Battery Mode _ Single Input_ Parallel Units - Delta Modulon DPH series User Manual

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 3-12 for the path of electrical power through the
parallel UPSs in battery mode.
1
MAIN
Batteries
2
MAIN
Batteries
Modulon DPH Series
Delta or non-Delta External Maintenance Bypass Cabinet
Q3
UPS
Q1 Q0
Q5
Delta or non-Delta External Maintenance Bypass Cabinet
Q3
UPS
Q1 Q0
Q5
Figure 3-12: Battery Mode Diagram_ Single Input Parallel Units
Static Switch
Rectifier Inverter
Static Switch
Rectifier Inverter
3-12
Q4
Q4
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