09/01 AWB8230-1412GB
PID controller
93
Application examples
This section contains some setting examples for practical
applications.
Flow control
The example shown in the figure below has the setpoint values
150 m
3
/min and 300 m
3
/min:
Figure 91: Examples for flow control
w: Setpoint value, 4 Bit digital
x: feedback actual value (500 m
3
/min at 20 mA)
B1: Measured value converter
P1: Flow sensor
a Pump
PNU
Meaning in PID control mode Value Notes
F01 Setpoint 150 Direct input of “150 m
3
/min”, as the scaling
factor has been set
A01
Frequency setpoint definition 02 Keypad
A11
Feedback percentage actual value for lower acceptance threshold
(Units: %)
0 0%
A12
Feedback percentage actual value for upper acceptance threshold
(Units: %)
100 100 %
A13
Lower acceptance threshold for voltage or current on the actual value
input (in %)
20 20 %
A14
Upper acceptance threshold for voltage or current on the actual value
input (in %)
100 100 %
A21
Digitally adjustable setpoint value 1 300 300 m
3
/min
A71
PID control active/inactive 01 PID mode active
A72
P component of the PID controller – Application dependent
A73
I component of the PID controller –
A74
D component of the PID controller –
A75
Setpoint factor of the PID controller 5.0 100 % at 500 m
3
/min
A76
Input actual value signal for PID controller 00 Feedback from OI–L terminal
w
B1
P1
x
4 – 20 mA
G1
a
M
3
~
500 m
3
/min
300 m
3
/min
150 m
3
/min
100
20 mA
4 mA0
100 %
20 %
10.6 mA
53 %
60
30
5.8 mA
29 %
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