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MN04020001E
Analog inputs
The adjustable frequency drive M-Max has two analog inputs for
specifying the frequency setpoint value and the actual value return
to the PI controller:
GND
• Terminal 2 (AI1), voltage signal 0 (2) – +10 V,i
input resistor 200 kO
• Terminal 4 (AI2), current signal 0 (4) – 20 mA,
load resistor 200 O
Adjusting and the parameter definition of analog inputs are
described in section "Analog input (P2)", page 73.
The analog input AI1 (Terminal 2) has default setting for the
frequency setpoint value (P6.2). The setpoint input can be done via
an external potentiometer for instance (recommended fixed
resistance 1 kO to 10 kO). The fixed resistance of the setpoint
potentiometer is supplied by the adjustable frequency drive via
terminal 1 with +10 V (maximum load rating: 10 mA). Reference
point (GND) for the analog setpoint value signals are terminals 3,
5, 7 or 13.
AO
< 500 O
Figure 38: Analog setpoint value signal – e. g. from a superordinate
controller (PLC)
Analog output
On terminal 18, the adjustable frequency drive provides an analog
current signal (4 – 20 mA). This signal is set proportional to the
output frequency in the factory (0 – fmax). Adjustments and
parameter definitions for the analog outputs are described in
section "Analog output (P4)", page 78.
Figure 37: Analog setpoint value inputs AI1 and AI2
Connection example: Potentiometer (4.7 kO)
M22-R4K7; Article No. 229490
18
f-Out
5
AO
< 500 O
GND
18
f-Out
0...+10 V
5
AO
< 10 mA
18
GND
GND
5
f-Out
0 (4)...20 mA
AI2
4
AI1
2
PI-Ist
0 (4)...20 mA
1
200 O
f-Soll
0...+10 V
3
200 kO
+10 V Out
< 10 mA
GND
–
+
2
f-Soll
0...+10 V
3
AI1
200 kO
R Q 500 O
+
+
-
–
0 … +10 V
Figure 39: Analog output AO (connection examples)
You can shape the current signal into a proportional voltage signal
with a load resistor (500 O, 0.25 W). Note: Instead of 500 O, you
can also connect two 1 kO (Standard value) resistors with
0.125 W each in parallel.
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