MTS Series 793 - Manual (Page 111)

How to Perform Advanced Tuning Techniques
MTS Series 793 Tuning and Calibration Tuning Procedures 111
The Integrator Gain control becomes available by selecting, in the Station
Builder application, the Edit Dual Compensation Modes window’s Mean and
Amplitude Control.
About compensation
gain settings
When reading this section, assume that the Station Builder application has
defined a Force/Displacement dual compensation control mode and that:
• The force signal is the less stable secondary feedback signal, used for
command compensation. Command programs produced by the Function
Generator and other applications use this signal’s dimension.
• The displacement signal is the more stable primary feedback signal, used by
the PIDF controller to maintain closed-loop control.
Conversion Gain
Conversion Gain applies the gain that converts the force command to a
displacement command for a PIDF or external controller.
The force signal provided by the compensator is multiplied by the following
equation to create the displacement signal used to program the PIDF or external
controller.
The Conversion Gain setting depends on the specimen stiffness. See
“Calculating conversion gain” on page 111
Integrator Gain The Integrator Gain improves the static accuracy when the command is paused
or stopped.
I Gain For best performance, set I Gain as low as possible when using compensation
methods that provide mean correction. These methods include peak/valley phase
(PVP), peak/valley compensation (PVC), and arbitrary end-level compensation
(ALC).
Note When using PVC, setting I Gain too high may result in system instability.
Calculating conversion
gain
Use this method to calculate the proper Conversion Gain setting. Assume a
Force/Displacement dual compensation control mode.
1. Set limits as appropriate and install the specimen.
2. Using the Station Manager window’s Function Generator, excite the
specimen in displacement control using a small amplitude sine wave.
Conversion Gain Value x
Full Scale Displacement
Full Scale Force
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