MTS Series 793 - Manual (Page 87)

How to Manually Tune the Control Loop
MTS Series 793 Tuning and Calibration Tuning Procedures 87
Rule-of-thumb Adjust the P Gain and D Gain controls as high as possible without going
unstable.
If instability is present, a P Gain or D Gain value approximately 1/2 the
current value is appropriate.
13. Adjust the I Gain tuning control.
A. Set an initial I Gain that is 10-50% of your current P Gain setting.
B. Monitor the dc error using a scope or meter.
C. Change the command to disrupt the system by setting Valve Balance to
a different value.
Standalone FlexTest SE Controllers:
Select Setup > Output > Valve Balance
Automated Controllers:
Adjust the Valve Balance control on the Drive panel. The error should
return to zero within 5–10 seconds. If not, increase the reset (I Gain)
setting and repeat the procedure until the error zeros itself within a
reasonable time period.
14. Save your tuning settings.
Standalone FlexTest SE Controllers: Setup > Open/Save Parameters >
<<Save>>
Automated Controllers: On the Station Manager File menu, select Save
Parameters As.
You can either select an existing parameter set or enter the name of a new
parameter set to save.
About saving elements
of a parameter set
It is important that you save your parameter set as you complete the various
parts that make up a parameter set. Throughout this manual you will be
performing discrete procedures while building a single parameter set.
• If you have already established your default parameter set for the
current station and you are creating a new parameter set for a specific
test, save the parameters with a different name.
• Different tests and/or specimens may require different parameter sets.