Non-Volatile Memory - ABB REU 610 Technical Reference Manual

1MRS755972
5.1.1.6.
5.1.1.7.
Voltage Relay
Technical Reference Manual - ANSI Version

Non-volatile memory

The relay can be configured to store various data in a non-volatile memory,
which retains its data also in case of loss of auxiliary voltage (provided that
the battery has been inserted and is charged). Operation target messages and
LEDs, disturbance recorder data, event codes and recorded data can all be
configured to be stored in the non-volatile memory whereas setting values
and trip counters are always stored in the EEPROM. The EEPROM does not
require battery backup.
Self-supervision
The self-supervision system of the relay manages run-time fault situations
and informs the user about an existing fault. There are two types of fault
targets; internal relay fault (IRF) targets and warnings. Internal relay faults
prevent relay operation. Warnings are less severe faults and continued relay
operation with full or reduced functionality is allowed.
Internal relay fault (IRF)
When the self-supervision system detects a permanent internal relay fault, the
green target LED starts to flash. At the same time, the IRF contact (also
referred to as the IRF relay), which is normally picked up, drops off. The text
INTERNAL FAULT and a fault code appear on the display.
INTERNAL FAULT
FAULT CODE :30
Fig. 5.1.1.7.-1 Permanent IRF
Warning
In case of a less severe fault (warning), the relay continues to operate except
for those protection functions possibly affected by the fault. At this type of
fault, the green target LED remains lit as during normal operation, but the text
WARNING with a fault code or a text message indicating the fault type
appears on the LCD. In case of a warning due to an external fault in the trip
circuit detected by the trip-circuit supervision, SO2 is activated (if SGF1/
8=1).
REU 610
A040278
17