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Connection examples of two-wire and three-wire
sensors
Many ACH550 applications use process PI(D) and need a
feedback signal from the process. The feedback signal is
typically connected to analogue input 2 (AI2).
The macro wiring diagrams for each macro earlier in this chapter
use an externally powered sensor (connections not shown). The
figures below give examples of connections using a two-wire or
three-wire sensor/transmitter supplied by the drive auxiliary
voltage output.
Two-wire sensor/transmitter
-
P
+
I
Note: The sensor is supplied through its current output and the
drive feeds the supply voltage (+24 V). Thus the output signal
must be 4...20 mA, not 0...20 mA.
Three-wire sensor/transmitter
OUT
P
-
I
+
124
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X1 / control board
4...20 mA
5 AI2
6 AGND
...
X1 / control board
10 +24 V
11 GND
X1 / control board
0(4)...20 mA
5 AI2
6 AGND
...
X1 / control board
10 +24 V
11 GND
ACH550-01 User's Manual
Process actual value measurement,
4 ... 20 mA, R
= 100 ohm
in
Auxiliary voltage output, non-isolated,
24 V DC, 250 mA
Process actual value measurement,
0(4) ... 20 mA, R
= 100 ohm
in
Auxiliary voltage output, non-isolated,
24 V DC, 250 mA
Application macros and wiring
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