Eaton BladeUPS 12 kVA Maintenance Bypass Cabinet Installation and Operation Manual P-164000130—Rev 1
www.eaton.com/powerquality
4-1
Chapter 4
Operation Modes
4.1
Understanding UPS Mode
The BladeUPS supplies conditioned and protected power to the critical load. The BladeUPS is a 208V UPS, but
the data center power source may be 480V. An isolation transformer in the Maintenance Bypass Cabinet (MBC)
converts the 480V input power to 208V and routes the power to the BladeUPS to be used in conjunction with
data center equipment.
While in UPS mode, the Maintenance Bypass Breaker (MBB) is open and both the Rectifier Input Breaker (RIB)
and the UPS Output Breaker (UOB) are closed. If the configuration includes power distribution panelboards, the
BladeUPS provides power to the critical loads through the MBC UPS Output Breaker (UOB) to the power
distribution panelboards. The branch breakers providing power to the critical load are also closed.
Figure 4-1 shows the path of electrical power through an example MBC when operating in UPS mode.
CRITICAL LOAD
PANEL BOARD B
FROM UPS
OUTPUT
SYSTEM
INPUT
PANEL BOARD A
CRITICAL LOAD
TO UPS
RECTIFIER INPUT
UOB
MBB
RIB
480V
SIB
208V
MAIN POWER FLOW IN UPS MODE
MAIN POWER FLOW IN MAINTENANCE BYPASS MODE
Figure 4-1. Path of Current in UPS Mode Example
Summary of Contents for BladeUPS none
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