MTS Systems FlexTest SE Service Information

Model 493.02 Controller Service
About Tuning
Tuning
210
Other Considerations
Servovalves Most of the servovalve adjustments are performed during the system
installation and do not require periodic adjustment. There are two
types of servovalves:
• Three-stage servovalves, such as the MTS Series 256 and 257
Servovalves, have an inner loop control system which must be
tuned before the outer loop can be tuned.
• Two-stage servovalves, such as the MTS Series 252 Servovalves,
do not have inner loop tuning requirements.
After initial system tuning and before final tuning, the valve balance
should be checked and adjusted if necessary.
Using specimens Specimens can be very expensive. A dummy specimen is an
inexpensive material that has similar characteristics to the specimen
selected for testing. The most important specimen characteristic is its
spring rate.
The advantage of a dummy specimen is that it can simulate how your
testing system reacts to real specimen. You can establish a more
precise level of tuning with a dummy specimen.
Tuning without dummy
specimens
If you do not have a dummy specimen or if a dummy specimen is not
practical, review the following recommendations if you must use a real
specimen:
• Start your PIDF controls at minimum settings.
• Do not use a square waveform for a massive specimen or a
specimen prone to vibrations.
• Adjust rate to minimize any oscillation, overshoot, or ringing in
the waveform.
• Be very conservative by beginning with a ramp waveform to
establish initial control. Then use a waveform that resembles the
test waveform to provide a precise level of control.

MTS Systems FlexTest SE Specifications

General

Brand	MTS Systems
Model	FlexTest SE
Category	Controller
Language	English