Overview - ETA Systems 350VA Guide De L'utilisateur

ETA SYSTEMS - UNINTERRUPTIBLE POWER MANAGER
5.0 – OVERVIEW
General
The ETA SYSTEMS series of Uninterruptible Power Managers are the most advanced, line-interactive, true
sinewave UPM products available for your application. Each model is designed to provide total protection
for your system from a complete range of power quality problems. ETA UPM solutions will protect your
installation from normal mode voltage impulses, electrical noise, sags and surges, protracted brownouts,
and complete blackouts. And because each UPM contains an isolation transformer, it completely eliminates
common mode (neutral to ground) voltages that are a constant threat to the reliable operation of
microprocessor based systems. When AC power is present, the UPM constantly filters and conditions the
power supply. When AC power fails, the UPM uses its internal, maintenance-free battery to supply reserve
power to your computer system. Regardless of whether or not commercial power is present, the UPM is
constantly on the job, ensuring a fully conditioned, safely managed interface between your computer system
and its electrical power supply. Figure 1 illustrates the basic operation of the UPM.
Sinewave Output
The output voltage of all ETA UPM models is a true, low distortion sinewave – the kind that the utility
company provides to the wall outlet and the kind that your equipment is designed to work with. This
provides guaranteed compatibility even with the most sensitive electronic loads.
Voltage Manager™
The voltage of the AC power source can often fluctuate from its nominal rating. These deviations in line
voltage are tolerated quite well by most switch mode power supplies (the type used in many modern
electronic systems). However, some UPS products may misinterpret these transient changes in line voltage
as a power outage and erroneous battery operation may occur. This type of activity results in unnecessary
strain on the battery and may eventually shorten its life. ETA SYSTEMS's UPM products feature Voltage
Manager – a circuit that constantly monitors the AC power source. If minor changes in AC voltage occur,
Voltage Manager adjusts the input voltage to the UPM circuitry so that erroneous inverter operations are
avoided. Ensuring that the UPM switches to its batteries only in the event of a true power outage results in
longer battery life and a lower cost for both maintenance and ownership.
Start Manager™
Start Manager is special circuitry that allows you to start the UPM from either the main AC supply or from its
own internal battery. On occasion, AC power may not be available – such as when installing a system in a
location where the electrical wiring has not been completed. Start Manager allows you to start the UPM and
its connected system to perform final tests on both the UPM and the computer systems it's powering.
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