Today the VFD could very well be the most common kind of output or load for a control system. As applications become more complicated the VFD has the ability to control the velocity of the engine, the direction the motor shaft is definitely turning, the torque the engine provides to lots and any other electric motor parameter which can be sensed. These VFDs are also available in smaller sized 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 also 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 that it can ensure that the motor doesn’t pull extreme current when it starts, therefore the overall demand aspect for the entire factory could be controlled to keep the utility bill as low as possible. This feature only can provide payback in excess of the price of the VFD in less than one year after buy. It is important to keep in mind that with a normal motor starter, they will draw locked-rotor amperage (LRA) 
if they are beginning. When the locked-rotor amperage happens across many motors in a manufacturing facility, it pushes the electrical demand too high which often outcomes in the plant spending a penalty for every one of the electricity consumed during the billing period. Since the penalty may end up being just as much as 15% to 25%, the cost savings on a $30,000/month electric costs can be utilized to justify the purchase VFDs for practically every engine in the plant actually if the application form may not require operating at variable speed.
This usually limited the size of the motor that may be controlled by a frequency plus they were not commonly used. The initial VFDs used 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 produce different slopes.
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