Samson TROVIS SAFE 3731-3, Mounting And Operating Instructions

Page: 50 / 104

7.4 Allocating the closed
position
Taking into account the type of valve and the
operating direction of the actuator, allocate
the closed position (0 % travel):
4 AIR TO OPEN (
AtO
)
Signal pressure opens the valve.
Fail-close
4
AIR TO CLOSE ( AtC )
Signal pressure closes the valve.
Fail-open
NOTICE
Double-acting actuators must always be set
to AIR TO OPEN
(AtO ).
Initialization
AIR TO OPEN
AIR TO CLOSE
Turn
→
Code
0
Press , display: MAN
Code 0 blinks.
Turn
→
Init
Press
Turn until the required closed position
appears on the display.
Press
to confirm the closed position.
Turn
→
ESC
Press to exit
or:
Start initialization as described in sec-
tion 7.5.
For checking purposes:
After the positioner
has been initialized successfully, the valve
closed position is indicated on the positioner
display as 0 %, whereas the valve open
position is indicated by 100 %. If this is not
the case, the closing direction has to be
adapted correspondingly and the positioner
needs to be re-initialized.
7.5 Positioner initialization
WARNING!
During initialization, the control valve moves
through its entire travel/angle of rotation
range. Therefore, do not start the initializa-
tion procedure while a process is running,
but only during start-up when all shut-off
valves are closed.
Before starting initialization, check the maxi-
mum permissible signal pressure of the con-
trol valve. During initialization, the
positioner issues an output signal pressure
up to the maximum supply pressure sup-
plied. If necessary, limit the signal pressure
by connecting an upstream pressure reduc-
ing valve.
50
EB 8387-3S EN
Start-up – Settings