Delta Modulon DPH series, User Manual

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Modulon DPH Series
3.2.8 On-Line Mode_ Dual Input_ Parallel Units
In On-Line 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
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
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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 3-22 for the path of electrical power through the parallel UPSs in On-Line mode.
MAIN
LOAD
MAIN
1
2
BYPA.
BYPA.
Q1
Q2
Q4
Q3
Batteries
Rectifier Inverter
Static Switch
Q1
Q2
Q4
Q3
Batteries
Rectifier Inverter
Static Switch
Q5
Q5
(Figure 3-22: On-Line Mode Diagram_ Dual Input Parallel Units)