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T e c h n i c a l I n f o r m a t i o n
Uninterruptible Power Supply
The Uninterruptible Power Supply is a self-contained battery-backed unit
which supplies the system unit with all its power requirements. The
following is a list of its major features:
♦
1000W maximum total DC output
♦
Auto-ranging AC input voltage selection
♦
48V DC input from backup batteries
♦
Battery power circuit breaker
♦
Constant voltage battery charging output
♦
Remote control/monitoring facility
♦
Cooling fans mounted on, and powered from, the power supply
♦
Compliance with all relevant safety standards
Four 12V batteries mounted inside the power supply unit in a removable
pack provide backup power in the event of a mains electricity supply
failure. These batteries allow the system to function normally during a
short power failure. During a longer failure, the batteries allow the system
to be shut down in an orderly fashion, thereby preventing any data loss.
Whenever the AC supply is available, the power supply charges the
batteries unless the battery isolation switch (i.e. circuit breaker) is in the
OFF position.
The power supply is controlled from the Front Panel. It normally operates
in one of two modes, Power On or Standby. In Power On mode, unit
provides electricity to all its outputs and the system functions normally. In
Standby mode, the power supply unit is shut down, but it continues to
keep the batteries fully charged, and some of the control signals are still
valid.
A temperature sensor with normally closed contacts is fitted in the power
supply. This forms part of the over-temperature protection circuit and an
alarm will sound if the contacts open.
During operation from the batteries, the power supply shuts down when
the battery terminal voltage reaches 42V. This avoids battery damage.
The power supply voltage selection is auto-ranging. This means that there
is no selector switch on the unit. It will detect the proper voltage and
function normally with no effort on your part. The ideal voltage ranges
for the power supply unit are:
♦
85-132V
♦
180-264V
5-50 OWNER'S HANDBOOK
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