Setting Parameters
09/01 AWB8230-1412GB
88
Internal regulator-based calculations
All calculations within the PID algorithm are carried out in percen-
tages, so that different physical units can be used, such as
• Pressure (N/m
2
),
• Flow rate (m
3
/min),
• Temperature (°C), etc.
The setpoint and returned actual values can, for example, also be
compared as percentages.
A useful scaling function (PNU A75) is also available. When these
parameters are used, you can define the setpoint directly as the
required physical quantity and/or display setpoint and actual
values as physical quantities suitable for the process.
Additionally, analog signal matching (PNU A11 to A14) is avai-
lable, with which a range based on the actual value feedback can
be defined. The following graphs illustrate the mode of operation
of this function.
PNU Function Adjustable in
RUN mode
Value Function WE
A01 Defined
frequency
setpoint
– 00 Definition with the potentiometer on the keypad 01
01 Definition via analog input O (0 to 10 V) or OI (4 to 20 mA)
02 Definition under PNU F01 and/or PNU A20
A11 Frequency with
minimum
setpoint value
– 0 to 360 Hz Here, the frequency that corresponds to the minimum voltage setpoint
value under PNU A13 is set.
0.0
A12 Frequency with
maximum
setpoint value
– 0 to 360 Hz Here, the frequency that corresponds to the maximum voltage setpoint
value under PNU A14 is set.
0.0
A13 Minimum
setpoint value
– 0 to 100 % The minimum setpoint value entered here relates to the maximum
possible voltage or current setpoint (10 V or 20 mA).
0
A14 Maximum
setpoint value
– 0 to 100 % The maximum setpoint value entered here relates to the maximum
possible voltage or current setpoint (10 V or 20 mA).
100
d04 Actual value x
factor
j – Only with active PID closed loop control. The factor is set under
PNU A75, from 0.01 to 99.99; default setting = 1.0.
–
F01 Input/display
frequency value
j 0.5 to 360 Hz Resolution g0.1 Hz
The setpoint can be defined using various methods:
• With PNU F01 or A20: Enter the value 02 under PNU A01.
• With the potentiometer on the keypad: Enter the value 00 under
PNU A01.
• With a 0 to 10 V voltage signal or a 4 to 20 mA current signal at input
terminals O or OI: Enter the value 01 under PNU A01.
• With the digital inputs configured as FF1 to FF4. After selection of the
required fixed frequency stage using FF1 to FF4, the frequency for the
respective stage can be entered.
The display of the setpoint value is independent of which method was
used to set the setpoint value.
0.0
A72 P component of
the PID controller
j 0.2 to 5.0 Adjustment range of the proportional component of the PID closed loop
control
1.0
A73 I component of
the PID controller
j 0.0 to 150 s Adjustment time T
i
of the integral component of the PID closed loop
control
1.0
A74 D component of
the PID controller
j 0.0 to 100 s Adjustment time T
d
of the differential component of the PID closed loop
control
0.0
A75 Setpoint factor of
the PID controller
– 0.01 to 99.99 The display of the frequency setpoint or actual value can be multiplied
by a factor, so that process related quantities (e.g. flow or similar) can
be displayed instead of the frequency.
1.00
A76 Input actual
value signal for
PID controller
– 00 Actual value signal present on analog input OI (4 to 20 mA) 00
01 Actual value signal present on analog input O (0 to 10 V)
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