Specifications

Galaxy 5000 technical specifications
MGE UPS SYSTEMS SPTC5 500 UK – 09/2005 page
8
Load
Rectifier
/charger
Battery
Inverter
Static
bypass
Maintenance
bypass
Normal AC input Bypass AC input
Utility power
(disturbances)
UPS power
(clean)
12 34
UPS
Operating principle
The UPS draws power from the normal AC input
(disturbances are possible). It completely
regenerates the power in the double-conversion
process (rectifier/charger and inverter) to supply the
critical loads with high-quality energy that is
continuously available.
The battery, charged by the normal AC input, can
replace the latter for autonomous operation within
the specified backup time.
The automatic bypass ensures continuous
operation by no-break switching to the bypass AC
input if the inverter stops (voluntary shutdown or
not).
The manual bypass short-circuits the inverter and
the automatic bypass to supply the load during
maintenance.
Different UPS operating modes
1 - Normal (battery charged) or Recharging (battery
recharging)
2 - Operation on battery power
3 - Automatic bypass or ECO (user decision, bypass
AC power must be within tolerances)
4 - Manual bypass
Fig. 2. Galaxy 5000 double-conversion technology.
2.2 PFC rectifier with sixpack IGBT modules
Supply via the normal AC input with a wide voltage range
The Galaxy 5000 rectifier is supplied by the normal AC input with three-phase voltage.
Operation without a neutral is possible.
The input-voltage range is wide (fig. 3), a definite advantage on sites with disturbed distribution systems, due
to the PFC rectifier using sixpack IGBT modules:
 342 to 470 V for operation at full rated load
 250 to 470 V for a 70% load (*), except with the backfeed option.
The permissible frequency range is 45 to 65 Hz.
(*) On almost 90% of sites, the UPS percent load is < 75%.
Normal
AC input
250V 340V
P
/
P
n
470V
Backfeed zone
100%
70%
Fig. 3. Input-voltage range depending on the percent load.
If normal AC power goes outside the above voltage and frequency tolerances, the system switches to
operation on battery power.
Galaxy 5000 UPSs can operate with all system earthing arrangements.
If galvanic isolation is required between the normal AC input and the load (e.g. for a change in system
earthing arrangements between upstream and downstream), an isolation transformer must be used.
This option is available in the cabinets for the standard voltages, 380, 400 and 415 V.
Operating principle
The rectifier converts the AC voltage from the normal AC input into regulated DC voltage to supply the inverter
and charge the battery.
Galaxy 5000 has a fully controlled PFC (Power Factor Correction) rectifier with sixpack IGBT modules that
draw three-phase sinusoidal current. The result is a sinusoidal input current in phase with the AC source
voltage over a wide input-voltage range.