Lucent Technologies Lineage
®
2000 ECS Battery Plant J85500D-3
3 - 16 Engineering, Planning and Ordering
Issue 5 January 1999
in battery capacity is tied to the growth in rectifier capacity,
since both must increase with increasing load current. It is
typically most economical to match an increase in charge
capacity with an increase in battery capacity which can back up
the load supported by the additional rectifiers. Since a fraction of
any added rectifier capacity is needed for recharging added
batteries, the matching incremental change in battery capacity
depends on the desired recharge factor. Since the charge
capacity of the Lineage
®
2000 ECS battery plant grows in 50
ampere increments with the SR50A/48V rectifier, the optimum
battery capacity increment may be approximated as follows.
A-hr increment = (50 A) x (reserve time in hours) /
(minimum recharge factor)
System Reliability: In most battery plants it is possible have an
open circuit in the battery subsystem that could remain
undetected until ac power is lost and battery power is required.
Therefore, for applications where service reliability is critical, it
is a good practice to select battery size such that at least two
strings are required. Multiple strings allow for easier
maintenance on the battery system without jeopardizing service
to the load equipment.
Initial and
supplementary
bays
All subsystems of the ECS battery plant together can occupy one
framework called the INITIAL BAY. Up to six rectifiers,
controller, capacitor charge panel, a breaker or fuse panel and
bus bars will fit in this space. Additional dc output (rectifiers)
and distribution panels (breakers/fuses) can be configured in a
supplementary bay.
If Lucent Technologies VR or IR batteries are used, additional
framework, called battery supplementary bays, is necessary
for strings of VR or IR batteries. These bays are shown in
Figures 1-2 and
1-3. Such supplementary bays are engineered and ordered as part
of the ECS Model J85500D-3 plant or from J85504C-1. See
these drawings for typical arrangements of supplementary bays
with Lucent Technologies VR batteries.
For some installations it may be desirable to order all
supplementary bays for anticipated growth as part of the initial
installation. Installation of supplementary framework during the
initial construction and support of cabling systems will simplify
the future battery plant expansion.