Eaton Power Xpert 9395P-900 Series - Figure 6-4. Path of Current through the UPS in Battery Mode

Understanding UPS Operation
Eaton
®
Power Xpert
®
9395P-900 UPS Installation and Operation Manual P-164000501—Rev 09 www.eaton.com/powerquality 6-7
If at any time during the battery discharge the input power becomes available again, contactors K1 and K5 close
and the rectifier begins to supply DC current to the converter and inverter. At this point, the unit returns to
Normal mode. Depending on the total load and the duration of the battery discharge, battery current limit alarms
may be seen for a short time due to the current required to recharge the battery.
Figure 6-4. Path of Current Through the UPS in Battery Mode
Static
Switch
K5
retrevnIreifitceR
K1 K3
Battery
Converter
Battery
Battery
Breaker
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.