ABB Relion 620 Series - Page 127

X110
+
-
5
6
15
16
...
...
...
Transducer
Sensor
Shunt
(44 Ω)
...
...
...
Figure 49: mA wiring connection for 6RTD/2mA card
2RTD/1mA card
This type of card accepts one milliampere input, two inputs from RTD sensors and
five inputs from VTs. The Input 1 is assigned for current measurements, inputs 2
and 3 are for RTD sensors and inputs 4 to 8 are used for measuring input data from
VT.
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
X130
mA
mA
RTD1
+
-
+
-
+
-
1
2
3
4
6
7
8
RTD2
5
Figure 50: Two RTD and resistance sensors connected according to the 3-wire
connection for RTD/mA card
1MRS757644 H
Basic functions
620 series
Technical Manual
127