10/05 AWB8230-1541GB
PID control
137
Application examples
This section contains a few setting examples.
Flow control
In the example shown in the figure below, the reference values are
150 m
3
/min and 300 m
3
/min:
Figure 143:Examples for flow control
w: Reference value, 10-bit digital
x: Feedback actual value (500 m
3
/min at 20 mA)
T2: Measuring transducer
P1: Flow sensor
a Pump
PNU
Meaning in PID control mode Value Notes
F01 Reference value 150 Direct input of “150 m
3
/min”, since the
scaling factor has been set
A01 Frequency reference value 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 reference value 1 300 300 m
3
/min
A71
PID control active/inactive 01 PID mode active
A72 P component of the PID control – Application-dependent
A73 I component of the PID control –
A74 D component of the PID control –
A75 Reference value factor of the PID control 5.0 100 % at 500 m
3
/min
A76 Input actual value signal for PID control 00 Feedback from OI-L terminal
w
T2
P1
x
4 ... 20 mA
T1
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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