Sfct' Setpoint Function; Sl0 - Siemens SIPART PS2 Operating Instructions Manual

9.4.2.5

'12.SFCT' Setpoint function

Possible settings:
Purpose:
Factory setting:
Seven valve characteristics are stored in the positioner and are selected using the 'SFCT'
parameter:
Valve characteristics
Linear
Equal percentage
Equal percentage
Equal percentage
Inverse equal percentage
Inverse equal percentage
Inverse equal percentage
Freely adjustable
9.4.2.6 '13.SL0' ... '33.SL20' Setpoint turning point
Adjustment range:
Purpose:
Factory setting:
SIPART PS2 with and without HART
Operating Instructions, 05/2017, A5E00074631-AC
● Lin
● 1 - 25
● 1 - 33
● 1 - 50
● n1 - 25
● n1 - 33
● n1 - 50
● FrEE
This parameter is used to linearize nonlinear valve characteristics.
Optional flow characteristics as shown in the figure in the description
of the '13.SL0' ... '33.SL20' Setpoint turning point (Page 153) pa‐
rameter are simulated for linear valve characteristics.
Lin
1:25
1:33
1:50
25:1
33:1
50:1
0.0 ... 100.0
These parameters are used to assign a flow coefficient in units of
5% to each setpoint turning point. The setpoint turning points form
a polyline with 20 linear segments which models the valve charac‐
teristic; see figure below.
"0", "5" ... "95", "100"
Parameter assignment
9.4 Description of parameters
Set with parameter value
Lin
1-25
1-33
1-50
n1-25
n1-33
n1-50
FrEE
153