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Major Components
Rectier Converts AC input voltage to DC voltage. The rectier uses IGBT (Insulated
Gate Bipolar Transistor) power transistors and a Pulse Width Modulated (PWM)
technique to provide input power factor correction and to minimize any harmonic
reected onto the input power lines.
Inverter
Converts DC voltage from the rectier or from the batteries into AC output voltage
to maintain the attached load. This module uses the IGBT technology to provide
digital power quality.
Static Switch Automatically supplies the attached load from the bypass source when the inverter
is off.
Battery System
Stores energy for utilization by the inverter and attached load in the event that utility
AC power is lost or is of unacceptable quality.
Single Line Diagram
During normal operation, the utility power (Main input) is supplied to the UPS rectier. The rectier
converts the AC power to DC that is supplied to the inverter. The inverter converts the DC voltage to
three-phase regulated AC voltage, which is supplied to the attached load.
During power failure conditions, the inverter is supplied by the stored energy in the battery system, and
the load is powered continuously with no interruption.
The MGE Galaxy 4000 UPS is designed for internal operation of 208VAC input and output. External
batteries, and an output distribution panel may be contained in auxiliary cabinets similar in design to
the MGE Galaxy 4000 cabinet. Batteries or external maintenance bypass circuit breakers may also be
contained in third party cabinets or wall mounted units.
Refer to Appendix “Single Line Diagram”.
Standard Cabinets
The MGE Galaxy 4000 individual cabinet dimensions are:
• UPS cabinet: 72.1in (1831mm) H x 33.5in (851mm) W x 35.6in (904mm) D.
• External battery cabinet: 72.1in (1831mm) H x 26.5in (673mm) W x 33.5in (851mm) D OR –
• External battery cabinet: 72.1in (1831mm) H x 33.5in (851mm) W x 33.5in (851mm) D.
• Distribution cabinet: 72.1in (1831mm) H x 19.5in (495mm) W x 33.5in (851mm) D.
The UPS cabinet is designed to provide for top and bottom entry of the utility power feed. An output
voltage of 208VAC is standard with the MGE Galaxy 4000 and does not require any additional
cabinetry. The complete list of additional cabinets that could be included with your MGE Galaxy 4000
system are: external maintenance bypass wall cabinet, external battery cabinet, and distribution cabinet.
The external battery cabinets are provided in two different cabinet sizes depending upon the battery type
selected. Up to four battery cabinets may be provided. The cabinets may be installed adjacent to the
UPS or remotely and are designed for top and bottom entry. The distribution cabinet provides a 42 pole
panelboard, with an optional submain circuit breaker. The cabinet is designed for top and bottom entry.
990–3964–001
MGE Galaxy 4000 40–75 kVA 208 V
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