MTS Acumen - Manual (Page 178)

9. Repeat for displacement and force control modes.
Adjust Tuning (Expert)
In this procedure, you will adjust individual tuning controls in the controller while applying program command
and observing the system response.
Important:
This workflow is intended for advanced users only. Improper tuning may result in unstable system
performance and equipment damage.
Important:
There is an interrelation between control modes when tuning. When you adjust the tuning values
of one control mode, the other tuned control modes are affected. After auto tuning, it is best practice
to adjust only the tuning values of the control mode you intend to use (active control mode). For
dual-mode use, adjust and verify the tuning values of both modes iteratively until you obtain
satisfactory results.
1. On the Explorer tab, right-click Tune for Specimen and then click Advanced Tuning to show the
MTS Series 793 Controller software Tuning window.
2. Define program command appropriate for anticipated test values by entering Channel, Control Mode,
Target Setpoint, Amplitude, Frequency, and Wave Shape values.
3. Clear interlocks, apply power, and so on, to prepare the system to run the modeling program. (The
green check mark shows when the system is ready to tune.)
4. Click the green Run button to apply the program.
5. Observe system response, and on the MTS FlexTest controller Tuning window, adjust individual tuning
controls and filter settings in the Adjust, Filter, Limiting, and Advanced tabs.
6. Repeat for displacement and force control modes and save the tuning set.
Pretest Configuration
This panel allows you to perform a variety of pretest actions prior to starting the test. Some typical tasks
include:
• Use manual control to zero force, and then apply auto-offset to displacement. This starts the test from
a zero force reference.
• Reposition specimen limits to levels with which you are comfortable in regard to desired test forces.
• To achieve a greater degree of precision for setting specimen limits, model maximum test forces by
turning on the peak-valley layer control in the Situational Awareness (SA) Panel. Apply a command
using the function generator (see
Generate Command (p. 179)) to reveal the peak and valley values,
and adjust accordingly.
Performing Setup for Additional Specimens
Quick access:
Explorer tab > Set Up > Additional Specimens > Install Specimen and Configure
If you have installed, made adjustments to, and tuned one specimen and are going to test another specimen
of the same type, you can click Install Specimen and Configure to change settings prior to inserting the
178 | MTS Acumen ™
Best Practices for Other System Configurations and Tests