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 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 3-23 for the path of electrical
power through the parallel UPSs in battery mode.
UPS 1
BYPA.
MAIN
Batteries
UPS 2
BYPA.
MAIN
Batteries
Modulon DPH Series
Q2
Q1
Q2
Q1
(Figure 3-23: Battery Mode Diagram_ Dual Input Parallel Units)
Static Switch
Rectifier Inverter
Static Switch
Rectifier Inverter
3-22
Q3
Q3
LOAD