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

3.2.8 Online Mode_ Dual 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
power. 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 3-22 for the
path of electrical power through the parallel UPSs in online mode.
UPS 1
BYPA.
MAIN
Batteries
UPS 2
BYPA.
MAIN
Batteries
(Figure 3-22: Online Mode Diagram_ Dual Input Parallel Units)
Q2
Static Switch
Q1
Rectifier
Q2
Static Switch
Q1
Rectifier
3-21
Inverter
Q3
Inverter
Q3
3 Operation Modes
LOAD