ABB REF601 Applications Manual page 28

Section 4
Protection and Control Function
22
Table 15: LED indications (on relay front)
Trip (RED) Common trip LED for overcurrent and earth fault trip indication
Trip Ip (RED) Trip LED for overcurrent faults (I>, I>> and I>>>)
Trip Io (RED) Trip LED for earth faults (Io> and Io>>)
Start (Yellow) Start LED for any protection function start
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
TCS Fault LED indicates that trip circuit has failure
Table 16: Trip and signaling contacts
BO1 Default as Trip1 contact for O/C and E/F. Under relay healthy condition, this
contact will remain open. In the event of trip/breaker open command, it will
close.
BO2 Default as Trip2 contact for breaker open output. In the event of fault (O/C and
E/F) / breaker open command, it will close
BO3 Default as contact for Breaker close command. This contact will close, when
breaker close command is received either from relay HMI or through
communication.
BO4 Non-configurable signaling contact for Unit ready / internal relay fault indication.
Under relay healthy condition this will be in close condition. During internal fault
this will open
BO5 Default as signaling contact over current trip. In the event of phase faults (I>, I>>
and I >>>) it will close and remain latched
BO6 Default as signaling contact earth fault trip. In the event of earth faults (Io> and
Io>> it will close and remain latched
1MDU07212-YN Rev. A
)
REF601 / REJ601
Application Manual