Eaton Power Xpert 9395P-900 Series - Figure 6-2. Path of Current through the UPS in Online Mode

Understanding UPS Operation
Eaton
®
Power Xpert
®
9395P-900 UPS Installation and Operation Manual P-164000501—Rev 09 www.eaton.com/powerquality 6-3
Figure 6-2. Path of Current Through the UPS in Online Mode
If the utility AC power is interrupted or is out of specification, the UPS automatically switches to Battery mode
to support the critical load without interruption. When utility power returns, the UPS returns to Normal mode.
If the UPS becomes overloaded or unavailable, the UPS switches to Bypass mode. The UPS automatically
returns to Normal mode when the overload condition is cleared and system operation is restored within
specified limits.
If the UPS suffers an internal failure, it switches automatically to Bypass mode and remains in that mode until
the failure is corrected and the UPS is back in service.
Static
Switch
retrevnIreifitceR
K1 K3
Battery
Converter
Battery
Battery
Breaker
Main Power Flow
Trickle Current
Energized
De-Energized
Closed
Open
Breakers Contactors
Static
Switch
K5
retrevnIreifitceR
K1 K3
Main Power Flow
Trickle Current
Energized
De-Energized
Closed
Open
Breakers Contactors
K2
Bypass Input
Rectifier
Input
Output
Input
Breaker
(CB1
NOTE On a UPS configured as an IOM, the bypass input, static switch, bypass breaker (CB4), and K5 are not present.
NOTE On a UPS configured with a Continuous Static Switch (CSS), bypass breaker (CB4) is not present.
NOTE Bypass mode is not available on a UPS configured as an IOM.