Samson 3730-2, Mounting And Operating Instructions

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EB 8384-2 EN 67
Start-up and settings
−
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).
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).
Alternating readings
Initialization in progress
Icon depending on
initialization mode selected
Bar graph display indicating
the progress of the
initialization
%
Initialization successfully
completed. Positioner in
automatic mode ( )
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.
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:
Note
Note