TOSHIBA
1.0
Product Description
1.1
Theory of Operation
An uninterruptible power supply is a system that is installed between the commercial
power and the load equipment. It is used during short-term blackouts or brownouts. The
UPS provides steady ac output power during these commercial power interruptions.
This power is provided for a sufficient amount of time to allow the load to be shutdown in
an orderly fashion. This prevents loss of data and possible damage to both hardware and
software.
During normal operation the UPS uses commercial ac power. In addition, it suppresses
high voltage spikes and transients caused by switching and faults. It also filters common
and normal mode noise which is associated with commercial ac power. The UPS
converts this noise to flat dc power. From this dc power, the UPS charges the batteries
and generates it's own extremely high quality ac waveform output. 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. When ac
input power becomes available again, operation returns to normal. The unit's batteries
begin to recharge so they will be ready for the next power interruption.
1.2
Application and Use
Toshiba's 1400XL Plus Series of on-line uninterruptible power supply (UPS) systems
provide continuous computer-grade ac power in a compact, high performance, and
energy efficient unit. The UPS unit assures safe and reliable operation of critical office
equipment. This can range from word processors and personal computers to mini-
computers and local area networks. All units feature an audible alarm which sounds if the
battery voltage drops below an allowable level during use. This is an additional aid to help
in retaining valuable office data banks. All units allow for computer interfacing.
1.3
Power Backup
When an electrical power failure occurs, the UPS unit's internal maintenance-free
batteries automatically supply backup power to the load without interruption. For
example, when used to support a computer, the UPS backup assures enough additional
time to complete the activity and store data. This allows an orderly shutdown after a
power failure has occurred. Toshibas 1400XL Plus Series offers UPS models with the
following capacities and voltages: When input and output voltage are both 240 volts, UPS
models UC3G2L024C6(P#), UC3G2L036C6(P#), UC3G2L060C6(P#), and
UC3G2L080C6(P#) will supply the maximum rated power to the loads (output capacity:
2.4/3.6/6/8 kVA). If input or output voltage for these models is 208 volts, UPS output
capacity will be reduced to 87% of maximum rated power capacity. Units with input
voltage ratings greater than 208V will supply full kVA to the load.
1.4
Power conditioning
When commercial power is present, the UPS supplies conditioned power to the load
while maintaining its batteries in a charged condition. The UPS protects against the
normal, every day 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 they can cause equipment to
operate erratically, or damage software and hardware.
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