Setting Parameters
01/02 AWB8230-1413GB
122
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
terminals, define the required setpoint value through 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 selection (FF1 to FF4)”, page 68).
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, you can select one of the two methods.
To adapt the PID control to the respective application, the actual
value feedback signal can also be matched as shown in figure 123:
As evident from 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 123: Matching the analog actual value signal
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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