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Figure 4. Process reference set with external signal.
3-Phase Input
Process reference value
DC: 5 V (0 – 10 V)
Process feedback
DC: 4 – 20 mA
Note:
On the 9-Series ASD, set SW301 to either Current or Voltage as the feedback signal
type. SW301 is located on the Terminal Board of the 9-Series ASD. See the ASD
Operation Manual.
Figure 5. Feedback and Process reference signal frequency conversion.
Process feedback
20 psi
15 psi
10 psi
4 mA
20 mA
Feedback Value (4 – 20 mA)
4
8
12
16
20
Note:
To simplify this example the Upper Limit Frequency (F012) was set to the Maximum
Frequency (F011). For real applications it is good practice to set the Upper Limit
Frequency lower than the Maximum Frequency.
PID Control Manual
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R
S
T
RR
CC
V/I
IICC
Process feedback
(converted into frequency)
20 psi
80 Hz
0 Hz
10 psi
4 mA
20 mA
Process Value (0 – 10 V)
0
2.5
5.0
7.5
10
U
M
V
Pressure
W
P
Pump
Process reference value
80 Hz
40 Hz
0 Hz
0 V
10 V
Operation Frequency Command
Value (0 – 80 Hz)
0
20
40
60
80
sensor
Desired process
value: 15 psi
Sensor Range:
10 - 20 psi
Process reference value
(converted into frequency)
0 V
5 V
10 V
3
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