About Tuning
Model 493.02 Controller Service
Tuning
207
Creating a Tuning Program
The purpose of a tuning program is to produce a command that
reflects the most demanding system response expected from a test.
Note The Function Generator is very useful for quickly setting up a
tuning program.
Initial tuning is best done with a waveform that has abrupt changes.
This excites the system at frequencies likely to be unstable with
excessive gain. Square and ramp waveforms are preferred. Final tuning
can be done with the actual program command for the test.
Note Always monitor the sensor feedback or error signal to evaluate the
control accuracy. See “Monitoring Waveforms” on page 211.
A typical tuning program is a low-amplitude (5% to 10% of full-scale),
low-frequency (1 Hz to 2 Hz) square waveform.
This section describes how the amplitude, frequency, and waveform
type of a tuning program can be selected to reflect the capabilities of
the testing system or the testing requirements.
Auto tuning Auto tuning provides a moderate level of tuning for PIDF control
modes.
Auto tuning exercises the actuator (with a sweep function) while
monitoring the feedback of the control mode being tuned. The
response of the control mode is determined and the appropriate tuning
parameters are calculated.
For more information, refer to “Auto tuning” on page 217.
Command waveforms A tuning program produces a cyclic program command to exercise the
system while you make the initial tuning adjustments. A square wave is
best because it demands the maximum response of the servo hydraulic
system. The square wave tuning program may not be suitable for all
systems. The following describe the different waveform characteristics:
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