On-Line Mode_ Single Input_ Parallel Units - Delta Modulon DPH series User Manual

3.1.9 On-Line Mode_ Single Input_ Parallel Units

In On-Line mode (parallel), the total loads will be equally shared by parallel UPSs. If one
of the parallel units fails and its load is less than the total capacity of the remaining parallel
units, the failing UPS's output will be switched off and its load will be equally shared by
the remaining parallel units. If the failing UPS's load is larger than the total capacity of the
by bypass power. During On-Line mode (parallel), 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 On-Line mode.
1
MAIN
Batteries
2
MAIN
Batteries
(Figure 3-9: On-Line Mode Diagram_ Single Input Parallel Units)
Q3
Static Switch
Q2
Rectifier
Q1
Q5
Q3
Static Switch
Q2
Rectifier
Q1
Q5
3-9
Inverter
Q4
Inverter
Q4
3 Operation Modes
LOAD