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Chapter 5
Understanding UPS Operation
5.1
UPS System Overview
The Eaton 93E 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
system.
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 power
system (such as a generator) or shut down your critical load in an orderly manner.
AC Input to
Rectifier/
Charger
AC Input to
Bypass
The emergency bypass consists of a continuous static switch, and an optional backfeed protection contactor. The
backfeed protection contactor (if fitted) is located in series with the static switch. The static switch is armed and
ready during normal operation.
Input
Input
Switch
Relay
Rectifier
(Optional Dual Input)
Bypass Input Switch
(Optional)
Backfeed Contactor
Figure 5-1. Main Elements of the UPS System
External Battery cabinet
Battery
Relay
Battery
Converter
Inverter
Power Module
Digital Metering
Static
Switch
Maintenance Bypass Switch
UPS Cabinet
Eaton 93E UPS (15-80 kVA, 380/400/415V) Installation and Operation Manual
Output
Relay
Output switch
AC Output to
Critical Load
5-1
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