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Centralized Architecture (Continued)
Several additional vintages of centralized architecture systems may also be employed in GPS plants, as
defined on the ED83311 - 30 overhead bus assembly spec. The more common arrangements of this
system provide bus capacities of 5000A or 10,000A run over top of the GPS lineup, in place of the
external battery stand chandelier typically cabled to for centralized architecture, shown schematically
in Fig 4 - 4. Instead, ED83311 - 30 provides bus connections into each rectifier - only and distribution -
only GPS cabinet from the overhead bus run, while the battery strings cable back to this bus run at the
rectifier cabinets and the distribution circuit returns use the bus run over the distribution cabinets,
keeping all circuits closely coupled in a compact, growable system. Each distribution cabinet in these
arrangements is fed through a 6000A load shunt, which is then monitored by its BIC (Bay Interface
Card) shunt circuit, utilizing the optional “All Loads Monitored” function of the system M2 controller for
summing each of these distribution cabinet load shunt readings into a total plant load for the M2.
Refer to Figures 6 - 9 or 6 - 10 and the configuration section that follows them for information on the
wiring and configuration of the distribution cabinet shunt pair required for the proper monitoring of
multiple Load shunts use the ED83311 - 30 overhead bus assemblies.
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