1MDU07205-YN rev. F
REF601 CEI
User’s manual
31
o Unit ready / Signaling contact for Unit ready / internal relay fault
IRF indication. Under relay healthy condition this will be in close
. condition. During internal fault this will open
o Trip 2 / Breaker open
o Breaker close
The signaling contacts can be reset to normal default conditions by proper reset
command. Reset command can be given by push buttons or by binary input or
through communication interface.
Contact for Breaker open output. This contact will operate
i.e. changeover to NC , when healthy Breaker open command
is received. It also activate in case of valid trip condition and
valid remote opening command.
Contact for Breaker close command. This contact will
operate i.e. changeover to NC , when healthy Breaker close
command is received.
Protection Functions
Binary input: •
o Remote Trip Remote trip command to breaker
o Remote reset Remote reset command for resetting indications and
contacts
LED indications (on relay front) •
o Trip (RED) Common trip LED for overcurrent and earth fault
trip indication
o Trip Ip (RED) Trip LED for overcurrent faults (I>, I>> and I>>> )
o Trip Io (RED) Trip LED for earth faults (Io> and Io>>)
o Start (Yellow) Start LED for any protection function start
o Ready (Green) LED indicates that relay has no internal fault and is
powered up for desired functionality
It glows after internal health check after power on and continue to glow until power
goes off or there is internal fault in the relay
Trip and Signaling contacts •
o Trip 1 Trip contact for O/C and E/F. Under relay healthy
condition, this contact will remain closed. In the event of
trip, it will open.
o O/C Trip signal Signaling contact over current trip This will operate
i.e. changeover to NC, for phase faults (I>, I>> and I>>>)
o E/F Trip signal Signaling contact earth fault trip This will operate
i.e. changeover to NC, for earth faults (Io> and Io>>)
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