Green Indication Led; Yellow Indication Led - ABB REJ 527 Operator's Manual

1MRS 751055-MUM
3.3.5.
3.3.6.
Directional or Non-Directional Earth-Fault Relay
Operator's Manual

Green indication LED

READY START TRIP
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Two different functions are embedded in the READY indicator: power on and IRF
(internal relay fault).
• Indicator off:
• The auxiliary voltage is not available.
• Lit indicator:
• The relay is in normal operation, i.e. the CPU operates, no internal faults have
occurred.
• Blinking indicator:
• An internal relay fault has occurred. Refer to section 3.2.2.6.

Yellow indication LED

READY START TRIP
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START indicator
• Indicator off:
• The indicator is off in normal operation mode and when no function has
started.
• Lit indicator:
• A protection function has started. The start indication can be selected to be
latching or non-latching with switches SGF2/4...6.
• A non-latching type of indication goes automatically off when the fault disap-
pears and the protection stage resets. A latching type of indication remains lit,
although the fault disappears, until cleared by pressing the [C] button.
• Blinking indicator:
• Started protection functions are blocked by an external binary input signal. The
blocking indication is non-latching, i.e. it disappears with the binary input sig-
nal.
• The start LED goes on blinking as long as a protection function or stage of the
relay is blocked. The blocking indication disappears when the binary input sig-
nal is removed or when the protection function in question is no longer started.
Should the function still be started when the binary input signal is removed, the
start indication will be activated.
• If a protection function is blocked when other protection functions are started,
but not blocked, the indicator remains blinking; blocking has a higher priority
than starting.
REJ 527
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