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3-1-8. CVCF Mode
The CVCF mode is enabled through the LCD setting menu. The output frequency will be fixed at 50Hz or 60Hz
according to setting of “Freq”. In CVCF mode, the rectifier derives power from the utility power, supplies DC
power to the inverter and the charger charges the battery. The inverter filters the DC power and converts it into
pure and stable AC power to the load.
CVCF Mode Diagram
3-1-9. ECO Mode
The ECO mode is enabled through the LCD setting menu. In ECO mode, the load is powered by bypass when the
bypass voltage and frequency are within the acceptable ranges. If the bypass voltage or frequency is out of range,
the UPS will transfer the power source of load from bypass to inverter. In order to shorten the transfer time, the
rectifier and inverter are working when the UPS is in ECO mode.
ECO Mode Diagram
3-1-10. Shutdown Mode
When the UPS is in the off state and the utility power source is absent, the UPS will enter into shutdown mode.
When the UPS enters this mode, it is going to shut off the control power of UPS. The rectifier, charger and
inverter are all in off state.
