01/02 AWB8230-1415GB
PID controller
137
Structure and parameters of the PID controller
PID control active/inactive
DV6 frequency inverters can operate in one of the following two
control modes:
• Frequency control active (i.e. PID control inactive)
• PID control active
You can change over between the two modes with PNU A071
(PID control active/inactive).
Frequency control is the standard control method used by many
frequency inverters. A setpoint value is defined by a control unit
(keypad) as an analog voltage or current signal, or through a four
bit wide digital command applied to the control signal terminals.
With PID control, the inverter’s output frequency is controlled by a
control algorithm to ensure that the deviation between the
setpoint and actual value is kept at zero.
Parameter
The following figure illustrates which parameters are effective in
different areas of the PID block diagram. The specified parameters
(for example PNU A072) correspond to the frequency inverter’s
built-in keypad:
PNU Name Adjustable in RUN mode Value Function WE
Normal Extended
A071 PID control
active/inactive
– j 00 PID control is not used (inactive) 00
01 PID control is used (active)
Figure 140: PID control parameters
w: Setpoint value
x: Actual value
f
o
: Output frequency
a Frequency definition with keypad, fixed frequency
b Analog definition with potentiometer, analog inputs, current or
voltage
a
b
P: PNU A072
I: PNU A073
D: PNU A074
PNU A075 PNU d004
f
O
PNU A075
PNU A01
PNU A075
-1
(PNU A076)
w
PNU F001
++
x
–
+
+
0
PNU A013
PNU A011
PNU A012
PNU A014
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