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March 6, 2020

Today the VFD could very well be the most common kind of output or load for a control program. As applications are more complex the VFD has the capacity to control the velocity of the engine, the direction the electric motor shaft is certainly turning, the torque the electric motor provides to a load and any other engine parameter that can be sensed. These VFDs are also available in smaller sizes that are price-effective and take up less space.

The arrival of advanced microprocessors has allowed the VFD works as an extremely versatile device that not merely controls the speed of the motor, but protects against overcurrent during ramp-up and ramp-down conditions. Newer VFDs provide methods of braking, power enhance during ramp-up, and a variety of controls during ramp-down. The biggest financial savings that the VFD provides is certainly that it can ensure that the motor doesn’t pull extreme current when it starts, so the overall demand element for the whole factory can be managed to keep the utility bill as low as possible. This feature only can provide payback more than the cost of the VFD in less than one year after buy. It is important to keep in mind that with a traditional motor starter, they will draw locked-rotor amperage (LRA) if they are beginning. When the locked-rotor amperage takes place across many motors in a manufacturing plant, it pushes the electrical demand too high which often results in the plant paying a penalty for all of the electricity consumed through the billing period. Since the penalty may become as much as 15% to 25%, the financial savings on a $30,000/month electric bill can be used to justify the purchase VFDs for virtually every engine in the plant even if the application might not require operating at variable speed.

This usually limited the size of the motor that may be controlled by a frequency plus they weren’t commonly used. The earliest VFDs utilized linear amplifiers to regulate all areas of the VFD. Jumpers and dip switches were utilized provide ramp-up (acceleration) and ramp-down (deceleration) features by switching larger or smaller resistors into circuits with capacitors to produce different slopes.

Have you considered Variable Speed Gear Motor as a normal component of your life?