ABB REJ 521 - Red Indicator LED; Indication Messages; Alarm Indication Messages

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1MRS 752179-MUM
Earth-Fault Relay
Operator’s Manual
REJ 521
• Lit indicator:
A protection stage has started. The start indication can be selected to be latching
or non-latching with the SGF switches. A non-latching indication will
automatically be cleared when the fault has disappeared and the protection stage
has been reset whereas a latching indication will remain lit until manually
cleared.
• Blinking indicator:
Starting protection stages have been blocked by an external binary input signal.
The blocking indication is non-latching, i.e. it will disappear with the binary
input signal.
The START indicator LED will continue blinking for as long as a protection
stage remains blocked. The blocking indication will disappear with the binary
input signal or when the protection stage is no longer starting.
If a protection stage is blocked when other protection stages are starting, the
indicator will continue blinking. (Blocking has a higher priority than starting.)
3.3.1.3. Red indicator LED
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TRIP indicator
• Indicator off:
No protection stage has tripped.
• Lit indicator:
A protection stage has tripped. The trip indication is latching, i.e. it will remain
lit until manually cleared.
3.3.2. Indication messages
The messages give an overview of protection operations and internal protection
relay faults.
3.3.2.1. Alarm indication messages
In case of a start or a trip of a protection stage, the text “ALARM” will appear on the
display along with the name of the function. Additionally, in case of a latching start
or trip indication also the name of the energizing input will be displayed. The
START indicator LED and/or the TRIP indicator LED will also be lit.
Red
STARTREADY TRIP