15
3rd2
Normal Mode
Energy is drawn from the mains input.
Loads are fed via the rectifier and the inverter. The AC voltage at the input is converted to a DC voltage
by the rectifier. The inverter converts this DC voltage to an AC voltage with a stable sinusoidal waveform,
amplitude and frequency.
Output voltage is sinusoidal and has a regulated amplitude and frequency. It is independent from the input
voltage.
The inverter is synchronized in frequency with the bypass mains input to enable load transfer to the
bypass supply without any interruption, in case of an overload or inverter failure.
Voltage and frequency of the mains input shall be in their tolerance limits, and both the rectifier and the
inverter shall be enabled for the UPS to operate in this mode.
When the upper provisions are met, the UPS works in normal mode in the following conditions:
If the inverter priority is selected.
If the bypass priority is selected but bypass is disabled or frequency/waveform/rms value of
bypass mains voltage is not in acceptable limits.
3rd3
Battery Mode
Energy is drawn from the batteries. Loads are fed via the inverter.
Output voltage is sinusoidal and has a regulated amplitude and frequency. It is independent from the
battery voltage.
Battery voltage shall be in acceptable limits and the inverter shall be enabled for the UPS to operate in this
mode.
When the upper provisions are met, the UPS works in battery mode in the following conditions:
If rectifier is disabled.
If the rectifier is disabled or frequency/waveform/rms value of mains voltage is not in acceptable
limits.
