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Parallel Online UPS Online UPS technology or installations that provide redundant sources of conditioned backup power so that the critical load is protected even in the event of UPS component failure.

Power Factor (PF) The ratio of total real power, (W) to the total apparent power in volt-amperes (VA);W/VA.

Power Management Software Provides monitoring and shutdown for UPS and connected load.

Power System A rack module, single rack or several parallel connected racks, providing DC power to a single DC bus.

Preset Voltage The voltage that a rectifier will default to if communications with the Supervisory Module is lost. Generally, this is set to the float voltage by the Supervisory Module.

PSTN Public Switched Telephone Network