Rockwell Automation Publication 2198-UM002G-EN-P - February 2019 425
Motor Control Feature Support Appendix E
that the dynamic test will not return expected results if the torque limit is set
below 30.0.
Table 191 - Slip Test via Messaging
The Dynamic test requires the Positive and Negative Torque Limits for said
axis are not over-written while the test is in progress. This can be satisfied by
making sure that (1) these cyclic attributes are not checked as writable within
the Drive Parameters tab of the axis properties and (2) these parameters are not
being messaged via an MSG instruction.
When configured for closed-loop control, the Dynamic test requires that an
accurate system inertia is set in the Logix Designer application.
• For the Logix Designer application, version 29.00 or later, a default
value is automatically populated by the controller.
• For the Logix Designer application, version 28.00 or earlier, this can be
done by running and accepting the results of an Autotune test, or by
entering the motor inertia value directly into the Logix Designer
application.
When configured for closed-loop control, the Dynamic test uses the velocity
regulator tuning as entered into the Logix Designer application. If the motor is
coupled to a load, the velocity regulator tuning may need to be adjusted to
make sure the velocity response is well controlled. The Dynamic test fails if the
steady-state velocity feedback is not within a ±30% tolerance of the
commanded velocity.
If using the Dynamic test in Frequency Control mode, uncouple the motor
from any load or results may not be valid. In closed-loop control, either a
coupled or uncoupled load produces valid results.
Attribute
Offset
Type Attribute Name
Conditional
Implementation
Description
3095 REAL IM Slip Test Torque Limit
Closed loop induction
motor only
Sets positive and negative torque limits for the slip test within the Dynamic motor test
(similar to the torque limits in the inertia test). Units are in percent of rated torque.
3096 REAL IM Slip Test Velocity Command
Sets the velocity command for the slip test within the Dynamic motor test, (similar to the
velocity command in the inertia test). Units are in percent of motor rated speed.
IMPORTANT The Dynamic test is not supported in closed-loop Torque Control.
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