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M-LIB3 Low Impedance Bus Differential Relay
26
6.6 SIGNALIZATIONS
Eight signal LEDs (normally off) are provided:
a) Red LED
dA>
q Flashing when I
d
A > [I
ds
].
q Illuminated on tripping of the biased differential element : I
d
A > I
S
b) Red LED
dB>
q Flashing when I
d
B > [I
ds
].
q Illuminated on tripping of the biased differential element : I
d
B > I
S
c) Red LED dC>
q Flashing when I
d
C > [I
ds
].
q Illuminated on tripping of the biased differential element : I
d
C > I
S
d) Red LED
dvs
q Flashing during supervision time delay
q Illuminated on tripping of the CT’s Supervision element.
e) Yellow LED
PROG/
I.R.F.
q Flashing during the programming of the parameters or in case of
Internal Relay Fault.
f) Red LED
Remote
Trigger
q Illuminated when the oscillography trigger input is activated
g) Red LED
Time
Sync.
q Illuminated when synchronization input is active
h) Yellow LED
BLOCK
INPUT
q Flashing when digital input B1 is activated
The reset of the LEDs takes place as follows
q
From flashing to off, automatically when the lit-on cause disappears.
q
From ON to OFF, by "ENTER/RESET" push button only if the tripping cause has disappeared.
In case of auxiliary power supply failure the status of the LEDs is recorded and reproduced when power supply
is restored.
dB>
PROG/
I.R.F.
BLOCK
INPUT
a b c d
e
f
g h
REMOTE
TRIGGER
TIME
SYNC.
dvs
dC>
dA>