AUX E&H Series Instrucciones de operaciones Pagina 30

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5.3.2 Feedforward control to PID controller
In processes with very short response times it may be practical to apply the flow rate to the
controller, if the flow rate fluctuates, in order to optimise the control process.
Feedforward control is a multiplying function as depicted in the below figure (factory setting as
example):
ENDRESS+HAUSER
LIQUISYS M
CAL REL
REL1
REL1
ALARM
REL2
REL2
E
mg/l
25.0 °C
0.42
F
4 ... 20 mA
Acid Lye
Static mixer
CPA 250 with
CPS 11
Liquisys M CPM 253
Injection points
Measuring water
extraction point
Flow meter
Fig. 5.5
Arrangement example for
feedforward control of the
flow rate in the main stream
to the PID controller(s)
1
020406080100Z7
Gain
K
influ
Current input
signal [%]
1.5
0.5
Fig. 5.6
Multiplying feedforward
control
Instrument configuration Liquisys M CPM 223 / 253
28 Endress+Hauser
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