FUNCTION CHARACTERISTICS
29
NC020 - Manual - 05 - 2022
— LED indicators
Eight LEDs are available.
• One green LED “ON”: if turned on it means that the device is properly working, if flashing the inter-
nal self-test function has detected an anomaly.
• One yellow LED “START” tagged for START of one or more protective elements.
• One red LED “TRIP” tagged for TRIP of one or more protective elements.
• One red LED 1, latched, tagged for TRIP of one or more I>, I>>, I>>>protective elements
• One red LED 2, latched, tagged for TRIP of one or more IN>AL, IN>, , IN>>, IE>, IE>>elements
• One red LED 3, latched, tagged for TRIP of one or more U>, U>>, U>>elements
[1]
• One red LED 4, no latched, tagged for binary input state visualization 52b (CB position)
• One red LED 5, no latched, tagged for Discharge time state TD.
[1]
FUNCTIONS
LED
START TRIP 1 2 3 4 5
Start IN>AL (Start IN>AL)
Trip IN>AL (Trip IN>AL)
Start IN> (Start IN>)
Trip IN> (Trip IN>)
Start IN>> (Start IN>>)
Trip IN>>(Trip IN>>)
Start I> (Start I>)
Trip I> (Trip I>)
Start I>> (Start I>>)
Trip I>> (Trip I>>)
Start I>>> (Start I>>>)
Trip I>>> (Trip I>>>)
Start IE> (Start IE>)
Trip IE> (Trip IE>)
Start IE>> (Start IE>>)
Trip IE>> (Trip IE>>)
Start U> (Start U>)
Trip U> (Trip U>)
Start U>> (Start U>>)
Trip U>>(Trip U>>)
Start U>>> (Start U>)
Trip U>>> (Trip U>>)
Start I<< (Start I<<)
Trip I<< (Trip I<<)
TD State
CB OPEN
CB CLOSED
Note 1 The LEDs 5 lights when the discharge time expires
Start
79 (79 State)
CB CLOSED (52b)
CB OPEN (52a)
50-51 (I>, I>>, I>>> elements)
50N-51N (IE>, IE>> elements)
Trip
Open CB
Close CB
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