Phase LHX Series - Introduction

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INTRODUCTION
Phase Technologies’ variable frequency drives (VFDs) are inverter-based devices that convert AC power to
a three-phase variable frequency output which provides speed control for three-phase AC motors. The drives
offer advanced motor control features through an intuitive, easy-to-use interface.
The following block diagrams demonstrate how the drives convert incoming AC power to DC, then utilize an
inverter module to generate three-phase variable voltage and frequency output to control the speed of a motor.
Motor
DC bus
capacitor
DC Choke
(≥30HP)
AC to DC IGBT converter module DC to AC IGBT converter module
Figure 1 – DXL Series Block Diagram
L/C Filter
Motor
DC bus
capacitor
AC to DC IGBT converter module
DC to AC IGBT converter module
Figure 2 – 3LHX Series Block Diagram