Today the VFD is perhaps the most common type of output or load for a control system. As applications become more complicated the VFD has the capacity to control the quickness of the engine, the direction the engine shaft is definitely turning, the torque the electric motor provides to lots and any other motor parameter which can be sensed. These VFDs are also available in smaller sizes that are cost-effective and take up much less space.

The arrival of advanced microprocessors has allowed the VFD works as an exceptionally versatile device that not merely controls the speed of the engine, but protects against overcurrent during ramp-up and ramp-down conditions. Newer VFDs provide methods of braking, power boost during ramp-up, and a number of handles during ramp-down. The biggest cost savings that the VFD provides is that it can ensure that the motor doesn’t pull excessive current when it begins, therefore the overall demand element for the entire factory could be controlled to keep carefully the utility bill only possible. This feature alone can provide payback in excess of the price of the VFD in less than one year after purchase. It is important to keep in mind that with a traditional motor starter, they will draw locked-rotor amperage (LRA) when they are starting. When the locked-rotor amperage occurs across many motors in a manufacturing facility, it pushes the electrical demand too high which frequently outcomes in the plant paying a penalty for all of the electricity consumed during the billing period. Because the penalty may end up being just as much as 15% to 25%, the financial savings on a $30,000/month electric costs can be utilized to justify the purchase VFDs for practically every 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 controlled by a frequency and they were not commonly used. The earliest VFDs utilized linear amplifiers to regulate all aspects of the VFD. Jumpers and dip switches were used provide ramp-up (acceleration) and ramp-down (deceleration) features by switching larger or smaller resistors into circuits with capacitors to make different slopes.

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