3-11
3
Operation Modes
3.1.10
Battery Mode_ Single Input_ Parallel Units
If the main AC source cannot supply power, for example, when unstable voltage or a power
outage occurs, all parallel UPSs will automatically transfer from online mode to battery
mode. During the conversion process, output voltage remains the same, and during battery
mode, each UPS’s tri-color LED illuminates yellow and each UPS’s LCD shows the text
‘Battery’ in the upper right corner. Please refer to Figure 3-10 for the path of electrical
power through the parallel UPSs in battery mode.
MAIN
LOAD
MAIN
1
2
Q1
Q2
Q4
Q3
Batteries
Rectifier Inverter
Static Switch
Q1
Q2
Q4
Q3
Batteries
Rectifier Inverter
Static Switch
Q5
Q5
(Figure 3-10: Battery Mode Diagram_ Single Input Parallel Units)
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