YOKOGAWA UT Advanced UT32A User Manual page 145

10.1 Setting Control Output Type
Position Proportional Output
Heating/cooling Output
10-2
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.
UT35A/UT32A
PV
TC
Furnace
Burner
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.
Controller
Control
computation
Control
Feedback
output
input
Comp-
arator
Valve position
signal
When current is used for feedback input, only wiring is different
► Wiring for current: 17.4.4 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 is equipped only with Heating/cooling type.
► Heating/cooling output: 8.2.3 Heating/cooling Control
H (direct) or L (reverse)
contact signal
Position signal
Motor-operated valve
Direct action
Reverse
action
M
Slide-wire resistor
Motor-operated
valve
Control motor
Air
Gas
IM 05P01D31-01EN