Eaton
®
Power Xpert
®
9395P-600 (300V-600V) Installation and Operation Manual 164000710—Rev 07
125
Figure 62. Path of Current Through the UPS in Online Mode
Static
Switch
r
e
tr
e
v
n
I
r
e
if
it
c
e
R
K1
K3
Battery
Converter
Battery
Battery
Breaker
Main Power Flow
Trickle Current
Energized
De-Energized
Closed
Open
Breakers
Contactors
Static
Switch
K5
r
e
tr
e
v
n
I
r
e
if
it
c
e
R
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.
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.
66..22..33
EEnneerrggyy S
Saavveerr S
Syysstteem
m ((EES
SS
S)) M
Mooddee
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, commercial AC power is supplied directly to the critical load through
the continuous static switch. Power line filtering and spike protection for the load are provided by the input and
output filter networks, and the UPS actively monitors the critical bus for power disturbances. When in this
mode, the input and output contactors are closed and the link is maintained through the diode bridge.
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