YOKOGAWA UP55A User Manual

10-9
IM 05P02C41-01EN
Output (Control and Retransmission) Functions
10.6 Reducing4-20mACurrentOutputto0mA
(TightShutFunction)
Description
Tight shut function fully closes the control valve (or other actuators) (i.e., so that output is
zero)beyonditspositionerdeadband.
When the output low limit is set to “SD,” the output is as follows in MAN or AUTO mode.
• In MAN mode
When the output is reduced with the Down arrow key and “SD” is displayed as the
output value, the output level reaches tight shut level. The control output delivers a
tight shut signal (about 0.0 mA).
•InAUTOmode
The output is limited by the output low limit (OL). It does not decrease to 0.0 mA.
Control output
20.0 mA
–5.0%
100.0%
Displayed output value
3.2 mA
4.0 mA
0.0 mA
SettingDetails
Parameter
symbol
Name
Display
level
Settingrange Menusymbol
OL
Control output low limit
Heating-side control
output low limit (in
Heating/cooling
control)
EASY
-5.0 to 104.9%, (OL<OH),
SD: Tight shut (0 mA
output in MAN mode)
In Heating/cooling control: 0.0
to 104.9% (OL<OH)
PID
Note1: The PID number (1 to 8, R) is displayed on Group display while each parameter is displayed.
Note2: In Cascade control, the LP2 lamp is lit while the Loop-2 parameter is displayed.
10

YOKOGAWA UP55A Specifications

General

Brand	YOKOGAWA
Model	UP55A
Category	Controller
Language	English