Operation Liquiline CM442/CM444/CM448
84 Endress+Hauser
Chlorine control with feedforward control
Utilize the advantage of the effectively wear-free control with binary outputs versus a control
system with relay. It is possible to achieve virtually continuous dosing using a dosing pump with
higher input frequency through pulse frequency modulation (PFM).
1. Connect the proximity switch INS from assembly CCA250 to a digital input of the DIO
module. Configure a controller in the software, selecting the binary input for the function
"Controller Enable" which the proximity switch is connected to. Leave the "Signal type" in the
inputs menu at the factory setting "Static signal" as the selected input.
2. Connect the flowmeter value to the second input of the DIO module. Set the "Signal type" for
this input to "PFM" in the inputs menu and select the corresponding measured value.
You can now use this input in the controller menu as the disturbance variable for your
controller
1)
. To do so, in the submenu "Disturbance variable" select the binary input to
which you connected the flow measured value as the "Source of data."
3. You can activate a dosing pump through PFM via a digital output of the DIO module. In the
outputs menu, set the "Signal type" of the corresponding binary output to "PFM" and use the
previously configured controller as the "Source of data." Observe your dosing's direction of
action, so that you correctly install the "Actuator type."
You must make additional settings in the controller menu to fully customize the control to
your process conditions.
1) An activation code, Order No. 71211288, is necessary for the "feedforward control" function.
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