Frequency Conversion Mode_ Single Input_ Parallel Units - Delta Modulon DPH series User Manual

3.2.13 Frequency Conversion Mode_ Single Input_ Parallel Units

To activate frequency conversion mode, please refer to 6.2.6 Frequency Conversion Mode
Start-up Procedures, 7.6 Main Screen and 7.10.2 Mode Setting.
For parallel application, after each of the parallel UPSs is manually set in frequency conversion
mode, each inverter will automatically select 50Hz or 60Hz as the fixed output frequency.
After the output frequency is determined, each system will automatically disable the bypass
function. Please note that, once each inverter shuts down, there is no bypass output. During
frequency conversion mode, each UPS's tri-color LED illuminates green and each UPS's
LCD shows the text 'Frequency Conversion' in the upper right corner. Please see Figure
3-30 for the path of electrical power through the parallel UPSs in frequency conversion mode.
shut down, there is no bypass output.
1
BYPA.
MAIN
Batteries
2
BYPA.
MAIN
Batteries
(Figure 3-30: Frequency Conversion Mode Diagram_ Dual Input Parallel Units)
During frequency conversion mode (parallel), once all of the UPSs' inverters
Delta or non-Delta External Maintenance Bypass Cabinet
Q3
UPS
Q2 Q0
Q1
Q5
Delta or non-Delta External Maintenance Bypass Cabinet
Q3
UPS
Q2 Q0
Q1
Q5
Static Switch
Rectifier Inverter
Static Switch
Rectifier Inverter
3-31
3 Operation Modes
Q4
Q4
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