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

3.2.13 Frequency Conversion Mode_ Dual 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
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 3-27 for the path of electrical power through the parallel UPSs in frequency
conversion mode.
NOTE:
inverters shut down, there is no bypass output.
UPS 1
BYPA.
MAIN
Batteries
UPS 2
BYPA.
MAIN
Batteries
(Figure 3-27: Frequency Conversion Mode Diagram_ Dual Input Parallel Units)
During frequency conversion mode (parallel), once all of the UPSs'
Q2
Q1
Rectifier
Q2
Q1
Rectifier
3-27
Static Switch
Inverter
Static Switch
Inverter
3 Operation Modes
Q3
Q3
LOAD