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Figure 75. Path of Current through the UPSs in Battery Mode – Distributed Bypass
Bypass Input
Battery
Battery
Battery
Battery
Main Power Flow
If at any time during the battery discharge the input power becomes available again, the rectifier begins to
supply DC current to the inverter. At this point, the UPS returns to Online mode. If at any time during the
battery discharge the AC input power becomes available again, each rectifier turns on, assumes the inverter
load from the batteries, and begins recharging the batteries. Depending on the total load and the duration of the
battery discharge, battery and rectifier input current limit alarms may be seen for a short time due to the current
required to recharge the batteries.
6 6 . . 5 5
M M u u l l t t i i p p l l e e U U P P S S D D i i s s t t r r i i b b u u t t e e d d B B y y p p a a s s s s S S y y s s t t e e m m O O n n e e l l i i n n e e C C o o n n f f i i g g u u r r a a t t i i o o n n s s
The distributed bypass system oneline drawings in this section show the simplified internal structure of the
UPS, battery supply, and basic maintenance bypass in a multiple UPS configuration. These onelines do not
show each UPM in the UPSs, but represent each UPS in the distributed bypass system. The following voltages
apply: 380V, 400V, 415V, 480V and 600V.
UPS Input
UPS 1
UPS 2
UPS 3
UPS 4
Breakers
Closed
Open
Eaton
®
Power Xpert
®
9395P-1200 Installation and Operation Manual 164000500—Rev 11
Understanding UPS Operation
Tie Cabinet
UPS 1 Output
UPS 2 Output
UPS 3 Output
UPS 4 Output
Output to
Critical Load
131
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