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TOSHIBA
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1.0 Product Description
1.1 Theory of Operation
An Uninterruptible Power Supply (UPS) is a system that is installed between the commercial
power and the critical load. The UPS provides steady AC output power during commercial
power fluctuations and interruptions.
During “Normal Operation” the UPS utilizes commercial AC power and removes high voltage
spikes and transients caused by switching and faults on the utility. The result of this process
is maximum power conditioning and regulation.
If the AC power supplied to the UPS drops below a specified voltage level, the unit's batteries
automatically begin supplying power instead of receiving it. This insures that the loads
connected to the UPS continue to receive power without interruption. This power is provided
for a long enough time so that the load can be shut down in an orderly fashion. This prevents
loss of data and possible damage to both hardware and software.
When the AC input power becomes available again, the operation returns to normal and the
batteries begin to recharge for the next power interruption.
1.2 Application and Use
Toshiba's 4200FA On-Line, Uninterruptible Power Systems (UPS) provide continuous
computer grade isolated AC power in a compact, efficient, high performance unit. The UPS
assures safe, reliable operation of critical office equipment, ranging from personal computers
to mini-computers to local area networks (LAN). All units feature an audible alarm that sounds
if the battery voltage drops below the standard during use. This is an additional aid to help in
retaining valuable data and equipment. All units are capable of interfacing to a computer
network.
1.3 Power Backup
During an electrical power failure the UPS batteries automatically supply DC power to the
inverter that supports the load equipment, without interruption. For example, when used to
support a computer, the UPS’s back up assures additional time to complete your activity, store
data and initiate an orderly shutdown after a power failure occurs.
1.4 Power Conditioning
While commercial power is present, the UPS supplies conditioned power to the load while
maintaining its batteries in a charged condition. The UPS protects the connected load against
the normal, everyday problems associated with heavy use of raw commercial power, including
power sags, surges, signal interference, and spikes. In addition, the models with transformers
provide total isolation to reduce the common and normal mode noises. This adds further
protection to keep power-line problems from reaching your load, where it can cause equipment
to operate erratically, or damage hardware and software.