Understanding Ups Operation; Ups System Overview; Figure 6-1. Main Elements Of The Ups System - Eaton Power Xpert 9395 Installation And Operation Manual

Chapter 6

Understanding UPS Operation

6.1

UPS System Overview

The Eaton Power Xpert 9395P-300 UPS is a continuous-duty, solid-state, transformerless (at 480 Vac),
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 6-1 shows the main elements
of the UPS system.
If utility power is interrupted or falls outside the parameters specified in Chapter 10, "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 system allows you to either transfer to an
alternative power system (such as a generator) or shut down your critical load in an orderly manner.
AC Input to
Rectifier/
Charger
AC Input to
Bypass
NOTE On a UPS configured as an Input Output Module (IOM), the bypass input, static switch, and backfeed protection
contactor (K5) are not present.

Figure 6-1. Main Elements of the UPS System

® ®
Eaton Power Xpert
Battery System
Input
Breaker
Input
CB1
Contactor
(optional)
K1
9395P-300 (300kVA, 300kW) UPS Installation and Operation Manual
Battery
Battery
Breaker
Battery
Contactor
K2
Battery
Converter
Rectifier Inverter
Power Module
Digital
Metering
Backfeed
Protection
Contactor
Static
Switch
UPS Cabinet
P-164000563—Rev 04 www.eaton.com/powerquality
Output
Contactor
K3
K5 AC Output
to Critical
Load
6-1