Battery Mode_ Dual Input_ Parallel Units - Delta Modulon DPH series User Manual

3.2.9 Battery Mode_ Dual Input_ Parallel Units

If the main AC source is abnormal, for example, when unstable voltage or a power outage
occurs, all parallel UPSs will automatically transfer from On-Line mode to Battery mode.
During the conversion process, output voltage remains the same. During Battery mode
(parallel), 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 3-23 for the path of electrical
power through the parallel UPSs in Battery mode.
1
BYPA.
MAIN
Batteries
2
BYPA.
MAIN
Batteries
(Figure 3-23: Battery Mode Diagram_ Dual Input Parallel Units)
Q3
Static Switch
Q2
Rectifier
Q1
Q5
Q3
Static Switch
Q2
Rectifier
Q1
Q5
3-23
Inverter
Q4
Inverter
Q4
3 Operation Modes
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