ABB Xtra VFI Double Conversion Mode for UPS

This document describes ABB's Xtra VFI operating mode for uninterruptible power supplies (UPS), which automatically scales active modules to match load power, maximizing double conversion efficiency especially at low loads below 25% of system capacity. It details key features such as automatic module standby, redundancy configuration, fault tolerance, and a graphical interface for monitoring energy savings and performance parameters.