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10.SL0 to 30.SL20
L
imit for tight closing
x
Example:
35 YCLS = UP
37 YCUP = 85.0
100%
90
80
70
60
50
40
L
imit for tight closing
30
Example:
35 YCLS = DO
36 YCDO = 15.0
20
10
0
0
10
20
30
40
50
Figure 61
Setpoint characteristic, manipulated variable standardization and tight closing function
SIPART PS2 PA Manual
A5E00127926--05
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
point 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 turning point can only be input at You may only enter a
strictly monotonous characteristic, and two consecutive vertex values
must differ by at least 0.2 %.
(9.SFCT = Lin, factory setting)
1 : 25
(9.SFCT = 1 : 25)
1 : 33
(9.SFCT = 1 : 33)
1 : 50
(9.SFCT = 1 : 50)
25 : 1
(9.SFCT = n1 : 25)
33 : 1
(9.SFCT = n1 : 33)
50 : 1
(9.SFCT = n1 --: 50)
(9.SFCT = FrEE)
L
imit for tight closing
x
Example:
35 YCLS = UP
37YCUP = 75.0
100%
90
80
Setpoint turning point
70
Example:
15 SL5 = 45.0
9 SFCT = FrEE
60
50
40
L
imit for tight closing
30
Example:
35 YCLS = DO
36 YCDO = 10.0
20
10
0
0
10
20
30
40
50
SL 0
1
2
3
4
5
6
7
8
9
10
Operation
Setpoint
w
60
70
80
90
100 %
11
12
13
14
15
16
17
18
19
20
103
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