Lucent Technologies Lineage
®
2000 ECS Battery Plant J855003D-3
5 - 4 Maintenance
Issue 5 January 1999
3. A circuit breaker may fail such that it cannot be reset.
Replace a failed distribution breaker as described below,
“Load Circuit Breaker Replacement.”
Red LVD OPEN
LED Lit
The Red LVD OPEN LED indicates that the LVD Contactor is
de-energized, i.e. open. The contactor may be open due to one of
four reasons:
1. Plant voltage is below the disconnect threshold.
2. The contactor has failed and must be replaced. See section
on LVD/R Contactor Replacement under Repair and
Replacement, below.
3. There is an open circuit in the wiring that powers the
contactor. Check the cable assembly from the LVD/Fuse
Board to the contactor (see drawing T-82670-30).
4. Both redundant LVD sensing circuits have failed. The
LVD/Fuse circuit pack must be replaced. See section on
LVD/Fuse Board (CP5) Replacement under Repair and
Replacement, below.
Yellow LVD
FAIL LED Lit
The 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 in two situations.
1. 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.
2. The LVD circuit has partially failed. Replace the LVD/
Fuse circuit pack. See section on LVD/Fuse Board (CP5)
Replacement under Repair and Replacement, below.
Blown Fuse on
LVD/Fuse Board
Refer to ECS controller manual for trouble shooting procedures.
Note: Replace with fuse of same rating only.
Repair and
Replacement
Notice: Procedures in this section may cause power alarms to
be issued temporarily. Notify the alarm reporting center before
starting any repair procedure.