System Status Led Indicators - GE 750 Instruction Manual

LED Indicators
System Status LED
Indicators
NOTE
GE Multilin
• SETPOINT GROUP 1 to 4: These indicators are flashing if the corresponding
group is selected for editing and/or display; they are continuously on if the
corresponding group is providing settings for the protection elements.
• BREAKER OPEN: When the breaker is open, this indicator will be on
continuously.
• BREAKER CLOSED: When the breaker is closed, this indicator will be on
continuously.
Breaker status indication is based on the breaker 52a and 52b contacts. With
both contacts wired to the relay, the closed status is determined by a closed 52a
contact and the open status is determined by a closed 52b contact. If both 52a
and 52b contacts are open, due to a breaker being racked out of the switchgear,
both the Breaker Open and Breaker Closed LED Indicators will be off.
With a single 52a contact, it is impossible to distinguish between a breaker open
state and a racked out breaker. In both situations, the 52a contact will be open.
With a single 52b contact, you cannot distinguish between a breaker closed
state and a racked out breaker. Likewise, the 52b contact will be open for both
situations. To clarify this ambiguity, the breaker connected function should be
programmed to an additional logic input. When this additional input is closed, a
single 52a or 52b contact will show both breaker states. When the breaker is
racked out, this additional breaker connected input should be open. In this case,
both breaker status indicators will be off.
The Open and Closed Status Indicator colors are interchangeable at the
time of placing a 750/760 order.
• RECLOSURE ENABLED (760 only): This indicator will be on continuously
when autoreclosure is allowed to operate as programmed. This is when the
autoreclose function setpoint is enabled, and if used, the block reclosure logic
input is not asserted. Otherwise, this indicator will be off. Note that this
indicator will always be in the opposite state of the Reclosure Disabled LED
Indicator.
• RECLOSURE DISABLED (760 only): This indicator will be on continuously
when autoreclosure is not allowed to operate as programmed. This is when the
autoreclose function setpoint is disabled, or if used, the block reclosure logic
input is asserted. Otherwise, this indicator will be off. Note that this indicator
will always be in the opposite state of the Reclosure Enabled LED.
• RECLOSURE IN PROGRESS (760 only): If a trip initiates a reclosing
sequence, this indicator will go on continuously during each of the programmed
dead times.
• RECLOSURE LOCKOUT (760 only): If the programmed reclose sequence has
progressed to a final lockout condition, this indicator will be on continuously.
Lockout can be cleared by performing a reset.
• LOCAL: This indicator turns on if the local mode function has been assigned a
logic input which is asserted. In local mode, the front panel OPEN and CLOSE keys
operate while the Remote Open and Remote Close logic input functions will not
operate. As well, the communication open and close commands have no effect.
Breaker operations performed by 750/760 outputs in response to logic inputs
energized with contacts from a local control switch are considered as remote
operations. When the 750/760 is in local mode, the local panel is the relay
faceplate; everything else is considered remote, even the control switch that
might be installed in the same switchgear compartment. It is important not to
confuse this with the concept of Station Local/Remote Mode, in which case the
same Control Switch is considered local.
• MESSAGE: Under normal conditions, the default messages selected during
setpoint programming are displayed. If any alarm or trip condition is generated,
a diagnostic message overrides the displayed message and this indicator
flashes. If there is more than one condition present, MESSAGE
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750/760
Feeder Management Relay
can be used to
4–3