1MRS 752179-MUM
Earth-Fault Relay
Operator’s Manual
REJ 521
23
)LJ $ODUP
A latching alarm indication message will remain on the display until manually
cleared or until replaced by a message of higher priority. However, if the fault is
stable and has not disappeared, the LED(s) will not be cleared. An alarm indication
generated by a non-latching start will automatically be cleared when the stage is
reset.
Priority of alarm indication messages
The messages on the display have a certain priority order. If different types of
indications are activated simultaneously, the message with the highest priority will
appear on the display. The priority order of the messages is:
1. CBFP
2. TRIP
3. START
When both protection stages start but do not trip, the last start indication message
will be displayed. When both protection stages trip, the first trip indication message
will be displayed until the time, as specified by the “NEW TRIP IND.” setting value,
has expired. After this, a new trip indication message can displace the old one.
3.3.2.2. Disturbance recorder indication
When the display is in the idle mode, an asterisk “*” indicating that the disturbance
recorder has been triggered and is ready to be unloaded will be shown in the lower
right-hand corner on the display.
3.3.2.3. Internal fault
When the self-supervision system detects a permanent internal relay fault, the
READY indicator LED will start to blink. At the same time the self-supervision
alarm relay, which is normally picked up, will drop off and a fault code will appear
on the display. The fault code is of a numerical kind and identifies the fault type.
Record the fault code and state it when ordering service.
If an internal fault disappears, the fault message will remain on the display until
manually cleared or until replaced by an alarm indication message.
Alarm_521
C
E
ALARM
I0>> I0
STARTREADY TRIP
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