Operating principle of an online UPS part one

Normal mode
This is the most frequent operating condition: the energy is drawn from the primary mains power supply and is converted and used by the online UPS to generate the output voltage to power the loads connected. The inverter is
constantly synchronised with the auxiliary mains to enable load transfer to bypass (due to an overcurrent or inverter shutdown) without any break in the power supply to the load. The battery charger supplies the energy required to maintain or recharge the battery.

Bypass mode:

In case of inverter failure, the load is automatically transferred onto the auxiliary mains without any interruption in the power supply, and may occur in the following situations:

•      in the event of a temporary overload, the inverter continues to power the load. If the condition persists, output is switched onto the auxiliary mains via the automatic bypass.
•       . Normal operation, which is from inverter, returns automatically a few seconds after the overload disappears.
• ·         when the voltage generated by the inverter goes is out of tolerances due to a major overload or a fault on the inverter
• ·         when the internal temperature exceeds the maximum value allowed. Consulneowatt.com