Powerware 100160 kVA manual Understanding UPS Operation, Looking Inside the UPS System

Chapter 7

Understanding UPS Operation

7.1 Looking Inside the UPS System

The Powerware 9390 UPS is a continuous-duty, solid-state, transformerless (at 208 and

480 Vac), three-phase, true online system that provides conditioned and uninterruptible AC power to the UPS system’s output. The UPS supports process control, data processing, telecommunications/PBX, research, and non-patient medical equipment. The Powerware 9390 UPS maintains power to the critical loads during commercial electrical power brownout, blackout, overvoltage, undervoltage, and out-of-tolerance frequency conditions.

The basic system consists of a rectifier, battery converter, inverter, monitoring/operation control panel, integrated communication server, and digital signal processor (DSP) logic.

In this manual, the power required by your equipment is called the critical load. The UPS supplies the critical load with conditioned power that is synchronized with your utility power. Figure 7-1 shows the main elements of the UPS system.

Battery Breaker

Battery

Battery

Converter

AC Input to Rectifier/ Charger

Input

Contactor

K1

Rectifier

Output

Contactor

K3

Inverter

Power Module

AC Input to Bypass

Backfeed

Protection

Contactor

K5

Digital

Metering

Static

Switch

UPS Cabinet

AC Output to Critical Load

Figure 7-1. Main Elements of the UPS System

EATON Powerware® 9390 UPS (100–160 kVA) Installation and Operation Manual S 164201604 Rev B powerware.com 7-1