YOKOGAWA UT55A User Manual

1-5
IM 05P01C31-01EN
Introduction to Functions
1
1.3 Control Functions
Controlmodeschematicdiagram Description
Cascade control
PV1
OUT
PV2 (RSP)
PID1
PID2
“Cascade control” uses two control computation
unitsandpermitsCascadecontrolusingjusta
single controller.
Remote input (RSP) terminal is required for
Loop-2PVinput.
► 8.1.4CascadeControl,CascadeHeating/
cooling Control, and Cascade Position
Proportional Control
Loop control
for backup
PV
OUT from host
(RSP)
OUT
DI
PID
“Loop control for backup” allows control in
connection with host control equipment (such as
another controller or programmable controller
(PLC)). If the host control equipment breaks down
and the controller receives the FIAL signal, the
controller performs backup control operations.
Remote input (RSP) terminal is required for output
tracking input.
► 8.1.5LoopControlforBackup,Heating/
cooling Loop Control for Backup, and Position
Proportional Loop Control for Backup
Loop control
with
PV switching
PV1 PV2 (RSP)
OUT
DI
PID
“LoopcontrolwithPVswitching”usestwoPV
inputs, which are switched according to input
contact signals or measurement ranges.
Remote input (RSP) terminal is required for
Loop-2PVinput.
► 8.1.6LoopControlwithPVSwitching,
Heating/coolingLoopControlwithPV
Switching, and Position Proportional Loop
ControlwithPVSwitching
Loop control
with
PV auto-selector
PV1
PV2
(RSP)
PV3
(AIN2)
PV4
(AIN4)
OUT
PID
SELECT
“LoopcontrolwithPVauto-selector”automatically
selects or calculates the max. value, the min.
value,theaverage,ordifference(ofPV1andPV2)
oftwotofourPVinputs.
Remote input (RSP) terminal and auxiliary analog
input terminal are required for the inputs 2, 3, and 4.
► 8.1.7LoopControlwithPVAuto-selector,
Heating/coolingLoopControlwithPVAuto-
selector, and Position Proportional Loop
ControlwithPVAuto-selector
Loop control
with
PV-hold function
PV
OUT
DI
PID
HOLD
“LoopcontrolwithPV-holdfunction”holdsthePV
input value and control output value according to
the input contact signals.
► 8.1.8LoopControlwithPV-holdFunction,
Heating/coolingLoopControlwithPV-hold
Function, and Position Proportional Loop
ControlwithPV-holdFunction

YOKOGAWA UT55A Specifications

General

Brand	YOKOGAWA
Model	UT55A
Category	Temperature Controller
Language	English