Figure 50. Path Of Current Through The Ups In Battery Mode - Eaton Power Xpert 9395 Installation And Operation Manual

indicating SHUTDOWN IMMINENT. Unless the rectifier has a valid AC input soon, the output can be supported
for only two minutes before the output of the system shuts down. If the bypass source is available, the UPS
transfers to bypass instead of shutting down.
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
Online 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 50. Path of Current Through the UPS in Battery Mode

Bypass Input
Input
Breaker
Rectifier (CB1
Input
K1
Breakers Contactors
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.
Static
Switch
R c e f i t r e i
Battery
Converter
Closed
Open
Battery
Eaton ® Power Xpert ® 9395P-600 Installation and Operation Manual 164000562—Rev 08
K5
I v n r e r e t
K2
Battery
Breaker
Understanding UPS Operation
Output
K3
Main Power Flow
Trickle Current
Energized
De-Energized
107