Setting parameters
10/05 AWB8230-1541GB
138
Temperature control
With the flow control in the previous example, the frequency
inverter’s output frequency increases if the feedback signal is less
than the reference value and falls if the feedback signal is greater
than the reference value. With temperature control, the opposite
behaviour must be implemented: if the temperature is above the
reference value, the inverter must increase its output frequency to
increase the speed of the connected fan.
The following figure contains an example for temperature control
with the two reference values 20 and 30 °C:
Figure 144:Example of temperature control
w: Reference value, 10-bit digital
x: Feedback actual value (50 °C at 10 V)
T2: Measuring transducer
P1: Temperature sensor
a Fan
PNU
Meaning in PID control mode Value Notes
F01 Reference value 20 Direct input of “20 °C”, as the scaling
factor has been set
A01 Frequency reference value definition 02 Keypad
A11
Feedback percentage actual value for lower acceptance threshold (units:
%)
100 100 %
A12
Feedback percentage actual value for upper acceptance threshold (units:
%)
0 0%
A13 Lower acceptance threshold for voltage or current on the actual value
input (in %)
0 0%
A14 Upper acceptance threshold for voltage or current on the actual value
input (in %)
100 100 %
A21 Digitally adjustable reference value 1 30 30 °C
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 0.5 100 % at 50 °C
A76 Input actual value signal for PID control 01 Feedback from O-L terminal
w
T2
P1
x
0 ... +10 V H
T1
a
M
3
~
100%
0
4 V
40 %
10 V
100 %
60%
40%
6 V
60 %
20 °C
50 °C
30 °C
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