Initialization - Samson 3787 Mounting And Operating Instructions

4.4.2 Initialization

After connecting the supply air and electri-
cal connections to the bus cable, initializa-
tion must be started. During initialization,
the positioner adapts itself optimally to the
friction conditions and signal pressure re-
quirements of the control valve.
Caution!
Initialization takes several minutes to
complete. During this time, the con-
trol valve moves. Therefore, never in-
itialize while a process is running,
but only during the start-up phase
when the shut-off valves in the plant
section are closed. Alternatively,
remove the control valve with posi-
tioner from the plant and initialize
on a test bench.
Arrow for mounting
position
Zero switch Metal tags
Fig. 11 ⋅ View of the positioner cover open
Pointer
Manual operation
Adjustment screws for
limit switches
Enter data on valve and actuator under
"Start-up" in the operating software.
Set "Type of initialization" to "Rated
range", select "Maximum range" only
for three-way valves.
Start initialization.
A successful initialization is indicated in the
operating software and over the LEDs (see
chapter 4.1).
Carry out the configuration suitable for
the valve type.
The following setting is recommended:
Fail-safe position "Actuator stem ex-
tends":
Direction of action: increasing/increas-
ing (>>), the globe valve opens with in-
creasing reference variable
Final position at a reference variable
less than 1% (tight closing),
Serial interface Simulation switch
LED
Write protection
switch
Dimensions
0FF
Key for initialization
and zero calibration
31
EB 8383-1 EN