Lucent Technologies -48V CPS4000/CPS4000 PLUS Cabinet Power System
3 - 4 Engineering and Ordering Issue 13 December 2000
Engineering Information, continued
Battery Sizing
Considerations
Batteries having different output current capacities should not be mixed
in the same battery plant.
Figure 3-1 illustrates several general guidelines for choosing the
recharge factor.
• A minimum recharge factor of approximately 1.2 is required to
recharge the battery effectively.
• As the reserve time increases, the recharge factor required to
maintain a given recharge time must also increase.
• Continuing to increase the recharge factor above approximately 1.4
does not significantly reduce the recharge time.
Rectifier/Converter
Sizing
ES660 and ES660C rectifiers having different output current capacities
can be mixed in the same battery plant.
In most configurations two rectifiers are required to start one converter,
which is providing constant-power loads typical of telecommunications
applications. Two rectifiers are required for continued operation of one
converter. A third rectifier becomes the redundant rectifier in an N+1
rectifier plant. For plant configurations with redundant rectifiers and
redundant converters, the number of installed converters is twice the
number of installed rectifiers.
For applications requiring four fully loaded converters in batteryless
plants, two additional rectifiers may be required to start the system. For
applications requiring an external load on the primary bus, an additional
rectifier must be added to supply this load and continue to maintain an
N+1 system configuration.
Note
These notes describe plants using fully loaded converters.
Using partially loaded converters may divide the primary bus
load between the converter inputs and primary bus output.
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