In essence, complicated algorithms are used to monitoring, interpret and respond to current feedback to provide precise motor control. VFDs can implement this control using various different and complicated control schemes. Self-sensing vector control is a control method that provides a more fine-tuned control of the motor’s speed. These V/f patterns can be adjusted to provide high starting torque or reduced to optimize efficiency for variable torque loads that do not require constant voltage to frequency relationships. V/f control fixes the drive’s output to a predefined voltage and frequency curve for the motor to follow as the VFD’s speed command is adjusted. It is the most basic of the three topologies. Volts-per-Hertz (V/f) control is the most commonly used motor control method. These control capabilities can be classified into three groups: volts-per-hertz control, self-sensing vector control, and closed-loop vector control. The control method dictates the capabilities enacted by the drive to regulate motor speed. The first setting commonly set by VFD installers is the control method. What is a control method as it applies to VFDs? Control method influence on VFD programming 1. The below details a list of the top five parameter settings programmed by VFD installers to explain what the settings are and why they’re needed. Typically, no more than a dozen settings are adjusted for an application. In most cases, the VFD’s default settings will be sufficient for an application and not required any adjustment.
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