Omron CX-PROCESS MONITOR PLUS V2 - 01-2007 Operation Manual page 109

Tuning Screens
1,2,3...
94
1. Click Execute FT at the upper left portion of the Tuning Screen, as shown
below.
The following FT Execution Dialog Box will be displayed.
2. Set the degree of Response improvement, Overshooting control, and
Hunting control to any of the five levels and then click the OK Button. Ei-
ther one or two of these can be set for one executed, but all three cannot
be set at the same time.
Fine tuning will be executed according to the settings, the resulting PID
constants will be stored automatically, and the new values will be displayed
at the top of the Tuning Screen.
3. Repeat the above process as many times as required to achieve suitable
settings.
4. Click the Undo Button to return to the previous PID constant settings. If the
Undo Button is pressed a second time, the FT settings will be returned to.
Execute fine tuning when the control performance produced by autotuning is
not acceptable, when autotuning produces inconsistency in the PV, or when
you cannot allow control to be interrupted.
Fine tuning uses three user settings for hunting control, overshooting, and
response improvement along with fuzzy inferences from previous control con-
ditions to improve control by automatically setting PID parameters.
Either one or two of the user settings for hunting control, overshooting, and
response improvement can be set to any of five levels. For example, to better
control hunting and overshooting, the Overshoot and Hunting parameters can
be set to the desired levels.
Section 4-8