YOKOGAWA UT55A User Manual

8-96
IM 05P01C31-01EN
8.4.5 SwitchingPIDAccordingtoDeviation(ReferenceDeviation)
Description
ThezonePIDselectionbydeviationswitchesbetweenthegroupsofPIDparameters
according to the amount of deviation.
This function is called “reference deviation.”
In the fixed point control, if the actual amount of deviation exceeds the setpoint of the
reference deviation, the controller automatically changes to the PID parameter group
(PID
ofgroup
R)setforthezone.Iftheactualamountofdeviationbecomessmallerthan
the setpoint of reference deviation, the controller changes to the PID parameter group
appropriateforthe
zone.
Forexample,ifthedeviationislarge,PVcanbereachedmorerapidlytoSPby
increasing the proportional gain (i.e., narrowing the proportional band). Switching PID
accordingtodeviationiseffectivewhenZONissetto1,2,4.ThezonePIDselectionby
referencedeviationhaspriorityoverotherzonePIDselections.
Reference deviation (RDV)
Reference deviation (RDV)
Reference point 2
Reference point 1
Minimum value of
PV input range
SP
PID of group R PID of group R
PID of group 2
PID of group R: PID for reference deviation
PID of group 2
PV
Maximum value of
PV input range
PID No. to be selected
Setting Details
Parameter
symbol
Name
Display
level
Setting range Menusymbol
ZON
ZonePID
selection
STD
0: SP group number selection 1
1:ZonePIDselection(selection
byPV)
2:Zone
PIDselection(selection
by target SP)
3: SP group number selection 2
4:ZonePIDselection(selection
by SP)
CTL
RDV
Reference
deviation
STD
OFF: Disable
0.0+1digitto100.0%ofPVinput
range span (EUS)
ZONE
PID
PID number
(display only)
EASY
1 to 8, R: PID group for reference
deviation
MODE
Note1: In Cascade control, the LP2 lamp is lit while the Loop-2 parameter is displayed.
Note2: A currently-used PID number is displayed for the parameter PID.
8.4SwitchingPID

YOKOGAWA UT55A Specifications

General

Brand	YOKOGAWA
Model	UT55A
Category	Temperature Controller
Language	English