Samson 3730-2 Mounting And Operating Instructions page 67

− Maximum range (MAX) (standard range)
Initialization mode for simple start-up of
valves with two clearly defined mechani-
cal end positions, e.g. three-way valves
(see section 7.6.1)
− Nominal range (NOM)
Initialization mode for all globe valves
(see section 7.6.2)
− Manually selected range (MAN)
Initialization mode for globe valves with
an unknown nominal range (see sec-
tion 7.6.3)
− Substitute calibration (SUb)
This mode allows a positioner to be re-
placed while the plant is running, with
the least amount of disruption to the
plant (see section 7.6.4).
Note
For normal operation, simply start initializa-
tion by pressing the INIT key after mounting
the positioner on the valve and defining the
fail-safe position and setting the volume re-
striction. The positioner only needs to work
with its default settings. If necessary, perform
a reset (see section 7.8).
EB 8384-2 EN
Alternating readings
Initialization in progress
Icon depending on
initialization mode selected
Bar graph display indicating
the progress of the
initialization
%
The time required for the initialization proce-
dure depends on the actuator transit time and
can take a few minutes.
After a successful initialization, the positioner
runs in closed-loop operation indicated by
the closed-loop operation icon.
A malfunction leads to the process being
canceled. The initialization error is displayed
according to how it has been classified by
the condensed state. Refer to section 8.3.
Note
When Code 48 - h0 = YES, the diagnostics
automatically start to plot the reference
graphs (drive signal steady-state d1 and
hysteresis d2) after initialization has been
completed. This is indicated by tESt and d1
or d2 appearing on the display in alternat-
ing sequence.
An error during the plotting of the reference
graphs is indicated on the display over Code
48 - h1 and Code 81.
The reference graphs do not have any effect
on closed-loop operation.
Fail-safe position AIR TO CLOSE
If the slide switch is set to AIR TO CLOSE, the
positioner automatically switches to the di-
rection of action increasing/decreasing (äæ)
after initialization has been completed. This
results in the following assignment between
set point and valve position:
Start-up and settings
Initialization successfully
completed. Positioner in
automatic mode ( )
67