AEG Protect 1. M Operating Instructions Manual page 9

disturbance. Separate battery chargers configured with switch
mode power supply technology are responsible for charging or
trickle-charging the battery connected in the intermediate
circuit. The configuration of these charging rectifiers means the
harmonic content of the charging current for the battery is
almost zero, which increases the service life of the battery
even more. The inverters are responsible for converting the DC
voltage into a sinusoidal output voltage. A microprocessor-
driven control based on a pulse-width modulation (PWM)
integrated in each UPS module guarantees, in conjunction with
digital signal processor technology and extremely fast
pulsating IGBT power semiconductors of the inverters, a
voltage system of the highest quality and availability on the
secured busbar.
In the event of mains faults (e.g. current failures), the voltage
continues to be supplied from the inverters to the load without
any interruption. From this point onwards, the inverters draws
their power from the battery instead of the rectifiers. Since no
switching operations are necessary, there is no interruption in
the supply to the load.
The greatest possible supply reliability of connected loads is
attained by the parallel connection of up to max. six PROTECT
1.040 UPS modules. The n+x technology thus guarantees
maximum reliability through up multiple active redundancy on
the one hand as well as on the other hand the possibility of
increased power with simple redundancy or even only higher
UPS power without any redundancy.
The automatic electronic bypass serves to increase the
reliability of the supply further. It switches the public mains
directly through to the load without any interruption, e.g. when
there is a system overload. As a result, the automatic bypass
represents an extra passive redundancy for the load.
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