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Setting Parameters
01/02 AWB8230-1415GB
140
Setpoint definition
There are three ways of defining the setpoints:
• Keypad
• Digital control signal terminal input (4 bit)
• Analog input (terminals O–L or OI–L)
If the digital setpoints are defined through the control signal termi-
nals, define the required setpoint value in PNU A021 to A035. The
setting procedure is similar to the one which is used in frequency
regulation mode (i.e. with deactivated PID control) for setting the
respective fixed frequencies (
a
Section “Fixed frequency selec-
tion (FF1 to FF4)“, Page 69).
Actual value feedback and actual value signal matching
You can specify the actual value signal as follows:
• With an analog voltage on control signal terminal O
(maximum 10 V)
• With an analog current on control signal terminal OI
(maximum 20 mA)
With PNU A076, select one of the two available methods.
To adapt the PID control to the respective application, the actual
value feedback signal can also be matched as shown in
Figure 141:
As shown by the graphs, the setpoint value must be within the
valid range on the vertical axis if you have set functions PNU A011
and A012 to a value not equal to 0. Because there is no feedback
signal, stable control cannot otherwise be guaranteed. This means
that the frequency inverter will either
• output the maximum frequency,
• go to stop mode, or
• output a lower limit frequency.
PNU A013 = 20 %
PNU A014 = 100 %
PNU A013 = 0 %
PNU A014 = 50 %
PNU A013 = 25 %
PNU A014 = 75 %
PNU A013 = 20 %
PNU A014 = 100 %
PNU A011 = 25 %
PNU A012 = 100 %
PNU A013 = 0 %
PNU A014 = 50 %
PNU A011 = 0 %
PNU A012 = 75 %
PNU A013 = 25 %
PNU A014 = 75 %
PNU A011 = 25 %
PNU A012 = 75 %
Figure 141: Analog actual value signal matching
100
0
10 V
2 V
20 mA
4 mA
100 %
20 %
[%]
f
100
0
10 V
5 V
20 mA
10 mA
100 %
50 %
[%]
f
100
0
10 V
2.5 V
20 mA
5 mA
100 %
25 %
7.5 V
15 mA
75 %
[%]
f
100
0
10 V
2 V
20 mA
4 mA
100 %
20 %
25
[%]
f
100
0
10 V
5 V
20 mA
10 mA
100 %
50 %
75
[%]
f
100
0
10 V
2.5 V
20 mA
5 mA
100 %
25 %
7.5 V
15 mA
75 %
25
75
[%]
f
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