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 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, and 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 3-10 for the path of electrical
power through the parallel UPSs in Battery mode.
1
MAIN
Batteries
2
MAIN
Batteries
(Figure 3-10: Battery Mode Diagram_ Single Input Parallel Units)
Modulon DPH Series
Q3
Static Switch
Q2
Rectifier
Q1
Q5
Q3
Static Switch
Q2
Rectifier
Q1
Q5
3-10
Inverter
Q4
Inverter
Q4
LOAD