ABB REX 521, Technical Reference Manual, General

Page: 23 / 64

1MRS 751108-MUM Protection Relay
Technical Reference Manual, General
REX 521
23
4.1.12. Serial communication
The protection relay has two serial communication ports, one on the front panel and
the other on the rear panel.
The connector located on the front panel is a standard ABB optical connector that is
intended to be used for setting the parameters of the protection relay. During the
transmission of the parameters, an interface cable is connected between the relay and
the standard RS-232 interface of a PC, running the Relay Setting Tool.
On the rear panel, there is a fibre-optic interface used to connect the protection relay
to a distribution automation system via a SPA, a LON or an IEC 60870-5-103 bus.
4.1.12.1. Optical communication port on the rear panel
The fibre-optic interface on the rear panel contains two optical connectors, Tx
(X3.2) and Rx (X3.3). The connectors are used for interfacing the unit to an optical
fibre bus using either plastic fibre or glass fibre cables. See also Figure 4.1.12.4.-2
for more information about the plastic and glass fibre cables.
INTERNAL FAULT
Relay SO1 15 Protection operative, but the faulty output relay cannot be
controlled
INTERNAL FAULT
Relay SO2 16 Protection operative, but the faulty output relay cannot be
controlled
INTERNAL FAULT
Relay control 20 Protection inoperative. An attempted relay control operation
failed.
INTERNAL FAULT
Relay test 21 Protection inoperative. Two or more relays were found faulty
during test.
INTERNAL FAULT
NOV error 30 Protection operative. Nonvolatile memory error. The corrupted
data cannot be used. May be solved by restoring the factory
settings.
INTERNAL FAULT
EEPROM error 40 Protection inoperative
INTERNAL FAULT
RAM error 50 Protection inoperative
INTERNAL FAULT
IRF error (test) 60 Protection operative
INTERNAL FAULT
Overtemperature 80 Protection operative. The relay has detected an excessive
temperature. May be due to an ambient temperature above
the specified operating limit or an internal fault.
INTERNAL FAULT
Voltage low 24V 131 Protection operative. Output relays do not operate within
specified limits.
INTERNAL FAULT
Volt. high +15V 203 Protection inoperative
INTERNAL FAULT
Volt. high -15V 223 Protection inoperative
INTERNAL FAULT
A/D conversion 253 Protection inoperative
INTERNAL FAULT
Start-up - Protection inoperative. No communication started, menu
navigation disabled.
INTERNAL FAULT
Unspecified 255 Protection operative or inoperative. The fault location cannot
be determined.
Table 4.1.11.2-1 Fault indications
Fault indication
Fault
code
Reason/Action