Serial Communication Connections - ABB REU 523 Technical Reference Manual

REU 523
4.2.2.
46
Combined Overvoltage and Undervoltage Relay
Technical Reference Manual
Table 4.2.1-2 Auxiliary supply voltage
Terminal
X2.1-1
X2.1-2
Table 4.2.1-3 Output contacts
Terminal
X2.1-3
X2.1-4
X2.1-5
X2.1-6
X2.1-7
X2.1-8
X2.1-9
X2.1-10
X2.1-11
X2.1-12
Table 4.2.1-4 Internal Relay Fault contact (IRF)
Terminal
X2.1-13
X2.1-14
X2.1-15
Table 4.2.1-5 Binary input BI
Terminal
X2.1-17
X2.1-18

Serial communication connections

The relay is interfaced with a fibre-optic SPA bus by means of the bus connection
module RER 103 via a 9-pole, D-type subminiature 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 relay to another and to the substation level
communication unit, for instance type SRIO 1000M.
Function
Input+
Input-
Function
PO1, closing contact
PO2, closing contact
SO1, common
SO1, NC
SO1, NO
SO2, common
SO2, NC
SO2, NO
Function
Internal relay fault, common
Closed; IRF, or U disconnected
aux
Closed; no IRF, and U connected
aux
Function
Input+
Input-
1MRS 750942-MUM
ABB Automation