ABB RELION 620 Series Technical Manual page 114

Section 3
Basic functions
108
2RTD/1mA/3SO card has one milliampere input, two inputs from RTD sensors and three
signal outputs. The Input 1 is assigned for current measurements, inputs 2 and 3 are for
RTD sensors and outputs 4,5,6 are used signal outputs.
RTD/mA input connections
The examples of 3-wire and 2-wire connections of resistance and temperature sensors to
the 2RTD/1mA board are as shown:
Resistor sensor
GUID-9233377B-F015-46E7-A0D9-2B580F436B2E V2 EN
Figure 37: Two RTD and resistance sensors connected according to the 3-wire
connection for RTD/mA card
1MAC504801-IB E
X130
+
mA
1
mA
-
2
+
3
RTD1
-
4
5
+
6
RTD2
-
7
8
620 series ANSI
Technical Manual