1MRS 750942-MUM
Combined Overvoltage and Undervoltage Relay
Technical Reference Manual
REU 523
49
4.2.2. Serial communication connections
The REU 523 is interfaced with a fibre-optic bus by means of the bus connection
module RER 103 via the D9S-type connector X2 located on the rear panel of the
device. The terminals of the fibre-optic cables are connected to the counter terminals
Rx (Receiver) and Tx (Transmitter) of the bus connection module. The fibre-optic
cables are linked from one protection relay to another and to the substation level
communication unit, e.g. SRIO 1000M and the RER 125.
The optical PC-connection on the front panel of the relay is used to connect the relay
to a fibre-optic SPA bus via opto-cable 1MKC950001-1.
Table 4.2.1-3 Output contacts
Terminal Function
X2.1-3 PO1, closing contact
X2.1-4
X2.1-5 PO2, closing contact
X2.1-6
X2.1-7 SO1, common
X2.1-8 SO1, NC
X2.1-9 SO1, NO
X2.1-10 SO2, common
X2.1-11 SO2, NC
X2.1-12 SO2, NO
Table 4.2.1-4 IRF contact
Terminal Function
X2.1-13 Internal relay fault, common
X2.1-14 Closed; IRF, or U
aux
disconnected
X2.1-15 Closed; no IRF, and U
aux
connected
Table 4.2.1-5 Binary input
Terminal Function
X2.1-17 Input+
X2.1-18 Input-
Table 4.2.2-1 RS-485 connector X2 for the RER 103
Terminal Function
X.2.2-1 Data A (data signal +)
X.2.2-2 Data B (data signal -)
X.2.2-3 RTS A (request to send +)
X.2.2-4 RTS B (request to send -)
X.2.2-5 COL A (2.8 V on relay)
X.2.2-6 COL B (2.2 V on relay)
X.2.2-7 GND
X.2.2-8 NC
X.2.2-9 +5 Vdc, auxiliary voltage (max. 200 mA)
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