Initializing The Positioner - Samson 3731-5 Mounting And Operating Instructions

Operating the positioner
For checking purposes: after initialization is completed, the positioner display must read 0 %
when the valve is closed and 100 % when the valve is open. If this is not the case, adapt the
closing direction and re-initialize the positioner.

7.5 Initializing the positioner

WARNING
!
Risk of injury by exposed moving parts on the positioner, actuator or valve.
Do not touch or block exposed moving parts.
NOTICE
!
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.
Note
Reset positioner to its default settings (see section 7.7) 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 defined 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 range (MAN)
Initialization mode for globe valves with an unknown nominal range (see section 7.5.3)
56 EB 8387-5 EN