Samson 3730-5 - Page 56

valves with two clearly defined mechani
-
cal end positions, e.g. three-way valves
(see section 7.6.1)
4
NOM nominal range
Initialization mode for all globe valves
(see section 7.6.2)
4
MAN manually selected range
Initialization mode for globe valves with
an unknown nominal range (see section
7.6.3)
4
SUB substitute calibration (emergency
mode)
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 ini-
tialization by pressing the INIT key after
mounting the positioner on the valve and
defining the valve closed position and set-
ting the volume restriction. The positioner
only needs to work with its default settings. If
necessary, perform a reset (see section 7.8).
Alternating displays
Initialization running
Symbol depending on ini
-
tialization mode selected
Bar graph display
indicating the progress of
the initialization
Initialization successful,
positioner in automatic
operating mode
The time required for an initialization pro
-
cess depends on the transit time of the actu
-
ator and take several minutes.
After a successful initialization, the
positioner runs in closed-loop operation in
-
dicated by .
A malfunctioning leads to the process being
canceled. The initialization error appears on
the display according to how it has been
classified by the condensed state. See sec-
tion 8.3.
Note: Positioner with extended EXPERT
+
di-
agnostics automatically start to plot the ref-
erence graphs (drive signal steady-state d1
and hysteresis d2) after initialization has
been completed. tESt d1 or tESt d2 appear
on the display in an alternating sequence.
An error during the plotting of the reference
graphs is indicated on the display by Code
81.
The positioner still works properly, even
though the reference graph plotting has not
been completed successfully.
Valve closed position AIR TO CLOSE
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 be
-
tween reference variable and valve position:
56 EB 8384-5 EN
Start-up – Settings
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