6 Commissioning
TopCal S CPC 300
62
EHauser
The controller in the CPM 153:
The CPM 153 contains a PID controller which is specially adapted to the pH neutralisa-
tion process. It has the following features:
•
Separate configuration of both process sides,
•
Simple adaptation to batch or inline processes,
•
Switching option between constant and range-dependent modulation gain.
Relating to the effect on the gain factor, a difference is made between two standard
implementations:
•
The factor K
R
(X) is the total gain
(see fig. 28. This is implemented in the CPM 153).
•
The gain factor K
P
(X) is the purely proportional gain.
The following diagram shows the schematic structure of the CPM 153 controller.
Because of the simplicity of the diagram, the Laplace transform of subfunctions is given.
ƒig. 28:
Schematic diagram of the CPM 153controller with K
R
(X) as the total gain
X
Actual value
W
Set point
E
Control difference
Y
Set value
K
R
Modulation gain (total gain)
T
n
Integral action time (I component)
T
v
Derivative action time (D component)
X
W
E
Y
I
P
D
K (X)
R
*
T *S
v
1/(T *S)
n
1
+
+
+
–
+
C07-CPM153xx-05-06-xx-xx-001.eps
