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7-1
EATON Powerware
®
9390 UPS (100–160 kVA) Installation and Operation Manual S 164201604 Rev B powerware.com
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 m aintains 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.TheUPS
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.
Output
Contactor
K3
Battery
Battery
Breaker
Battery
Converter
Input
Contactor
K1
AC Input to
Rectifier/
Charger
AC Input to
Bypass
Backfeed
Protection
Contactor
K5
Power Module
InverterRectifier
Digital
Metering
Static
Switch
AC Output
to Critical
Load
UPS Cabinet
Figure 7-1. Main Elements of the UPS System