System Overview

Each Galaxy VX UPS consists of the following components:

An I/O cabinet for wield wiring containing the static switch, a backfeed breaker BF2*, and the user interface.
A number of 250 kW power cabinets containing the power electronics.

UPSs with 1250 kW I/O Cabinet

The 1250 kW I/O cabinet is used for UPS systems from a minimum configuration of 500 kW with two power cabinets to a maximum configuration of 1250 kW N+1 with six power cabinets. The I/O cabinet is placed to the left and two to six power cabinets (depending on system size) are placed to the right. The image below shows the maximum configuration.

UPSs with 1500 kW I/O Cabinet

The 1500 kW I/O cabinet is used for UPS systems from a minimum configuration of 500 kW with two power cabinets to a maximum configuration of 1500 kW N+1 with seven power cabinets. The image below shows the maximum configuration.

Maintenance Bypass Cabinet for UPSs with a Maximum Rating of 750 kW

The maintenance bypass cabinet contains the following breakers to isolate the UPS during maintenance:

Static switch input breaker (SSIB)
Maintenance bypass breaker (MBB)
Unit output breaker (UOB)