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Installation and User Manual
1.3 System Major Power Components
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.
Battery unit (D) Provides backup power for the inverter in the event of a voltage drop or a normal AC
source failure.
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.
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.
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).
External Bypass Option for parallel UPSs and Hot-Swapping.
Q5N: Isolation of the inverters of all the parallel UPS systems from the load.
Q3BP: Bypass for maintenance.
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.
When increased power is required, several Galaxy PW™ units may be connected in parallel (up to four, refer to
section 4.0). 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 1 — 386-133060-00 A00