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Chapter 2 Installation 29
ACTURA Flex 48330 Power System User Manual
2.5 Parallel Connection Of Cabinets
In order to prolong the backup time of battery, the battery capacity should be
increased. Another cabinet can be connected in parallel with the DC power system
cabinet. The expanded cabinet has no rectifier shelf and Multi-Function Unit. It is
only installed with battery strings and a BCU. So, it is actually the battery cabinet.
BCU in Extension Unit connects to Main Unit through cables. The parallel
connection of the DC power system cabinet with the battery cabinet is shown in
Figure 2-19:
Main cabinet
BCU
Extension cabinet
Batteries
Figure 2-19 Parallel connection of DC power system cabinet with battery cabinet
DC/Parallel connections
The DC cables are connected to the output of the rectifier shelf in the MFU.
Up to two Battery Connection Units (BCUs) can be connected in the DC Power
System – up to one BCU in the main cabinet and up to one BCU in an extension
battery cabinet.
SCU can display the alarm signals from these two BCUs.
The user can connect the MFU to an additional extension MFU (only for additional
load circuit breakers) through suitably rated cables.