Eaton 93E UPS (20–30 kVA, 208/220V) Installation and Operation Manual 164000301—Rev 04 55
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The Eaton 93E UPS is a continuous-duty, solid-state, transformerless, 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 31 shows the main elements
of the UPS system.
If utility power is interrupted or falls outside the parameters specified in Chapter 10, 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.
Figure 31. Main Elements of the UPS System
Battery
[Internal Battery (if applicable)
and/or External Battery Cabinet]
UPS
Battery
Switchgear
Inverter
Switchgear
Power Module
Rectifier
Switchgear
AC Input to
Rectifier/
Charger
AC Input to
Bypass
AC Output
to Critical
Load
Digital
Metering
Static
Switch
Battery
Converter
Bypass
Switchgear
Rectifier
Inverter
Input
Breaker
The emergency bypass consists of a continuous static switch, and a bypass switchgear. The bypass
switchgear is located in series with the static switch. The static switch is armed and ready during normal
operation.
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