Rockwell Automation Publication 750-QS100B-EN-P - August 2020 43
Step 7: Tune the Motor Side Inverter Control
Autotune Bandwidth Calculations
Perform this procedure only if your application uses Flux Vector motor control. For more information on Autotune
Bandwidth Calculations, refer to the PowerFlex 755T Flux Vector Tuning Application Technique,
publication 750-AT006
. This procedure does not initiate motion.
1. Navigate to parameter 10:902 [Load Coupling].
2. Ensure that the value of the parameter is 1 ‘Compliant’. This indicates that the load is a non-rigid load where
position misalignment, backlash, and flexing of couplings, gearboxes, belts, and shafts can occur which creates an
indirect connection of the load to the motor shaft. This setting is common for most machines. It is the
recommended default setting when parameter 10:901 [Load Ratio] is set to 0.
3. Navigate to parameter 10:907 [System Damping].
4. Ensure that the value of the parameter is 1. This is the recommended default value.
5. Navigate to parameter 10:2020 [LdObs Mode]. This parameter configures the load observer feature. Press the
EDIT soft key.
6. Set the value of the parameter to one of the following options based on which type of Flux Vector control mode
your application uses (Torque, Velocity, or Position):
• 0 ‘Disabled’ - For applications using Torque mode
• 1 ‘LdObs Only’ - For applications using Velocity mode
• 2 ‘LdObs VelEst’ - For applications using Position mode
7. Press the ENTER soft key.
8. Navigate to parameter 10:910 [Autotune]. Press the EDIT soft key.
9. Set the value of the parameter to 6 ‘BW Calc’. Press the ENTER soft key.
The following parameters are calculated based on motor inertia, load ratio, load coupling, system damping, load
observer mode, and motor parameters that were entered in previous steps:
• 10:906 [System BW]
• 10:1010 [Alt Fb GnScale]
• 10:1392 [Max Speed Fwd]
• 10:1393 [Max Speed Rev]
• 10:1898 [Vel Limit Pos]
• 10:1899 [Vel Limit Neg]
• 10:1965 [Accel Limit Pos]
• 10:1966 [Accel Limit Neg]
• 10:2083 [Torque Limit Pos]
• 10:2084 [Torque Limit Neg]
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