YOKOGAWA UT Advanced UT32A, Руководство пользователя

Страница: 131 / 340

8-36
IM 05P01D31-01EN
8.6 Suppressing Hunting (Super2 Function)
Description
The Super2 function suppresses the hunting effect of the controller without re-tuning the
PID parameters.
Hunting means the PV becomes unstable and oscillates around SP.
SUPER2 = ON
Hunting
PV SP PV
● In hunting condition, the Super2 function selects the output from process model as PV
signal.
● The process model removes a factor of dead time from the actual process.
● The real process is under the open-loop condition.
● After hunting is suppressed, the Super2 function selects real PV signal, and carry out
the standard feedback control.
PID control
SP
OUT PV
CPV
Process
PV
Process
model
+
–