Rockwell Automation Publication 2198-UM001M-EN-P - November 2022 229
Appendix D Motor Control Feature Support
Motor Analyzer Category Troubleshooting
Calculate Model
When a Calculate test is run, the drive uses motor nameplate data to estimate
the motor’s Rated Flux Current, Stator Resistance (Rs), Stator Leakage
Reactance (X1), and Rotor Leakage Reactance (X2). The drive also calculates
the rated slip speed, based on rated speed and rated frequency. No
measurements are taken when using the Calculate test.
Static Motor Test
Use the Static test if the motor shaft cannot rotate or if it is already coupled to
the load. Only tests that do not create motor movement are run. During this
test, the Stator Resistance (Rs), Stator Leakage Reactance (X1), and Rotor
Leakage Reactance (X2) values are measured during a series of static tests. The
Rated Flux Current is estimated, since measurement of this value requires
motor movement. The drive also calculates the rated slip speed, based on rated
speed and rated frequency.
The Static test requires that you enter initial estimates for Rated Flux Current,
Rated Slip Speed, Stator Resistance (Rs), Stator Leakage Reactance (X1), and
Rotor Leakage Reactance (X2) into the Motor Model fields. The method of
entering initial estimates depends on the version of the Logix Designer
application:
• For the Logix Designer application, version 29.00 or later, initial
estimates are populated by the controller.
• For the Logix Designer application, version 28.00 or earlier, initial
estimates can be entered by running and accepting the results of a
Calculate test, or by entering the values directly into the Logix Designer
application.
Dynamic Motor Test
Dynamic tests are run with the motor disconnected from the load because the
motor shaft turns and there are no travel limits. This is often the most accurate
test method. During this test, the Stator Resistance (Rs), Stator Leakage
Reactance (X1), and Rotor Leakage Reactance (X2) values are measured in a
series of static tests. The Rated Flux Current is measured during a rotational
test, in which the drive commands 75% of the motor rated speed.
The rated slip speed is measured during a second rotational test. In this test,
the drive commands a speed (default of 100% of the motor rated speed) and
sets a torque limit (default of 50% of the motor rated torque). This test quickly
accelerates the motor to rated speed and then decelerates back to zero speed.
The Dynamic test also requires that you enter initial estimates for Rated Flux
Current, Rated Slip Speed, Stator Resistance (Rs), Stator Leakage Reactance
(X1), and Rotor Leakage Reactance (X2) into the Motor Model fields. The
method of entering initial estimates depends on the version of the Logix
Designer application:
• For the Logix Designer application, version 29.00 or later, initial
estimates are automatically populated by the controller.
• For the Logix Designer application, version 28.00 or earlier, initial
estimates can be entered by running and accepting the results of a
Calculate test, or by entering the values directly into the Logix Designer
application.
IMPORTANT The Dynamic test does not support travel limits.
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