2: Description
2-2 UPS413-01-00 Kohler PW 6000 (60-500kVA) User Manual 25 June 2012
2.2 Kohler PW 6000 Model range
The Kohler PW 6000 UPS range includes 60, 80, 100, 120, 160, 200, 250, 300, 400 and 500kVA models.
Models in the 60-100kVA range are available in three cabinet sizes, two of which incorporate internal battery
housings. Modules greater than 100kVA require the UPS batteries to be mounted in a separate battery
enclosure or mounted on a purpose-designed battery rack. A range of optional battery closures are available.
For a complete description of the various cabinets’ weight and dimensions see Chapter 8 (Specifications).
2.2.1 Single/Parallel system configurations
The Kohler PW 6000 UPS can be configured to operate as a single, stand-alone UPS or several (up to 10)
UPS cabinets can be connected in parallel to operate as a multi-module UPS system. A multi-module
configuration is generally chosen either to increase a system’s total power capacity or to increase the
system’s overall reliability by providing a degree of
module redundancy.
Note: In this manual the terms ‘multi-module system’ and ‘parallel system’ are synonymous.
Parallel system operation
When operating as part of a parallel UPS system it is critical that various control functions such as load
sharing, frequency synchronisation and load transfer are observed by all the connected UPS modules. In the
Kohler PW 6000 UPS system this is achieved by a parallel control bus which allows all the connected
modules to communicate with each other and carry out the necessary synchronous control operations.
Due to its Decentralised Parallel Architecture (DPA) design each Kohler PW 6000 UPS can take the
leadership role when operating in a multi-module system. This avoids single points of failure in the parallel
chain once again ensure the highest level of power availability.
Parallel system expansion
Most data centres present a low initial power demand which increases as the data centre grows to its full
capacity; and it is essential that the installed power protection system can be expanded to meet the growing
demand without compromising the existing load. This situation is easily managed in a Kohler PW 6000 multi-
module installation which allows an additional module to be connected to an existing parallel system without
having to temporarily transfer the load to the raw mains (by-pass) supply. Thus the load still receives UPS
protected power at all times during the upgrade process – without interruption.
2.3 Kohler PW 6000 functional description
Figure 2.1 Kohler PW 6000 UPS block diagram
Key Point: All the UPS modules connected to a parallel system must be of the same power rating.
