Introduction
1-2
Eaton BladeUPS 12 kVA Maintenance Bypass Cabinet Installation and Operation Manual P-164000130—Rev 1
www.eaton.com/powerquality
1.1
Maintenance Bypass Cabinet Features
The MBC has many standard features that provide cost-effective and consistently reliable power protection.
1.1.1
Full System Bypass
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While the BladeUPS modules have an internal bypass, the MBC provides full system bypass to allow for
testing and maintenance.
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With the MBC, service, testing, and maintenance can be performed on up to a full rack of BladeUPS
modules without interrupting power to the critical load.
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The Maintenance Bypass Breaker (MBB) and UPS Output Breaker (UOB) enable power to the critical load
and completely bypass the BladeUPS. The BladeUPS can then be serviced or replaced safely, without
interrupting power to critical systems.
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The Rectifier Input Breaker (RIB) provides a single wiring point input to the BladeUPS, and a convenient
method for removing power from the UPS when using the maintenance bypass to supply the load.
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The System Input Breaker (SIB) is the main system breaker. Opening the breaker removes power from the
transformer and isolates the MBC from the 480V input power source.
1.1.2
Power Distribution
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Power is distributed for up to a full rack of BladeUPS modules serving IT equipment.
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Power distribution is provided to servers or racks through a variety of optional distribution choices and a
number of different output configurations. For example, the standard configuration option includes two
225A 42-pole panel boards with up to 42 single pole circuit breakers, providing 84 pole positions with the
proper kVA rating. See the Appendix drawings A-3 through A-15 for the various output configurations.
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The MBC also provides streamlined top or bottom power cabling through cabling access landing plates.
1.1.3
Transformation
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Voltage transformation allows the MBC to change available site utility voltage to a level that is acceptable for
the BladeUPS system.
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The 480 Vac, 3-wire utility input is stepped down through an isolation transformer to 208/120 Vac to provide
the appropriate 208V, 4-wire (3P + N) for the BladeUPS modules.
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The transformer also provides electrical isolation for the BladeUPS system and the connected loads.
1.1.4
Safety Features
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There is a mechanical interlock bar between the MBB and UOB to prevent them from being opened at the
same time, thereby dropping the load accidently.
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A UPS bypass indicator light on the MBC signals that the BladeUPS system’s bypass mode is activated or
deactivated.
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The front door panels provide interior safety shields to serve industrial or computer room deployments.
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Control signal input wiring between the MBC and the BladeUPS allows the MBC to initiate a forced bypass
of the UPS under specific conditions as a safety precaution.
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A contact is provided for an optional customer-provided remote emergency power-off (REPO) pushbutton
that can be installed to provide shunt tripping. Once wired to the MBC and UPS, the MBB, UOB, RIB, and
SIB breakers on the MBC can be shunt-tripped all at the same time.
Summary of Contents for BladeUPS none
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