MTS Systems FlexTest SE Service Information

Model 493.02 Controller Service
About Tuning
Tuning
194
When to Tune
Tuning is needed whenever any of the following events occurs:
• A gross change in the compliance or size of the test specimen. For
example, you were testing steel and change to rubber.
• The servohydraulic configuration has changed. For example, a
servovalve is replaced or changed to a different capacity.
• The system is sluggish (slow to react or not reaching the desired
peaks). However, this is not always a tuning problem; it could be
insufficient velocity capability such as a low-capacity servovalve.
• If a control channel or sensor is recalibrated.
• The system is unstable (indicated by a humming or screeching
sound).
• When you observe a degradation in controlled accuracy.
• When you create a new control mode, or, if the sensor for a
control mode is changed.
• The end levels or frequencies are significantly different from those
observed earlier in the test. For example, you notice that the
specimen characteristics change during the test (this could also
mean the specimen is failing).
Checklist Use this checklist when you tune a system. You need to determine the
following:
• What type of control mode do you wish to tune?
Read “Control Mode Characteristics” on page 196.
• What controls should you use?
Read “How the Tuning Controls Work” on page 199.
• What kind of a tuning program should you use?
Read “Creating a Tuning Program” on page 207.
• Do you have a dummy specimen?
Read “Other Considerations” on page 210.
• Where do you connect the oscilloscope and what signal do you
monitor? Read “Monitoring Waveforms” on page 211.

MTS Systems FlexTest SE Specifications

General

Brand	MTS Systems
Model	FlexTest SE
Category	Controller
Language	English