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100 EB 8384-2 EN

Operating the positioner

7.6 Initializing the positioner

Risk of injury by exposed moving parts on the positioner, actuator or valve.

Do not touch or block exposed moving parts.

The process is disturbed by the movement of the actuator or valve.

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 section7.9) before mounting it on a different actu-

ator 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7.6.1)

− 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section7.6.3)

− 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7.6.4).

For normal operation, simply start initialization by pressing the INIT key after mounting the

positioneronthevalveanddeningthefail-safepositionandsettingthevolumerestriction.

WARNING

NOTICE

Note

Samson 373 Series User Manual

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