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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
RECTIFIER/
CHARGER
INPUT
ISOLATION
TRANSFORMER
INPUT
FILTER
UPS CABINET
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
DC INPUT
DC/DC
CONVERTER
POWER PROCESSING UNIT
RECTIFIER/
CHARGER
DIGITAL
METERING
STATIC
SWITCH
CONTACTOR
Figure 17. Main Elements of the UPS System
Powerware BPIII Harsh Environment UPS 50--75 kV Installation and Operation
AC OUTPUT
TO CRITICAL
OUTPUT
TRANSFORMER
OUTPUT
CONTACTOR
INVERTER
BYPASS
AC INPUT
TO BYPASS
LOAD
MAINTENANCE
ISOLATION
SWITCH
(MIS)
MAINTENANCE
BYPASS
BREAKER
(MBP)
BYPASS
INPUT
BREAKER
(BIB)
164291261 Rev. F 111503
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