Lucent Technologies Lineage
®
2000 ECS Battery Plant H569-416
3 - 16 Engineering, Planning & Ordering
Issue 2 August 1996
different vendors of the same capacity battery. Floor loading
restrictions may limit stacking of batteries. Structural limitations
of the building must be clearly understood before selecting a
battery arrangement.
See paragraph “Floor Plan Data” for more information on floor
loading. Applications with space restrictions such as standard
aisle depths may dictate the use of more strings of smaller
batteries.
Anticipated Growth: The growth pattern for the battery plant
may dictate the battery size. It is usually easier to engineer and
install additional strings of the same battery type and capacity as
those already in place. The growth in battery capacity is directly
related to the growth in rectifier capacity, since both must
increase with increasing load current. Since only a fraction of
added rectifier capacity is needed for recharging added batteries,
the matching incremental change in battery capacity depends on
the desired recharge factor. (See paragraph “Charge Capacity
and Recharge Time” for an explanation of charge capacity and
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, it is a good practice to select battery size such that at
least two strings are required for applications where service
reliability is critical. 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, excluding batteries, can
occupy the entire framework called the INITIAL BAY. The
ultimate capacity of the battery plant (12 rectifiers and 63 circuit
breakers) will fit in this space. For batteryless plants, the initial
bay is the only necessary assembly.