Connection Examples Of Two-Wire And Three-Wire Sensors - ABB ACQ550-x1-06A6-2 User Manual

ACQ550-U1 User's Manual

Connection examples of two-wire and three-wire sensors

Many applications use process PI(D) and need a feedback signal from the process.
The feedback signal is typically connected to analog 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
P
I
X1 / control board
4...20 mA
–
5 AI2
+
6 AGND
...
X1 / control board
10 +24 V Auxiliary voltage output, non-isolated,
11 GND
X1 / control board
0(4)...20 mA
OUT
5 AI2
–
6 AGND
+
...
X1 / control board
10 +24 V Auxiliary voltage output, non-isolated,
11 GND
Process actual value measurement,
0(4) ... 20 mA, R = 100 ohm
in
24 V DC, 250 mA
Process actual value measurement,
0(4) ... 20 mA, R = 100 ohm
in
24 V DC, 250 mA
65
Application macros