Samson 3730-4 - Defining the Valve Closed Position

EB 8384-4 EN 59
Operating controls and readings
6 Operating controls and
readings
Rotary pushbutton
The rotary pushbutton is located underneath
the front protective cover. The positioner is
operated on site using the rotary pushbutton:
Turn : Select codes and values
Press
: conrm setting.
AIR TO OPEN/AIR TO CLOSE slide switch
− AIR TO OPEN applies to a valve opening
as the signal pressure increases.
− AIR TO CLOSE applies to a valve closing
as the signal pressure increases.
The signal pressure is the pneumatic pressure
at the output of the positioner applied to the
actuator.
AIR TO OPEN always applies to positioners
with a mounted reversing amplier for dou-
ble-acting rotary actuators (connections ac-
cording to section4.6).
Volume restriction Q
The volume restriction serves to adapt the air
output capacity to the size of the actuator.
Depending on the air passage at the actua-
tor, two xed settings are available.
− For actuators smaller than 240cm² and
with a signal pressure connection at the
side (Type3271-5), set restriction to MIN
SIDE.
− For a connection at the back (Type3277-
5), set restriction to MIN BACK.
− For actuators 240cm² and larger, set to
MAX SIDE for a side connection and to
MAX BACK for a connection at the back.
%
mm
AIR TO
OPEN CLOSE
INIT
CAUTION
VALVE
ACTUATES
MIN SIDE MAX BACK MIN BACK
MAX SIDE
Q
%
S
mm
%
S
mm
SERIAL INTERFACE
%
mm
Initialization key Cap and rotary switch Metal tag of proximity switch
SSP interface
Switch for AIR TO
OPEN/AIR TO
CLOSE
Volume restriction
Rotary pushbutton
Fig.22: Operating controls