Endress+Hauser Liquiline CA80SI - Page 72

Operation Liquiline System CA80SI
72 Endress+Hauser
11.4.1 Application examples
Chlorine regulation with feedforward control
CCA250
CA80
Flow, e.g. Promag53
A
BU
BK
BN
CCA250
INS
47
48
91
92
CA80
DIO
1
2
3
Dig.in
CA80: DIO
Dig.in: PFM
91
92
+
–
45
46
CA80
DIO
Dig.out: PFM
A0029239
 63 Example of chlorine control with feedforward control
1 Connection of the inductive proximity switch INS of CCA250 to the digital input of the DIO module
2 Connection of the signal from a flowmeter to the digital input of the DIO module
3 Activation of a (pulse) dosing pump via the digital output of the DIO module
A Dosing pump
Utilize the advantage of the effectively wear-free control with binary outputs versus a
control system with relay. With pulse frequency modulation (PFM), it is possible to achieve
virtually continuous dosing using a dosing pump with higher input frequency.
1. Connect the INS proximity switch of the CCA250 assembly to a digital input of the
DIO module (e.g. slot 6, port 1).
2. In the software, configure a controller and as the source select the binary input
(e.g.Binary input 1) to which the proximity switch is connected. (Menu/Additional
functions/Controllers/Controller 1/Controller Enable = Binary input 1)
3. Signal type: For the selected input, select the factory setting (Static signal).
4. Connect the measured value of a flowmeter to the second input of the DIO module
(e.g. slot 6, port 2).
5. Signal type: for this input, select PFM . (Menu/Inputs/Binary input 6:2/Signal
type = PFM)
6. Input mode: select the corresponding measured value (Flow rate).
 You can now use the input you have just configured as the disturbance variable
for your controller
1)
.
1) An activation code, Order No. 71211288, is necessary for the "feedforward control" function.