YOKOGAWA UP55A - Page 277

10-2
IM 05P02C41-01EN
PositionProportionalOutput
Position proportional output is equipped only with Position proportional type.
In position proportional output, valve opening is made proportional to the control
computation results. The controller outputs direct and reverse signals (relay) to control
motor movement and valve opening.
TC
PV
Furnace
UP55A
Burner
Air
Gas
Motor-operated valve
Control motor
Position signal
H (direct) or L (reverse)
contact signal
Feedback-typePositionProportionalOutput
In feedback-type position proportional output, the controller obtains a valve position
signalfromafeedbackslide-wireresistor(overallresistance:100Ωto2.5kΩ)attached
to a valve or feedback current input (4 to 20 mA).
The following shows an example using feedback slide-wire resistor.
Direct action
Reverse
action
Control
computation
M
Motor-operated
valve
Slide-wire resistor
Control
output
Valve position
signal
Feedback
input
Controller
Comp-
arator
When current is used for feedback input, only wiring is different
► Wiringforcurrent:17.4.5ValvePositionOutputandFeedbackInputWiring
Estimating-typePositionProportionalOutput
In estimating-type position proportional output, set the operating time required for a
valve to change from the fully-closed position to the fully-open position beforehand. With
the preset operating time, the controller controls the valve by estimating its position.
Estimating-type position proportional output is used when feedback input signal cannot
be obtained. (Feedback input wiring is not necessary.)
Note: When the control output is: upper limit=direct signal, lower limit=reverse signal.
Heating/coolingOutput
Heating/cooling output is equipped only with Heating/cooling type.
► Heating/coolingoutput:8.2.3Heating/coolingControl
10.1SettingControlOutputType