Eaton 93PM UPS 480V Three-Wire – 100 kW Frame Installation and Operation Manual 164000227—Rev 07 73
CChhaapptteerr 55 UUnnddeerrssttaannddiinngg UUPPSS OOppeerraattiioonn
55..11 UUPPSS SSyysstteemm OOvveerrvviieeww
The Eaton 93PM 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 38 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.
The emergency bypass consists of a continuous static switch, and bypass switchgear. The bypass switchgear
is located in series with the static switch. The static switch is armed and ready during normal operation.
This unit is a three-wire device. The loss of a single input phase will be considered a complete loss of input
power and discharge the battery to provide power to the load.
Figure 38. Main Elements of the UPS System
Battery
[Internal Battery (if applicable)
and/or External Battery Cabinet]
UPS
Battery
Switchgear
Inverter
Switchgear
Bypass
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
To Next Page
Loading...
