Stability Control For Frequency Control - Allen-Bradley Kinetix 5700 User Manual

Stability Control for
Frequency Control
Id Feedback, Iq Feedback versus Commanded Speed with Stability Control Disabled
60
50
40
30
20
10
0
-10
-20
Commanded Frequency, Hz
Iq Feedback
Attribute
Type Attribute Name
Offset
Stability Control
3026 SINT
Enable
Stability Filter
3027 REAL
Bandwidth
Stability Voltage
3028 REAL
Gain
3029 REAL Stability Angle Gain
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
Id Feedback
Stability control for frequency control is not enabled by default. You can enable
via messaging by using the following device-specific attributes.
TIP We recommend you leave the angle, voltage gains, and filter bandwidth at
the default values.
Table 187 - Enable Current Limiting via Messaging
Conditional
Description
Implementation
Enables stability control when configured for frequency control.
0 = Stability Control is disabled
1 = Stability Control is enabled
Sets the bandwidth of the low-pass filter applied to the current feedback signal. This bandwidth is
Frequency Control
common to both the angle and voltage stability control algorithms. Units of radians/second.
Induction Motor only
The gain of the voltage stability control function. Only active when configured for frequency control.
Units of Volt (inst,p-n)/Amp (inst).
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.
Rockwell Automation Publication 2198-UM002G-EN-P - February 2019
Motor Control Feature Support
Id Feedback, Iq Feedback versus Commanded Speed with Stability Control Enabled
25
20
15
10
5
0
-5
Commanded Frequency, Hz
Iq Feedback
Appendix E
Id Feedback
413