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TS_616_08 PW8000DPA ST (S2) User Manual 21/4/22
37
3: Installation Planning
Battery cables
Internal batteries
The internal batteries in PW8000DPA ST models ST-40 and ST-60 are installed on shelves that form part of the UPS
frame. Each shelf contains a complete battery string which is connected to a UPS module via a battery breaker (F4-
x
).
External batteries
PW8000DPA ST models ST-80, ST-120 and ST-200 do not have provision for internal batteries and therefore require the
batteries to be installed in an external enclosure. A range of external battery enclosures is available from Kohler
Uninterruptible Power Ltd
When planning for an external battery installation please consider the following:
• The external battery must be installed as close as possible to the UPS cabinet.
• We recommend that a separate battery is provided for each UPS module. (See ‘common’ / ‘separate’ battery
configuration details below.)
• If a bespoke battery installation is planned, it must include a 3-pole battery breaker (for each set of battery cables)
installed as close as possible to the battery installation.
• The battery and DC cables must be connected by the commissioning engineer.
• External battery cables and fuses are bespoke to the installation and will be provided by Kohler Uninterruptible
Power Ltd, but it is the customer’s responsibility to design and install any cable containment where necessary.
Note that the external battery string connection requires three cables, one each connected to the battery positive
(+) and negative (–) extremities and a third (N) cable that is connected to the mid-point of the battery string.
Common battery configuration
A ‘common battery’ installation is shown in Figures 3.6 and 3.8.
In this configuration a single external battery, which can itself comprise several parallel battery strings, is connected to the
battery terminals (+, N, –) within the UPS cabinet from where it is connected to the UPS modules via dedicated circuit
breakers (F4-
x
).
Following a mains outage, if there is a total battery failure in a ‘common battery’ system the entire UPS is unable to
operate from battery power, resulting in the loss of the critical load supply. However, the battery normally consists of
several parallel battery strings, and a battery failure in one string only means that the UPS will operate on battery power as
normal but with a much reduced autonomy.
Separate battery configuration
A ‘separate battery’ configuration enhances the overall reliability/availability of the UPS system by providing a degree of
battery redundancy – i.e. following a mains outage, the total failure of a battery only affects it’s associated module and the
remainder of the UPS system can fully support the critical load – assuming n+1 module redundancy.
A ‘separate battery’ installation is shown in Figures 3.7 and 3.9 for a single-feed input and dual-feed input respectively. In
these illustrations each battery is connected directly to the module circuit breakers (F4-
x
) and not to the main battery
busbars (+ve & -ve).
Cabling diagrams
The following diagrams provide recommended cable and fuse rating for the entire PW8000DPA ST range.
Note: The diagrams illustrate the ST-80 (4- module) cabinet, but the attached rating tables cover the complete range.
• The protective earth cable must be sized according to local and national regulations
• Rating are shown for 400V operation with unity load factor. See specification chapter for 380/415V operation.
Key Point: The PW8000 ST-40 and ST-60 cabinets are shipped without the batteries installed.