Siemens SIPART PS2 6DR50xx Manual page 102

Operation
13.SL0 to 33.SL20
L
imit for tight closing
x
Example:
39 YCLS = UP
41 YCUP = 85.0
100%
90
80
70
60
50
40
L
imit for tight closing
30 Example:
39 YCLS = DO
40 YCDO = 15.0
20
10
0
0 10 20 30 40 50
Figure 4-9 Setpoint characteristic, manipulated variable standardization and tight closing function
102
Six valve characteristics are stored in the positioner
linear
S
equal percentage
S
equal percentage
S
equal percentage
S
inverse equal percentage
S
inverse equal percentage
S
inverse equal percentage
S
freely adjustable
S
Setpoint turning points
A flow parameter can be assigned to the respective setpoint turning
value at an interval of 5 %. These points lead to a polygon chain with
20 straight lines which therefore represents a projection of the valve
characteristic.
9 SFCT = Lin
Setpoint
w
60 70 80 90 100 %
The setpoint vertex values can only be input at 12.SFCT=FrEE. You
may only enter a strictly monotonous characteristic, and two consecu-
tive vertex values must differ by at least 0.2 %.
(12.SFCT = Lin, factory setting)
1 : 25 (12.SFCT = 1:25)
1 : 33 (12.SFCT = 1:33)
1 : 50 (12.SFCT = 1:50)
25 : 1 (12.SFCT = n1:25)
33 : 1 (12.SFCT = n1:33)
50 : 1 (12.SFCT = n1:50)
(12.SFCT = FrEE)
L
imit for tight closing
x
Example:
39 YCLS = UP
41YCUP = 75.0
100%
90
80
Setpoint turning point
70
Example:
12 SFCT = FrEE
18 SL5 = 45.0
60
50
40
L
imit for tight closing
30
Example:
39 YCLS = DO
40YCDO = 10.0
20
10
0
0 10 20 30 40 50
SL 0 1 2 3 4 5 6 7 8 9 10
Setpoint
w
60 70 80 90 100 %
11 12 13 14 15 16 17 18 19 20
SIPART PS2 Manual
A5E00074631--06