Samson 3730 Series - Initializing the positioner

7-6 EB 8384-3 EN
Start-up and conguration
7.5 Initializing the positioner
Risk of injury by exposed moving parts on the positioner, actuator or valve.
Î Do not touch or block exposed moving parts.
The process is disturbed by the movement of the actuator or valve.
Î Do not perform the initialization while the process is running. First isolate the plant by
closing the shut-off valves.
Î Check the max. permissible signal pressure of the valve before starting initialization.
During initialization, the positioner issues an output signal pressure up to the maximum
supply pressure supplied. If necessary, limit the signal pressure by connecting an up-
stream pressure reducing valve.
Reset positioner to its default settings (see the 'Operation' section) before mounting it on a
different actuator or changing its mounting position.
During initialization, the positioner adapts itself optimally to the friction conditions and the
signal pressure required by the control valve. The type and extent of auto tuning depends on
the initialization mode selected:
− Maximum range (MAX) (standard range)
Initializationmodeforsimplestart-upofvalveswithtwoclearlydenedmechanicalend
positions,e.g.three-wayvalves(seesection7.5.1)
− Nominal range (NOM)
Initializationmodeforallglobevalves(seesection7.5.2)
− Manually selected OPEN position (MAN)
Initialization mode for globe valves requiring OPEN position to be entered manually (see
section 7.5.3 )
− Substitute calibration (SUb)
This mode allows a positioner to be replaced while the plant is running, with the least
amountofdisruptiontotheplant(seesection7.5.4).
WARNING
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NOTICE
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Note