Sfct' Setpoint Function; Sl0 - Siemens 6DR50 Series Operating Instructions Manual

Parameterizing/addressing
9.4 Description of parameters
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:
162
• 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 descrip-
tion of the "'13.SL0' ... '33.SL20' Setpoint turning point (Page 162)"
parameter 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"
Set with parameter value
Lin
1-25
1-33
1-50
n1-25
n1-33
n1-50
FrEE
SIPART PS2 with and without HART
Operating Instructions, 09/2014, A5E00074631-12