MTS Series 793 - Manual (Page 110)

MTS Series 793 Tuning and Calibration
How to Perform Advanced Tuning Techniques
Tuning Procedures 110
About Dual Compensation Control Modes
Before dual compensation modes can be tuned, they must first be defined in the
Station Builder application.
Sometimes force feedback signals may be too noisy or otherwise unsuitable for
use in control modes. For example, accelerometer feedback signals have only
dynamic characteristics, making them unsuitable for use in a control mode.
Select a dual compensation control mode for a channel when the feedback for the
desired control mode is unsuitable for maintaining closed-loop control.
A dual compensation mode requires a primary and a secondary feedback signal:
• The more stable primary feedback signal is used by the PIDF controller to
maintain closed-loop control.
• The less stable secondary feedback signal is used for command
compensation in command programs provided by the Function Generator
and other applications.
Dual compensation
controls
Dual Compensation controls display at the bottom of the Station Setup
window’s Compensators panel tabs when a dual compensation mode is selected
in the navigation pane.
Integrator
Compensator
Secondary Feedback to
Compensator (Force)
Command
(Force)
Conversion Gain
Integrator Gain
PIDF
–
+ –
Primary Feedback to
PIDF (Displacement)
Compensated
Command
(Displacement)
Dual compensation control modes compensate based on a
secondary feedback signal and maintain closed-loop control with
a primary feedback signal.
In this Force/Displacement dual compensation control mode,
programming and compensation use the secondary force
feedback signal. The PIDF controller maintains closed-loop
control using the primary displacement feedback signal.
Force Full Scale
Disp. Full Scale