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5.1.1.6. 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 indication 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 are always stored in the EEPROM. The
EEPROM does not require battery backup.
5.1.1.7. 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 indications:
internal relay fault (IRF) indications and warnings.
When the self-supervision system detects a permanent internal relay fault, which
prevents relay operation, the green indicator LED (ready) will blink. At the same
time, the IRF contact (also referred to as the IRF relay), which is normally picked
up, drops off and a fault code appears on the LCD. The fault code is numerical and
identifies the fault type.
INTERNAL FAULT
FAULT CODE :30
A040278
Fig. 5.1.1.7.-1 Permanent IRF
In case of a warning, the relay continues to operate with full or reduced functionality
and the green indicator LED (ready) remains lit as during normal operation. A fault
indication message (see Fig. 5.1.1.7.-2), with a possible fault code (see
Fig. 5.1.1.7.-3), appears on the LCD indicating the type of fault. In case of a
warning due to an external fault in the trip circuit detected by the trip-circuit
supervision, or due to continuous light on the light sensor inputs, SO2 is activated
(if SGF1/8=1).
WARNING
BATTERY LOW
A040279
Fig. 5.1.1.7.-2 Warning with text message
Feeder Protection Relay
Technical Reference Manual
REF 610REF 610
1MRS755310
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