Eaton 93PM UPS User Manual

Eaton 93PM UPS (20–50 kW, 480V Four Wire – 50 kW Frame) Installation and Operation Manual P-164000540—Rev 4 www.eaton.com/powerquality 5-1
Chapter 5 Understanding UPS Operation
5.1 UPS System Overview
The Eaton 93PM UPS is a continuous-duty, solid-state, transformerless, three-phase, true online system that
provides conditioned and uninterruptible AC power to the UPS system's output and critical load.
The basic system consists of a rectifier, battery converter, inverter, monitoring/operation control panel,
integrated communication server, and digital signal processor (DSP) logic. Figure 5-1 shows the main elements
of the UPS system.
If utility power is interrupted or falls outside the parameters specified in Chapter 9, “Product Specifications,”
the UPS uses a backup battery supply to maintain power to the critical load for a specified period of time or
until the utility power returns. For extended power outages, the UPS allows you to either transfer to an
alternative power system (such as a generator) or shut down your critical load in an orderly manner.
The emergency bypass consists of a continuous static switch, and bypass switchgear. The bypass switchgear
is located in series with the static switch. The static switch is armed and ready during normal operation.
This unit is a four-wire device. The loss of a single input phase or the loss of neutral with unbalanced four-wire
loads will be considered a complete loss of input power and discharge the battery to provide power to the load.
Figure 5-1. Main Elements of the UPS System
AC Input to
Rectifier/
Charger
AC Output
to Critical
Load
Rectifier
Switchgear
Battery
Switchgear
Battery
Converter
Battery
Inverter
Switchgear
UPS Cabinet
Bypass
Switchgear
Static
Switch
Digital
Metering
InverterRectifier
Power Module
AC Input to
Bypass

Eaton 93PM UPS Specifications

General

Brand	Eaton
Model	93PM UPS
Category	UPS
Language	English