Eaton
®
Power Xpert
®
9395P-900 Installation and Operation Manual 164000501—Rev 12
123
C
Chhaapptteerr 66 U
Unnddeerrssttaannddiinngg U
UP
PS
S O
Oppeerraattiioonn
66..11
U
UP
PS
S S
Syysstteem
m O
Ovveerrvviieew
w
The Eaton 9395P-900 UPS is a continuous-duty, solid–state, transformerless (at 480 Vac), 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.
shows the main elements
of the UPS system.
If utility power is interrupted or falls outside the parameters specified in
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 68. Main Elements of the UPS System
Backfeed
Protection
Contactor
K5
Static
Switch
Digital
Metering
Inverter
Power Module
Rectifier
Battery
Converter
Output
Contactor
K3
Battery
Contactor
K2
AC Input to
Rectifier/
Charger
Input
Breaker
CB1
(optional)
Input
Contactor
K1
AC Input to
Bypass
UPS Cabinet
AC Output
to Critical
Load
Battery
Breaker
Battery
Battery Cabinet or
Battery String
NOTE
On a UPS configured as an Input Output Module (IOM), the bypass input, static switch, and backfeed protection contactor (K5) are not present.
The emergency bypass consists of a continuous static switch, and a backfeed protection contactor K5. The
bypass breaker (if installed) is located in parallel with the static switch. The backfeed protection contactor is
located in series with the static switch. The static switch is armed and ready during normal operation.
