Commissioning Liquisys M CCM223/253
48 Endress+Hauser
C NO contact on three-point step controller Z2 Delay for controller switch-off, see field Z2
D Alarm relay Z3 Delay for controller switch-on, see field Z3
E Flow below switch-off limit Z 4 or flow failure 0 Off
1 On
Feedforward control to PID controller
You can optimize control on control systems with very short response times by measuring
the medium flow rate in addition to the oxygen content. Then apply this flow rate value (4
to 20 mA) as feedforward control to the PID controller.
A0025120
33 Sample arrangement for feedforward control of the flow in the main stream to the PID controller
1 Medium tapping point 5 Flow assembly CCA250
2 Static mixer 6 Liquisys CCM253
3 Injection points
4 Flowmeter
Feedforward control is a multiplying function as illustrated in the figure below (example
with factory setting):
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