Eaton 9E10Ki Operations Instructions download pdf (Page 67)

Eaton 9E UPS (20–30 kVA, 208/220V) Installation and Operation Manual 164202124—Rev 5 www.eaton.com/powerquality 5-1

Chapter 5 Understanding UPS Operation

5.1 UPS System Overview

The Eaton 9E 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.

Figure 5-1. Main Elements of the UPS System

The emergency bypass consists of a continuous static switch, and a backfeed protection relay. The backfeed

protection relay is located in series with the static switch. The static switch is armed and ready during normal

operation.

AC Input to

Rectifier/

Charger

AC Output

to Critical

Load

Input

Breaker

Input

Relay

Battery

Relay

Battery

Converter

Battery

Output

Relay

UPS Cabinet

Backfeed

Protection

Relay

Static

Switch

Digital

Metering

InverterRectifier

Power Module

AC Input to

Bypass

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Eaton 9E10Ki Operations Instructions Page 67

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