Eaton Power Xpert 9395P - Figure 63. Path of Current through the UPS in Online Mode

Eaton Power Xpert 9395 UPS Installation and Operation Manual 164201764—Rev 14 111
Figure 63. Path of Current Through the UPS in Online Mode
Static
Switch
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K1 K3
Battery
Converter
Battery
Battery
Breaker
Main Power Flow
Trickle Current
Energized
De-Energized
Closed
Open
Breakers Contactors
Static
Switch
K5
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K1 K3
Main Power Flow
Trickle Current
Energized
De-Energized
Closed
Open
Breakers Contactors
K2
Bypass Input
Rectifier
Input
Output
Bypass
Breaker
(CB4)
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.
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 Online mode.
NOTE Bypass mode is not available on a UPS configured as an IOM.
If the UPS becomes overloaded or unavailable, the UPS switches to Bypass mode. The UPS automatically
returns to Online 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.
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NOTE VMMS and ESS modes are mutually exclusive. If ESS mode is enabled, VMMS mode is
disabled.
When the UPS is operating in ESS mode, the bypass source supplies the commercial AC power to the load
directly through the static switch. Some power line filtering and spike protection is provided to the load but no
active power conditioning or battery support is available. All power converters are off and are in the ready state
Understanding UPS Operation