This document is an application guide for variable frequency drives and soft starters. It introduces the features and characteristics of ATS22, ATS48, ATV21, ATV61, ATV71, ATV61 Plus, ATV71 Plus, AFE, and ATV1100, including power supply voltage range, motor power, variable frequency drive output frequency, control type, instantaneous overtorque, function, number of preset multi-stage speeds, I/O number, and communication.