Powerware 5075 kVA operation manual Looking Inside the UPS, Power Processing Unit

Looking Inside the UPS

The Powerware BPIII HE is a continuous duty, solid-state UPS that supports the following equipment: process control, data processing, and telecommunications/PBX. The Powerware BPIII HE maintains power to the critical loads during commercial electrical power brownout, blackout, overvoltage, undervoltage, and out-of-tolerance frequency conditions.

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 17 shows the main elements of the UPS.

AC INPUT TO	DC INPUT	AC OUTPUT	AC INPUT
RECTIFIER/		TO CRITICAL	TO BYPASS
CHARGER		LOAD
	DC/DC
	CONVERTER

INPUT	POWER	PROCESSING	UNIT
ISOLATION
			OUTPUT
TRANSFORMER
			TRANSFORMER MAINTENANCE
			ISOLATION
			SWITCH
			(MIS)
			OUTPUT
	RECTIFIER/		CONTACTOR
		INVERTER
	CHARGER
			MAINTENANCE
			BYPASS
		DIGITAL	BREAKER
			(MBP)
		METERING

INPUT

FILTER

STATIC

SWITCH

BYPASS

INPUT

BREAKER (BIB)

BYPASS

CONTACTOR

UPS CABINET

Figure 17. Main Elements of the UPS System

If utility power is interrupted or falls outside the parameters specified in the Product Specifications section of Chapter 16, the UPS uses a backup supply to sustain power to the critical load for a specified period of time or until the utility power returns. For extended power outages, the backup supply 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 operation of the UPS system is described in greater detail in the following paragraphs. The Product Specifications section of Chapter 16 outlines the storage and operating specifications for the UPS.

40 Powerware BPIII Harsh Environment UPS 50--75 kV Installation and Operation

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