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Which UPS is right for the job?

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Executive Summary

Traditionally, data center managers and facilities managers could choose from three UPS topologies: standby, line-interactive and double-conversion?offering widely varying levels of efficiency, performance and protection.

The latest generation of double-conversion UPSs offers unique multi-mode capabilities. The UPS operates in a very high-efficiency mode unless power conditions warrant a switch to the higher protective level typical of double-conversion mode.

This white paper describes how various UPS topologies work and looks at the impact of operating mode on five key factors of UPS performance: ? Maintaining voltage within tolerances ? Transferring among modes without locking up IT equipment ? Transitioning gracefully to and from generator power ? Reliability and availability ? Energy efficiency

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