YOKOGAWA UT55A - 8.6 Suppressing Hunting (Super2 Function)

8-100
IM 05P01C31-01EN
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
+
–