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Operation Modes
3.2.10 Bypass Mode_ Dual Input_ Parallel Units
In parallel mode, when all inverters encounter abnormal situations such as overload, short
circuit, abnormal output voltage or low battery, they will automatically shut themselves down.
Meanwhile, if all UPSs detect the bypass AC source is normal, they will automatically switch
to bypass mode to protect the connected critical loads from power interruption. The critical
loads will be equally shared by all parallel units. After the abnormalities mentioned above
are eliminated, the UPSs will switch back to online mode from bypass mode. During bypass
mode, each UPS’s tri-color LED illuminates yellow and each UPS’s LCD shows the text
‘Bypass’ in the upper right corner. Please see
Figure 3-27
for the path of electrical power
through the parallel UPSs in bypass mode.
MAIN
LOAD
BYPA.
MAIN
BYPA.
1
2
Q0 Q2
Q0 Q2
Q1 Q4
Q3
UPS
Q1 Q4
Q3
UPS
Q5
Q5
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Delta or non-Delta External Maintenance Bypass Cabinet
Batteries
Rectifier Inverter
Static Switch
Delta or non-Delta External Maintenance Bypass Cabinet
Batteries
Rectifier Inverter
Static Switch
(Figure 3-27: Bypass Mode Diagram_ Dual Input Parallel Units)