Product Description; Theory Of Operation; Application And Use; Power Backup - Toshiba 4200 series Operation Manual

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 load equipment. 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 main 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 with no 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 AC input power becomes available again, operation returns to normal. The UPS
batteries begin to recharge, so they will be ready for the next power interruption.
1.2

Application and use

Toshiba's 4200 Series of on-line, Uninterruptible power systems (UPS) provide continuous
computer grade 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 standard during use. This is an additional aid to help in retaining
the valuable office data banks, and all units allow for computer interfacing.
1.3

Power Backup

During an electrical power failure the UPS unit's 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 and
store data 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. This protection keeps power-line problems
from reaching your load, where it can cause equipment to operate erratically, or damage
software and hardware.
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