Xtreme Power Conversion Corporation
M90U-80 & 140 User’s Manual
Page 28
Uninterruptible Power Supply
3.2.2 Line Mode
In Line Mode, the rectifier derives power from the utility power and supplies DC power to the inverter and the
charger charges the battery. The inverter filters the DC power and converts it into pure and stable AC power to the
load.
Figure 3-4 : Line Mode Diagram
3.2.3 Battery Mode
The UPS automatically transfers to Battery mode if the utility power fails. There is no interruption in power to the
critical load upon failure.
In battery mode, the rectifier derives power from the battery and supplies DC power to the inverter. The inverter
filters the DC power and converts it into pure and stable AC power to the load.
Figure 3-5 : Battery Mode Diagram
3.2.4 Bypass Mode
Upon connecting to utility input power, the UPS is in Bypass mode before UPS is turned on (if BYPASS enable set
-
ting is Enabled), and charger function will be active when battery is present.
After UPS has been turned on, if the UPS encounters abnormal situations (over-temperature, overload …, etc.),
the static transfer switch will transfer the load from the inverter to the bypass source with no interruption. If the
transfer is caused by a recoverable reason, the UPS will turn back to line mode when abnormal situation is solved.
