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6 - E-51028230XT/BG
System description
(see figure 1)
◗ a rectifier/charger module (A)
converts 3-phase AC power from the
normal AC source supply (1) into DC
power for the normal inverter input and
float charges or recharges the battery;
◗ a battery unit (D) provides backup
power for the inverter in the event of a
voltage drop or a normal AC source
failure;
◗ an inverter module (B) converts the
DC power supplied by the rectifier/
charger module or the battery unit into
3-phase AC power for the load;
◗ a static bypass module (C) ensures
the instantaneous transfer of the load to
the bypass AC source input in the
event of an inverter shutdown (initiated
by the user or by a protective device) or
a sudden overload;
◗ a maintenance bypass isolates the
UPS for maintenance and transfers the
load to bypass AC source input without
interrupting the supply of power. The
maintenance bypass is made up of
three manual switches (Q3BP, Q4S
and Q5N).
Note
◗ the normal AC input and the bypass
AC input have different functions and,
depending on the installation, may be
protected differently upstream and/or
come from different sources.
◗ frequency converters are available
without backup batteries;
◗ the static bypass line and the
maintenance bypass line do not exist in
installations where the load frequency
and the bypass AC source frequency
are different (for example in frequency
converters);
◗ when increased power is required,
several MGE™ Galaxy™ PW units
may be connected in parallel. In this
configuration, an "isolation" function is
added for the UPS system as a whole
for maintenance purposes, without
interrupting the supply of power to the
load.
Introduction (cont.)
The system may also include :
◗ an isolating transformer on bypass
AC input;
◗ a passive harmonic filter (FAH) on
the normal AC input;
◗ an active harmonic conditioner on the
normal AC input;
◗ different remote control, indication
and display systems.
Schematic diagram of the MGE™ Galaxy™ PW system
Fig. 1
maintenance bypass:
Q3BP
inverter (B):
DC to AC
power
isolation:
Q4S
isolation and
protection:
FUS Q5N
rectifier/
charger (A):
AC to DC
power
QF1: isolation
and protection
normal
AC input
load
battery (D):
backup power
static bypass (C):
bypass
AC input
Q1 FUE :
isolation
and protection
(1)
(2)