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12.9 Operating range
Set the operating range as follows:
•
Set the minimum speed within the range from
fixed minimum speed to user-set maximum
speed.
•
Set the maximum speed within the range from
user-set minimum speed to fixed maximum
speed.
The range between the user-set minimum and
maximum speeds is the operating range. See fig. 21.
100 %
Fixed maximum speed
User-set maximum speed
67 %
Operating range
User-set minimum speed
24 %
13 %
Fixed minimum speed
0 %
Fig. 21
Example of minimum and maximum
settings
12.10 External setpoint function
You can influence the setpoint by an external signal
via the analog input.
Before you can enable the function, you
must set the analog input to External
setpoint function.
See sections
12.6 Analog inputs
12.7 Digital
inputs.
Example with constant pressure with linear
influence
Actual setpoint: actual input signal x (setpoint -
sensor min.) + sensor min.
At a sensor min. of 0 bar, a setpoint of 2 bar and an
external setpoint of 60 %, the actual setpoint is 0.60
x (2 - 0) + 0 = 1.2 bar. See fig. 22.
[bar]
Sensor
max.
Setpoint
2
100
Actual
1.2
setpoint
Sensor
0
0
0
min.
0.5
0
0
0
4
-50
Fig. 22
Example of setpoint influence with
sensor feedback
20
and
Actual
External
100 %
3.5 V
input
setpoint
5 V
signal
signal
10 V
20 mA
(60 %)
20 mA
204 C
Example with constant curve with linear
influence
Actual setpoint: actual input signal x (setpoint -
user-set minimum speed) + user-set minimum
speed.
At a user-set minimum speed of 25 %, and a setpoint
of 85 % and an external setpoint of 60 %, the actual
setpoint is 0.60 x (85 - 25) + 25 = 61 %. See fig. 23.
Speed [%]
100
Setpoint
85
Actual
61
setpoint
User-set
25
min.
speed
0
Actual
0
0.5
0
0
0
(60 %)
4
-50
Fig. 23
Example of setpoint influence with
constant curve
12.10.1 "Setpoint influence" functions
You can select these functions:
•
Not active.
When set to Not active, the setpoint is not
influenced from any external function.
•
Linear function.
The setpoint is influenced linearly from 0 to 100
%. See fig. 24.
Setpoint influence [%]
100
0
0
0.5
0
0
0
4
-50
Fig. 24
Linear function
Fixed
maximum
speed
External
100 %
3.5 V
input
setpoint
5 V
signal
signal
10 V
20 mA
20 mA
204 C
External
100 %
3.5 V
input
5 V
10 V
20 mA
20 mA
204 C
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