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Eaton 9395XC UPS 1200kW/1200kVA, 1350kW/1350kVA or 1500kW/1500kVA 164001079—Rev 01
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The UPS automatically switches to Bypass mode if it detects an overload, load fault, or internal failure. The UPS
can also be transferred from Normal mode to Bypass mode manually. The bypass source supplies the
commercial AC power to the load directly.
shows the path of electrical power through the UPS
system when operating in Bypass mode.
In Bypass mode, the output of the system is provided with three-phase AC power directly from the system
input. While in this mode, the output of the system is not protected from voltage or frequency fluctuations or
power outages from the source. Some power line filtering and spike protection is provided to the load but no
active power conditioning or battery support is available to the output of the system in the Bypass mode of
operation.
The internal bypass is comprised of a SCR continuous static switch. The static switch is used instantaneously
anytime the inverter is unable to support the applied load. The continuous static switch is wired in series with
the customer supplied Bypass Breaker with UVR and together they are wired in parallel with the rectifier and
inverter.
The critical load is not protected from voltage or frequency fluctuations or power outages while the UPS is in
Bypass mode.
ATTENTION!
Les charges critiques ne sont pas protégées des fluctuations de tension ou de fréquence ni des pannes de
courant lorsque l’onduleur est en mode Contournement.
The Eaton 9395XC UPS provides backfeed detection and protection through a UVR mechanism of the bypass
input breaker. An optional Bypass Contactor is available in the I/O Cabinet.
Figure 47. Path of Current Through the UPS in Bypass Mode
Static
Switch
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tr
e
v
n
I
r
e
if
it
c
e
R
Battery
Converter
Battery
Battery
Breaker
Main Power Flow
Trickle Current
Energized
De-Energized
Bypass Input
Rectifier
Input
Output
Closed
Open
Breakers
Contactors
K1
Summary of Contents for 9395XC
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