Delta Modulon DPH series - Battery Mode _ Dual Input_ Parallel Units

3-26
Modulon DPH Series
3.2.9 Battery Mode _ Dual 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 3-26 for the path of electrical power through the
parallel UPSs in battery mode.
MAIN
LOAD
BYPA.
MAIN
BYPA.
1
2
Q0Q2
Q0Q2
Q1 Q4
Q3
UPS
Q1 Q4
Q3
UPS
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Q5
Q5
Delta or non-Delta External Maintenance Bypass Cabinet
Batteries
Rectifier Inverter
Static Switch
Delta or non-Delta External Maintenance Bypass Cabinet
Batteries
Rectifier Inverter
Static Switch
(Figure 3-26: Battery Mode Diagram_ Dual Input Parallel Units)