Auxiliary Supply - ABB REU 523 Manual

4
Combined overvoltage and undervoltage
relay
rate of 9.6 kbps. The IEC 60870-5-103 proto-
col is used to transfer mesurand and status
data from the slave to the master. Disturbance
recorder data, however, cannot be transferred
using this protocol.
The REU 523 is provided with two serial
communication ports, one on the rear panel
and the other on the front panel.
The REU 523 is interfaced with a fibre-optic
bus by means of the bus connection module
RER 103 via the D9S-type RS-485 connector
on the rear panel of the device. The RER 103
enables the use of either the SPA bus or the
IEC 60870-5-103 communication protocol.
The use of the IEC 60870-5-103 protocol
normally requires the fibre-optic star coupler
RER 125.
The optical PC-connector on the front panel
is used to connect the relay to the CAP 501/
505 setting and configuration tools. The front
interface uses the SPA bus protocol. The opti-
cal PC-connector galvanically isolates the PC
from the relay. Since this connector is stan-
dardized for ABB relay products, only one
connecting cable (ABB art. No 1MKC-
950001-1) will be required.
The REU 523 can also be connected to the
Lon bus using a LON-SPA Gateway.

Auxiliary Supply

The REU 523 requires a secured auxiliary
voltage supply to operate. The internal power
supply of the relay forms the voltages requir-
ed by the relay electronics. The power supply
is a galvanically isolated (flyback-type)
DC/DC converter. When the auxiliary volt-
age is connected, the green LED on the front
panel will be on.
Input voltage ranges are:
• AC range 80...265 V ac, rated
110/120/220/240 V
• DC range 38...265 V dc, rated
48/60/110/125/220 V
The primary side of the power supply is pro-
tected with a fuse located on the PCB of the
relay. The fuse size is 3.15 A (slow).
REU 523
1MRS 751123-MBG