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11. System Description
An uninterruptible power system (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 short-term
interruptions such as blackouts or brownouts. This power is provided for a sufficient amount of 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.
During normal operation, the UPS uses commercial AC power. It absorbs high voltage spikes and transients
caused by switching and faults, and the common-mode and normal mode noise which is associated with
commercial AC power. The UPS converts it all to clean DC power. From this power, the UPS charges its
batteries and generates its 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 (as long as the backup batteries hold up). When AC input power
becomes available again, operation returns to normal, and the unit's batteries begin to recharge so they will
be ready for the next power interruption.
11.1 Application and Use
In Online Mode the Toshiba T1000 UPS provides continuous computer-grade AC power in a compact, high
performance, and energy efficient unit. The UPS unit ensures safe and reliable operation of critical office
equipment. All units feature an audible alarm which sounds if the battery voltage drops below a specified
minimum during use. This is an additional aid to help protect valuable office data banks. All units allow for
computer interfacing.
11.2 Power Backup
When an electrical power failure occurs, the UPS's internal batteries automatically supply back-up power
to the load without interruption. For example, when used to support a computer, the UPS back-up assures
enough additional time to complete the activity and store the data. This allows an orderly shutdown of
critical equipment.
The T1000 minimum input voltage, ViUV, is 85% of the nominal input voltage of 240V at full load.
11.3 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, everyday problems associated
with unreliable 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.
During brown-out conditions, where the utility power momentarily drops below the minimum 85% of nominal
input voltage, the UPS will transfer to backup mode. Once the input voltage increases above 85% of
nominal input voltage, the UPS will automatically retransfer to Online Mode.
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T1000 Series UPS Installation and Operation Manual – 91074-002
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