ABB REU 610 Technical Reference Manual page 106

REU 610
TX
X5.3
RX
TX
X5.4
RX
Fig. 5.2.1.-1 Rear view of the relay with the fibre-optic communication module for plastic and glass fibre
106
Voltage Relay
Technical Reference Manual
The IRF contact functions as an output contact for the self-supervision system of the
voltage relay, see Table 5.2.1.-3. Under normal operating conditions, the relay is
energized and the contact is closed (X4.1/3-5). When a fault is detected by the self-
supervision system or the auxiliary voltage is disconnected, the output contact drops
off and the contact closes (X4.1/3-4).
Fig. 5.2.1.-1 ...Fig. 5.2.1.-3 present a rear view of the relay, showing four
connecting sockets: one for measuring transformers, one for the optional I/O
module, one for power supply and one for optional serial communication.
X3.1
X4.1
1 1
2 2
3 3
4 4
5 5
6 6
7 7
8 8
9 9
10 10
11 11
12 12
13 13
14 14
15 15
16 16
17 17
18 18
19 19
20 20
21 21
22 22
23 23
24 24
X2.1
1MRS755769
A051555