How do you configure and control a VFD bypass using a PLC or HMI?
A variable frequency drive (VFD) is a device that controls the speed and torque of an electric motor by varying the frequency and voltage of the power supply. A VFD bypass is a feature that allows the motor to run at full speed directly from the line power, bypassing the VFD, in case of a fault or maintenance. A VFD bypass can be configured and controlled using a programmable logic controller (PLC) or a human-machine interface (HMI), depending on the application and preference. In this article, we will discuss some of the options and considerations for using a PLC or HMI to control a VFD bypass.