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

Chapter 6
Figure
6.1

UPS System Overview

Battery Cabinet or
Battery String
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.
t
Power Xpert

Understanding UPS Operation

The Power Xpert 9395 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.
Battery
Breaker
Battery
Contactor
Input
Contactor
K1
Rectifier
Figure 6‐1. 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 allows you to either transfer to an alternative
power system (such as a generator) or shut down your critical load in an orderly
manner.
9395 UPS (450–550 kVA) Installation and Operation Manual
Battery
K2
Battery
Converter
Inverter
Power Module
Digital
Metering
Static
Switch
Backfeed
Protection
Contactor
K5
UPS Cabinet
S
164201701 Rev 3 www.eaton.com/powerquality
Output
Contactor
K3
AC Output
to Critical
Load
6-1