Technical data

1MRS751108-MUM
REX 521
35
Protection Relay
Technical Reference Manual, General
5.1.11.2. Fault indication texts
The table below shows the different fault indication texts that may appear, the
corresponding fault codes and the actions that should be taken. The fault code is only
used for remote control systems connected to the serial communication.
Table 5.1.11.2-1 Fault indications
Fault indication
Fault
code
Reason/Action
INTERNAL FAULT
Relay HSPO1
1 Protection operative, but the faulty output relay cannot be
controlled
INTERNAL FAULT
Relay PO1
7 Protection operative, but the faulty output relay cannot be
controlled
INTERNAL FAULT
Relay PO2
8 Protection operative, but the faulty output relay cannot be
controlled
INTERNAL FAULT
Relay PO3
9 Protection operative, but the faulty output relay cannot be
controlled
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
HMI error
70 Protection operative. The fault indication may not be seen on
the HMI during the fault.
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.