Figure 6-20. Path Of Current Through The Upss In Battery Mode - Distributed Bypass - Eaton Power Xpert 9395P-900 Series Installation And Operation Manual

Bypass Input
Battery
Battery
Battery
Battery
Main Power Flow

Figure 6-20. Path of Current through the UPSs in Battery Mode - Distributed Bypass

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 Normal 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.
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Eaton Power Xpert 9395P-900 UPS Installation and Operation Manual P-164000501—Rev 09
UPS Input
UPS 1
UPS 2
UPS 3
UPS 4
Breakers
Closed
Open
Understanding UPS Operation
Tie Cabinet
UPS 1 Output
UPS 2 Output
UPS 3 Output
UPS 4 Output
Output to
Critical Load
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