MTS Series 793 - Manual (Page 80)

MTS Series 793 Tuning and Calibration
How to Manually Tune the Control Loop
Tuning Procedures 80
E. Repeat C and D until you achieve a optimum waveform.
Unstable sounds
For actual testing, if your system goes unstable it will sound unstable—that
is, it will emit an annoying high-pitched sound (accompanied by high-
frequency actuator movement) that is quite different from the usual tuning
sound (“ka-chunk, ka-chunk”). If your system begins to go unstable, quickly
readjust the control that caused the instability.
10. Adjust the I Gain tuning control.
Standalone and Automated Controllers:
Set up a peak/valley meter to monitor the peaks and valleys of the sensor
signal. The peaks and valleys should be balanced. Before adjusting reset (I
Gain), be sure the feedback signal is repeatable (that is, the same peaks and
valleys are achieved).
If the command is not centered on zero, monitor the difference between
peaks and valleys of the sensor feedback to the upper and lower levels of the
test command. Any difference should be the same.
Ringing
Overshoot
The middle waveform is the
optimum waveform. In some
cases the waveform will have
no overshoot or ringing.
Gain (P)
Rate (D)
Low High
High