Samson 3730 Series Mounting And Operating Instructions page 52

Start-up and settings
Positioners with EXPERT
tions start plotting the reference graphs after
the initialization process has been com-
pleted. See note at the end of this section.
Warning!
During the initialization, the control
valve moves through its entire
travel/angle of rotation range.
Therefore, do not start initialization
while a process is running, but only
during start-up, when all shut-off
valves are closed.
Note!
The initialization procedure can be
interrupted while running by press-
ing . StOP appears three seconds
long and the positioner then moves
to the fail-safe position.
%
After a successful initialization, the
positioner runs in control operation indi-
cated by the control symbol.
52
EB 8384-3 EN
+ diagnostic func-
Alternating displays
Initialization running
Bar graph display
indicating the progress of
the initialization
Initialization successful,
positioner in automatic
operating mode
The control position in % predetermined by
the reference variable appears on the dis-
play.
A malfunctioning leads to the process being
interrupted. The initialization error appears
on the display according to how it has been
classified by the condensed status. See sec-
tion 5.7 on page 59.
If the slide switch is set to AIR TO CLOSE,
the positioner automatically switches to the
direction of action increasing/decreasing
(äæ) on successful completion of initializa-
tion. This results in the following assignment
between reference variable and valve posi-
tion:
Fail-safe Direction of
position
Actuator stem
extends FA
AIR TO OPEN
Actuator stem
retracts FE
AIR TO CLOSE
The tight-closing function is activated.
Set Code 15 (final position w>) to 99 % for
three-way valves.
Further settings relevant for the valve can be
entered subsequently.
Note!
Positioner with integrated EXPERT
tics automatically start to plot the reference
graphs (drive signal y d1 and hysteresis d2)
after initialization has been completed. TEST
d1 and d2 appear on the display in an al-
ternating sequence.
An unsuccessful plotting of the reference
graphs is indicated on the display by Code
81 (see error code list).
Valve
action Closed at Open at
ää
4 mA 20 mA
äæ
20 mA
+
diagnos-
4 mA