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CIP Axis Attributes
Chapter 4
Rockwell Automation Publication MOTION-RM003I-EN-P - February 2018
189
See also
Acceleration Control Configuration Attributes
Motion Control Configuration Attributes
These are the acceleration control configuration attributes associated with a
Motion Control Axis.
Load Observer Configuration
Usage
Access
T Data
Type
Default
Min
Max
Semantics of Values
Optional - C
Set/SSV
USINT
0
-
-
Enumeration
0 = Disabled (R)
1 = Load Observer Only (O)
2 = Load Observer with Velocity
Estimate (O)
3 = Velocity Estimate Only (O)
4 = Acceleration Feedback (O)
5...255 = Reserved
The Load Observer Configuration attribute configures the operation of the Load
Observer. The Load Observer dynamically measures the active load torque applied
to the motor load for the purpose of load disturbance compensation. Selecting the
Velocity Estimate configures the observer to dynamically estimate velocity based
on an internal model of the motor and load. When Velocity Estimate is selected,
this signal is applied to the velocity loop to provide superior control loop
performance. The Velocity Estimate may be used in combination with the Load
Observer by selecting Load Observer with Velocity Estimate. The Acceleration
Feedback configuration applies acceleration feedback to the control loop structure
to improve stability and performance. In effect, Acceleration Feedback is like
adding virtual inertia to the motor thus reducing the Load Ratio.
Load Observer Bandwidth
Usage
Access
T Data
Type
Default
Min
Max
Semantics of Values
Optional - C
Set/SSV
T REAL
FD
0
Loop Bandwidth Units
The Load Observer Bandwidth attribute determines the proportional gain, Kop,
of the load observer. This value represents the unity gain bandwidth of the load
observer.
Acceleration Control
Configuration Attributes