MTS Systems FlexTest SE Service Information

Model 493.02 Controller Service
Servovalve Controls
72
Use the following paragraphs to determine when to perform each
servovalve adjustment.
Note During system installation, perform all of the adjustments in this
section.
Initial adjustments Perform initial adjustments when initially installing the system or
replacing a hydraulic component. These adjustments, such as setting
servovalve polarity, are only needed once and should not require
readjustment.
See “Setting the Servovalve Polarity” on page 73.
.Valve balance While running a test on a properly tuned system, you observe that the
controlling sensor’s peak and valley amplitudes are unequal. When
you have completed a mechanical valve adjustment, always adjust the
valve balance.
See “Adjusting Valve Balance” on page 75.
Dither Adjust the dither while running a test on a properly tuned system, you
observe either of the following:
• A sinusoidal test waveform is distorted at its maximum and
minimum points (peak and valley values change). This will
normally be more observable during a test that has either a low-
frequency or a low-amplitude test waveform. This indicates that
dither amplitude is insufficient.
• An unusual sound (hammering, squealing, or pounding) coming
from the test system. This indicates that dither amplitude is
excessive.
See “Adjusting dither amplitude” on page 76.
Inner loop tuning Perform inner loop tuning when initially installing a system or fine
tuning a system that employs a 3-stage valve driver.
See “Tuning the Inner loop” on page 77.

MTS Systems FlexTest SE Specifications

General

Brand	MTS Systems
Model	FlexTest SE
Category	Controller
Language	English