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102 Safety Warnings
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Read and obey CAUTION statements regarding electrical wiring, battery modules, and external battery
cabinets. See Sections 300 and 1400.
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The user is required to provide power input (mains) and output disconnect devices for the UPS. These must
be within sight of the UPS, and easily accessible. For a mains plug-in power cord input, the plug serves as
the power input disconnect device, which must also be readily accessible.
200 UPS Description
The Axxium Pro UPS is a modular uninterruptible power system that contains battery modules and power
control (referred to as “power”) modules. These modules plug into a rack structure containing additional
communication, control, and display functions that enable integrated control of all power modules. The UPS is
housed in a single cabinet, with extra battery capacity housed in adjacent battery cabinets.
The pluggable power modules can be removed and replaced (hot swapped) without powering the UPS down if
the UPS has sufficient redundant capacity. Battery modules may also be hot swapped for maintenance. Power
control circuitry in the cabinet senses problems in power modules, and automatically transfers control to
redundant modules.
All power modules share the load requirements equally. For example, three power modules are capable of
supplying a total of 9 kVA. If a load requires only 4.5 kVA, each power module supplies 1.5 kVA to the output.
If one power module is removed or for some reason fails, each of the two remaining power modules would
supply half of the load, or 2.25 kVA. (In other words, redundancy exists when the load can be supplied by less
than all of the installed power modules.)
The UPS can be programmed for any level of redundancy; its output is limited such that an excess number of
power modules allow the failure of one or more modules without causing the UPS to lose any functionality.
An external bypass switch is required to be installed to remove the UPS completely from a power path. This
switch is optional but recommended for system servicability.
This section provides a brief overview of the cabinets and modules, and describes how the UPS operates as it
switches between various operating modes. These descriptions will help you understand how to turn the system
on and off, and when to switch it into various manual modes. The descriptions will also help in interpreting
displayed parameters and alarm messages.
