Rockwell Automation Publication 2198-UM002L-EN-P - October 2021 405
Appendix F Motor Control Feature Support
Stability Control for
Frequency Control
Stability control is available for induction motors configured for frequency
control. This feature can be used to help remove resonances that are
sometimes seen on larger motors. The stability control feature adjusts the
OutputFrequency and OutputVoltage commands to stabilize the
OutputCurrent.
Figure 217 - Effects of Stability Control
Stability control for frequency control is not enabled by default. You can enable
via messaging by using the following device-specific attributes.
Id Feedback, Iq Feedback A-pk
Id Feedback, Iq Feedback versus Commanded Speed with Stability Control Disabled Id Feedback, Iq Feedback versus Commanded Speed with Stability Control Enabled
Commanded Frequency, Hz
Iq Feedback Id Feedback
60
50
40
30
20
10
0
-10
-20
25
20
15
10
5
0
-5
Id Feedback, Iq Feedback A-pk
Commanded Frequency, Hz
Iq Feedback Id Feedback
We recommend you leave the angle, voltage gains, and filter bandwidth
at the default values.
Table 200 - Enable Current Limiting via Messaging
Attribute
Offset
Type Attribute Name
Conditional
Implementation
Description
3026 SINT
Stability Control
Enable
Frequency Control
Induction Motor only
Enables stability control when configured for frequency control.
0 = Stability Control is disabled
1 = Stability Control is enabled
3027 REAL
Stability Filter
Bandwidth
Sets the bandwidth of the low-pass filter applied to the current feedback signal. This bandwidth is
common to both the angle and voltage stability control algorithms. Units of radians/second.
3028 REAL
Stability Voltage
Gain
The gain of the voltage stability control function. Only active when configured for frequency
control. Units of Volt (inst,p-n)/Amp (inst).
3029 REAL Stability Angle Gain
The gain of the electrical angle stability control function. Only active when configured for
frequency control. Units of radians/Amp (inst).
IMPORTANT
Because the stability control feature works by manipulating the
OutputVoltage and OutputFrequency signals, these signals may appear
'noisy' when the feature is enabled.
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