01/02 AWB8230-1413GB
PID control
123
Scaling adjustment
Scaling adjustment and scaling allow the setpoint and actual value
to be displayed and the setpoint value to be entered directly in the
correct physical unit. For this purpose, 100 % of the returned
actual value is taken as a basis. By default, inputs and displays are
based on 0 to 100 %.
Example: In the first diagram in figure 123, 20 mA of the feedback
signal correspond to 100 % of the PID internal factor. If for
example the flow rate is currently 60 m
3
/min with a feedback
signal of 20 mA, the parameter is set to 0.6 (= 60/100) with
PNU A075. With PNU d004, the process corrected value can be
displayed and the setpoint value can be entered directly as a
process corrected quantity.
Summary of the relevant parameters
The DF6 frequency inverters use the same parameters for both
frequency control and PID modes. The designations of the
respective parameter relate only to frequency control mode, as this
mode is used in most cases. When PID mode is used, some of the
parameters have other designations.
The table below contains an explanation of these parameters for
both frequency control mode and PID mode:
Factory default setting
PNU A075 = 0.6
Figure 124: Example for scaling adjustment
w: Setpoint
x: Returned actual value
a
Fan
w [%]
PNU F001
= 0 – 100 %
PNU d001
= 0 – 100 %
B1
P1
x
4 – 20 mA
G1
a
M
3
~
w [%]
PNU F001
0 – 60m
3
/min
PNU d001
0 – 60m
3
/min
B1
P1
x
4 – 20 mA
G1
a
M
3
~
PNU
Meaning of the parameters when used in
frequency control mode
PID mode
d004
–
Indication of the returned actual value
F001
Indication of the output frequency
Indication of the setpoint value
A001
Definition of frequency setpoint value
Setpoint definition
A011
Frequency at minimum setpoint value (units: Hz)
Feedback percentage actual value for lower acceptance
threshold (units: %)
A012
Frequency at maximum setpoint value (units: Hz)
Feedback percentage actual value for upper acceptance
threshold (units: %)
A013
Minimum setpoint value (units: Hz)
Lower acceptance threshold for voltage or current on the
actual value input (units: %)
A014
Maximum setpoint value (units: Hz)
Upper acceptance threshold for voltage or current at the
actual value input (units: %)
A021 to A035
Fixed frequencies 1 to 15
Digital adjustable setpoint values 1 to 15
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