Motor Protection Guide

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Load-side solutions for power quality in systems using Siemens’ Variable Frequency Drives

How Variable Frequency Drives (VFDs) Work

VFDs serve as a way of controlling the speed of AC motors by varying the frequency of the power source using pulse width modulation (PWM). This is done by switching the transistors, IGBTs, or thyristors, on and off continuously. While the introduction of VFDs has brought precise control of motors and greater energy savings, it has also introduced new problems that, left unaddressed, can cause downtime.

  • SP-001-E Load-side solutions for power quality in systems using Variable Frequency Drives