Operating instructions

Parameterizing/addressing
10.4 Description of parameters
SIPART PS2 with and without HART communications
Operating Instructions, 09/2008, A5E00074631-08
149
This smooth switching from manual to automatic mode prevents pressure excess in long
pipelines.
The parameter value "TSUP = Auto" means the slower of the two actuating times determined
during initialization is used for the setpoint ramp. Parameter value "TSDO" then has no
effect.
The factory setting is "0".
10.4.2.5 Description of parameters 12
12.SFCT - Setpoint function
This parameter is used to linearize nonlinear valve characteristics. For linear valve
characteristics, arbitrary flow characteristics are formed.
See figure in
Description of parameters 13 throu
gh 33 (Page 150).
Seven valve characteristics are stored in the positioner and are selected using the "SFCT"
parameter:
Valve characteristics Set with parameter value
Linear Lin
Equal percentage 1:25 1-25
Equal percentage 1:33 1-33
Equal percentage 1:50 1-50
Inverse equal percentage 25:1 n1-25
Inverse equal percentage 33:1 n1-33
Inverse equal percentage 50:1 n1-50
Freely adjustable FrEE
The factory setting is "Lin".