Today the VFD is perhaps the most common kind of output or load for a control program. As applications become more complicated the VFD has the capacity to control the swiftness of the motor, the direction the electric motor shaft is turning, the torque the electric motor provides to a load and any other motor parameter that can be sensed. These VFDs are also available in smaller sized sizes that are price-efficient and take up less space.

The arrival of advanced microprocessors has allowed the VFD works as an exceptionally versatile device that not only controls the speed of the motor, but protects against overcurrent during ramp-up and ramp-down conditions. Newer VFDs provide ways of braking, power enhance during ramp-up, and a number of controls during ramp-down. The biggest cost savings that the VFD provides is that it can make sure that the motor doesn’t pull extreme current when it begins, so the overall demand aspect for the whole factory can be managed to keep the utility bill as low as possible. This feature only can provide payback in excess of the price of the VFD in under one year after purchase. It is essential to keep in mind that with a normal motor starter, they will draw locked-rotor amperage (LRA) when they are beginning. When the locked-rotor amperage occurs across many motors in a manufacturing facility, it pushes the electrical demand as well high which often results in the plant paying a penalty for every one of the electricity consumed through the billing period. Because the penalty may be as much as 15% to 25%, the savings on a $30,000/month electric bill can be used to justify the buy VFDs for practically every electric motor in the plant actually if the application may not require functioning at variable speed.

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

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