The input may be single-phase or three-phase voltage, but the output is always single-phase voltage only . These on-line UPS are of the double conversion type.
The inverter section uses Pulse Width Modulation (PWM) technology to control high frequency power transistors (iGBT).
Only one series is available, the ASC SERIES.
The system includes:
A microprocessor controller module ensures waveform generation (PWM), voltage synchronization and regulation even when the UPS is powering non-linear loads. In addition, it ensures UPS measurement (voltmeters, ammeters, frequency meter) and monitoring (comprehensive alarm system).