Project Planning Manual SIPART DR20
The rear of the label is unprinted and can be used for any divisions, including engineering units.
A dimensional drawing of the scale label and information on a suitable labelling unit are included in
the operating instructions.
X
S25
S26
1
0
- 1
y
0
T
F
Xd
t
A
Xd / Xw
K
P
c2
X
X
2
(r)
- 1
- 1
S27
- 1
S26
K
P
V
V
T
v
+
+
T
n
y' - p ---> y
0
+
+
+
d
p
S1
2
≠
2
i
S28
0
1
y'
y
a
y
e
Y
A
S2
0, 3
1, 2
ig. 3/20 PID controller structure
Response threshold for xd (dead-zone element): If the controller output is to be dampened in
addition to the effect of the filter, it is possible to set a response threshold for the negative deviation
(parameter A). See adjacent Fig. 3/21. It is essential
to set A > 0 in the case of S controllers (two-
position controllers with 2 outputs and three-position
step controllers). The gain is zero in the case of
reached in t
xd output
A Xd input
Fig. 3/21 Dead-zone element
F
small negative deviations, the parameterized Kp is
he case of large deviations.
44
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