Endress+Hauser Mycom S CPM 153 Operating Instructions Manual page 57

Mycom S CPM 153
Selection aid for batch processes
Process
1-sided
control
2-sided
control
Endress+Hauser
Dosing actuators
1 PWM
1 PFM
with
1 three-PS
signal
1 PWM/PFM
without
signal
current output
2 PWM
2 PFM
with
signal
1 three-PS
1 PWM/PFM
without
signal
current output
PWM = pulse length proportional
PFM = pulse frequency proportional
Three PS = three-point step controller
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
(X) is the total gain
R
(see Fig. 20. This is implemented in the CPM 153).
• The gain factor K
(X) is the purely proportional gain.
P
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.
Required hardware equipment
for control
Circuits Relay Current
inputs
–
1 1
–
1 1
1 2 1
–
1 2
– –
1
1 2 –
1 2 –
1 – –
1 3 1
3
1 –
6 Start-up
Ordering variants
CPM 153-
Current
outputs
–
x1x0xxxxx
–
x1x0xxxxx
–
x1x2xxxxx
–
x1x0xxxxx
1 x1x0xxxxx
–
x1x0xxxxx
–
x1x0xxxxx
1
x1x0xxxxx
–
x1x2xxxxx
– x1x0xxxxx
57