Lucent Lineage
®
2000 ECS Battery Plant H569-408
Issue 2 July 1996
Maintenance 4- 5
Open
Distribution
Breaker
A distribution breaker which should be closed may be in the
open position for one of the following reasons:
•
A distribution breaker may have been inadvertently turned
off manually. If this is the case, follow the proper
procedure to restore power to the load equipment. If a
distribution breaker is no longer needed, it may be
unplugged from the panel or left in the OFF position.
•
A distribution breaker may trip due to a short circuit in the
load equipment or wiring. The fault must be cleared before
resetting the breaker, except when the trip is suspected to
be caused by inrush current during equipment start up.
•
A circuit breaker may fail such that it cannot be reset.
Replace a failed distribution breaker as described in
paragraph “Load Circuit Breaker Replacement” below.
Red LVD OPEN
LED Lit
A lit red “LVD OPEN” LED indicates that the LVD Contactor
is de-energized, i.e., open. The contactor may be open due to one
of the following reasons:
•
Plant voltage is below the disconnect threshold.
•
The contactor has failed and must be replaced. See
procedure “LVD/R Contactor Replacement” below.
•
There is an open circuit in the wiring that powers the
contactor. Check the cable assembly from CP5 to the
contactor (see drawing T-82670-30).
•
Both redundant LVD sensing circuits have failed. Replace
the CP5 circuit pack per procedure “LVD/Fuse Board
(CP5) Replacement” below.
Yellow LVD
FAIL LED Lit
A lit yellow “LVD FAIL” LED indicates that one or both of the
LVD circuits has attempted to open the contactor, but the
contactor is closed. This may occur due to one of the following
reasons:
•
The plant voltage is right at the disconnect level and is
within tolerances of the redundant detector circuits, but
only one detector has operated. No action is required.
•
The LVD circuit has partially failed. Replace the CP5
circuit pack per procedure “LVD/Fuse Board (CP5)
Replacement” below.
