ABB ACH580-01 - Connection for Obtaining 0; Connection Examples of Two-Wire and Three-Wire Sensors

WARNING!
Do not connect the +24 V AC cable to the control unit ground when the control
unit is powered using an external 24 V AC supply.
Connection for obtaining 0…10 V from analog output 2 (AO2)
To obtain 0…10 V from analog output AO2, connect a 500 ohm resistor (or two 1 kohm
resistors in parallel) between the analog output 2 AO2 and analog common ground
AGND.
Examples are shown in the figure below.
500 ohm
0…10 V
1 kohm 1kohm
0…10 V
X1
8AO2
9AGND
X1
8AO2
9AGND
AO2. Analog output 2. Default output 0…20 mA.8
AGND. Analog common ground. Internally connected to chassis through a 2 Mohm resistor.9
Connection examples of two-wire and three-wire sensors
Note: Maximum capability of the auxiliary 24 V DC (250 mA) output must not be
exceeded.
Two-wire sensor/transmitter
X1
5AI2
6AGND
…
10 +24V
11 DGND
4…20 mA
+
-
P
I
Process actual value measurement or reference, 0(4)…20 mA, R
in
= 100 ohm
AI25
AGND6
Auxiliary voltage output, non-isolated, +24 V DC, max. 250 mA+24V10
DGND11
Three-wire sensor/transmitter
192 Electrical installation – North America