Eaton 93E MK2 - Understanding Ups Operation; UPS System Overview; Figure 5-1. Main Elements of the UPS System

Chapter 5 Understanding UPS Operation
5.1 UPS System Overview
The Eaton 93E MK2 UPS is a continuous-duty, solid-state, 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
sy stem.
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 po w er
system (such as a generator) or shut down your critical load in an orderly manner .
External Battery cabinet
Battery
Relay
Battery
Converter
AC Input to
Rectifier/
Charger
Input
Switch
Input
Relay
Output
Relay
Rectifier Inverter
Power Module
Digital Metering
AC Input to
Bypass
(Optional Dual Input)
Bypass Input Switch
(Optional)
Static
Switch
Output switch
AC Output to
Critical Load
Figure 5-1. Main Elements of the UPS System
Backfeed Contactor
Maintenance B
yp
ass Switch
UPS Cabinet
The emergency bypass consists of a continuous static switch, and an optional backfeed protection
contactor.
T he backfeed protection contactor (if fitted) is located in series with the static switc h.
The static
switch is armed and ready during normal operation.
5-1
Eaton 93E MK2 UPS (10-40kVA, 380/400/415V) Installation and Operation