Outputs
pH 298, LF 298, Oxi 298, Cl 298
44
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of the controller is shown below. Thus it is possible to realize different transmis-
sion behavior for different parts of the control range.
figure 5-4 Characteristic curve PID controller (example: pulse width output)
1
target value
Measured value that should be achieved by the control
2
dead band +
,
dead band -
Range around the target value. No regulation takes place within this
range.
3
break point x+
,
break point x-
The break points divide the control ranges for each relay into a range
where the differential ratio (
derivative t.
)
and integral ratio
(
integral time
)
take effect, and into a range where only the differential
ration takes effect.
4
break point y+
,
break point y+
Output value assigned to the measured value at the break point
(here: Pulse width in %)
5
lower limit
,
upper limit
upper or lower limit of the control range
y/%
-
100
%
-
2
+
3
+
5
+
2
-
3
-
5
-
4
+
4
-
1
Relais
1
Relais
2
X
w
-
100
%
Summary of Contents for CL 298
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