops and the HIM status display shows 'Stopped'.
Parameter 10:900 [Motor Inertia] is updated and parameter 10:901 [Load Ratio] is set to 0.
Perform the Motor ID Test
A Motor ID test is recommended when using Sensorless Vector, or Economize motor control modes. A Motor ID test is
required when using Flux Vector motor control mode. There are two methods of conducting a Motor ID Test. It is only
necessary to conduct the test using one of these methods:
• Rotate Motor ID Test on page 41
: This is the preferred method. This method requires that the motor be
uncoupled from the load and can safely be rotated up to Base speed. Applications that use a permanent magnet
motor require the Rotate Motor ID test.
• Static Motor ID Test on page 42
: If the motor is coupled to the load or cannot be rotated, use this method. The
Static Motor ID Test cannot be used for applications that use a permanent magnet motor. This test can only be
used for applications that use an induction motor.
See the Auto Tuning section in the PowerFlex 755T Flux Vector Tuning application technique,
publication 750-AT006
, for more information about the autotuning features of the drive.
IMPORTANT The motor rotates during this test.
TIP You can leave the load uncoupled from the motor because it will need to be uncoupled to perform the Rotate Motor ID Test.
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