Rockwell Automation Publication 750-QS100B-EN-P - August 2020 39
Step 7: Tune the Motor Side Inverter Control
Enter Motor Inertia
This procedure is only needed for applications that use Flux Vector motor control mode.
1. Determine what value to use for the Motor Inertia parameter. The Motor Inertia parameter is set in units of
kg•m
2
. There are four ways to determine the Motor Inertia value. These four ways are listed from most effective to
least effective:
• If a motor inertia value is provided on the motor nameplate or data sheet, ensure that it is in units of kg•m
2
and
use that value. If the motor inertia value is given in lb•ft
2
or WK
2
, divide the value by 23.73 to convert to
kg•m
2
.
•Perform the Motor Inertia Test on page 40
. This test dynamically measure motor inertia. The test can only be
performed if the load is uncoupled from the motor.
• Use the following equation to roughly approximate the Motor Inertia value based on the motor nameplate
horsepower (HP):
Jm = HP/250 x (HP/500 + 1)
If the motor nameplate provides a value in kW, multiply the kW value by 1.341 to convert to HP for this
equation.
• Let the Motor Inertia parameter stay set to the default value, which is based on a motor power rating that is
equal to the drive power rating.
2. If you used the nameplate/data sheet, or the equation method to find the motor inertia, continue on to step 3
. If
you used the Motor Inertia Test, or chose to leave the Motor Inertia parameter at the default value, then the Motor
Inertia parameter is already set, and you have finished the Enter Motor Inertia procedure.
3. Navigate to parameter 10:900 [Motor Inertia]. Press the EDIT soft key.
4. Edit the value to the motor inertia you found in step 1
, in units of kg•m
2
. Press the ENTER soft key.
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