Online Mode_ Single Input_ Parallel Units - Delta Modulon DPH Series User Manual

3.1.9 Online Mode_ Single Input_ Parallel Units

In online mode (parallel), the total loads will be equally shared by the parallel UPSs. If one
of the parallel units fails and its load is less than the total capacity of the remaining parallel
parallel unit. If the failing UPS's load is larger than the total capacity of the remaining parallel
During online mode, each UPS's tri-color LED illuminates green and each UPS's LCD
shows the text 'On-Line' in the upper right corner. Please refer to Figure 3-9 for the path of
electrical power through the parallel UPSs in online mode.
UPS 1
MAIN
Batteries
UPS 2
MAIN
Batteries
Modulon DPH Series
Q2
Q1
Q2
Q1
(Figure 3-9: Online Mode Diagram_ Single Input Parallel Units)
Static Switch
Rectifier Inverter
Static Switch
Rectifier Inverter
3-8
Q3
Q3
LOAD