Variable Speed Drive Basics

This presentation explains why Variable Speed Drives (VSDs) are used in many HVAC applications and how they operate. Explains variable torque vs constant torque loads. Describes the different Variable Speed Drive (VSD) terms commonly used in HVAC applications and defines the acronyms and names commonly used: 
Variable Speed Drive (VSD), Variable Frequency Drive (VFD), Adjustable Frequency Drive (AFD), Adjustable Speed Drive (ASD), Freq Drive Inverter.