Block Diagram And Main Elements - ABB MegaFlex UL S1 Series User Manual

13/86 MegaFlex 1000 to 1600 UPS User Manual / REV-A

4.1 Block diagram and main elements

Fig. 4.1-1 Block Diagram MegaFlex 1000 to 1600
The MegaFlex 1000 to 1600 system can be divided into the following main elements:
Control System
MegaFlex 1000 to 1600 is designed with microprocessor-controlled signal processing circuits.
The interface between the operator and the unit is provided by the monitoring system on the front panel.
This monitoring system consists of an active mimic diagram, a keyboard and a backlit display.
Rectifier
The Active IGBT Rectifier converts the 3-phase utility voltage into a controlled and regulated DC-voltage,
supplying the Inverter and to charge the Battery through the Battery-charger.
Thanks to modulation strategy applied to IGBT Bridge, the rectifier provides clean input power in terms of low
THDi and unity power factor.
Inverter
The Inverter converts the DC voltage into a three-phase AC-voltage with constant amplitude and frequency, which
is completely independent and isolated from the AC-input voltage.
Automatic Bypass
The Automatic Bypass consists of a static semiconductor-switch (SSM: Static Switch Module), used to provide an
uninterrupted transfer of the Load from Inverter to Utility.
Back-feed Protection
MegaFlex 1000 to 1600 UPS is equipped with an automatic system for the protection against voltage back
feeding towards Utility, through the Bypass (UL 1778 and CSA C22.2 no. 107.3).
This protection works automatically by opening contactor K6 (in series with the thyristors of the static switch).
Battery
The Battery supplies the DC power to the Inverter when the Utility is out of acceptable tolerances.