MTS Series 793 - Manual (Page 38)

MTS Series 793 Tuning and Calibration
About Tuning
Introduction 38
About Auto Tuning
The auto-tuning feature tunes any PIDF control mode to a moderate level. It
exercises the actuator with a sweep function while monitoring the feedback of the
control mode being tuned. Then it calculates the control mode’s PIDF tuning
parameters.
Note Standalone FlexTest SE Controllers are not equipped with Advanced or
Advanced Only auto-tuning modes.
Your controller includes three auto-tuning modes: Basic, Advanced, and
Advanced Only. The Advanced auto-tuning mode automatically performs Basic
auto-tuning before progressing to Advanced auto-tuning. The Advanced Only
mode omits Basic auto-tuning and performs only Advanced auto-tuning.
Basic auto-tuning
When you run Basic auto-tuning, the auto-tuner disregards your current PIDF
gain settings
. It applies the minimum required drive signal to ramp the feedback
to 80% of the auto-tuning limits. It then measures the relationship between the
feedback velocity and the valve opening signal and then derives the minimum
PIDF gains required to track the command.
The majority of tests will run adequately with the settings calculated through
basic auto-tuning, however, advanced auto-tuning may be used to optimize the
results obtained through basic auto-tuning.
Advanced and
Advanced Only auto-
tuning
When you run Advanced auto-tuning, the auto-tuner first does basic auto-tuning.
It then runs a sine sweep to exercise the actuator to 20% of the auto-tuning limits
with frequencies between 0.5 Hz and a user set maximum of 100 Hz.
Note The advanced auto tuner will reduce the sweep amplitude if it detects a
valve opening that is more than 50% of full scale.
When you run Advanced Only auto-tuning, the auto-tuner skips basic auto-
tuning and runs a sine sweep described earlier.