Kohler PowerWAVE 8000DPA RI (S2) Series, Руководство пользователя, Страница: 13 / 88

TS_616_08 PW8000DPA ST (S2) User Manual 21/4/22
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2: General Description
Flexible battery management
This equipment employs flexible battery charging management which avoids premature deterioration of battery life and
provides preventive failure diagnostics.
The major benefits are:
• AC-ripple free battery charging due to a dc-dc charger separated from the rectifier and inverter.
• Wide range of number of battery blocks (30-50 blocks of 12V; depending autonomy times).
• Wide UPS input voltage operating window extends the battery life due to fewer discharge cycles.
• Battery discharge protection caused by load jumps.
• Proactive battery protection from false manipulations and inadequate charging voltages.
• Proactive battery failure detection thanks to Advanced Battery Diagnosis (ABD) algorithm.
• User selectable battery tests.
• Optional temperature compensated charging to enhance battery life.
2.2.3 System expansion using parallel cabinets
Some UPS applications present a low initial power requirement which increases over time as the application grows; and it
is therefore essential that the installed UPS system can be expanded to meet the growing demand without compromising
the existing load. This requirement is well met with the ‘hot swappable’ nature of the PowerWAVE 8000DPA ST (S2) UPS
power modules just described, which allows additional module(s) to be inserted into a vacant slot in an existing cabinet
when needed; however, it is also possible to further increase the UPS system capacity by connecting the outputs of
several UPS cabinets in parallel.
When two or more UPS cabinets are connected together all the UPS modules within the cabinets are effectively paralleled
– for example a UPS system comprising three fully populated ST-120 cabinets will contain 18 fully paralleled UPS
modules offering a system capacity of 360 kW.
Note: If a system expansion requires an additional cabinet to be installed, the system will have to be shut down while the
cabinet is being electrically connected.
The maximum number of PW8000DPA ST cabinets that can be paralleled is shown in the table below.
Parallel control in a multi-cabinet UPS system
A parallel cabinet system requires the same degree of inter-module control concerning synchronisation, load sharing,
bypass switching etc. as described for the modules operating in an individual cabinet. In order to achieve this a parallel
communication bus, carrying all the necessary parallel control signals, is connected between the cabinets as shown in
Figure 2.7. The parallel control mechanism still relies on a ‘master’/ ‘slave’ relationship between the modules fitted in the
various cabinets and it is usual for UPS module 1, fitted in cabinet 1, to be set as the ‘master’ module.
Note: For reasons described later, the cabinet containing UPS module 1 is designated as being the ‘master cabinet’
Key Point: When planning a multi-cabinet system, it is not necessary to fully populate one cabinet with UPS
modules before installing the next cabinet. For example, if it is known at the outset that the eventual load is likely
to reach 300 KW it makes good design sense to install and cable-up four ST-80 cabinets and equally distribute
the number of initially required modules between them.
ST-40 ST-60 ST-80 ST-120 ST-200
Number of UPS power modules per cabinet 2 3 4 6 10
Parallel cabinets per system 4 4 4 3 2
Max number of UPS power modules per system 8 12 16 18 20
Max system capacity (without redundancy) 160 240 320 360 400