Today the VFD could very well be the most common kind of output or load for a control system. As applications are more complex the VFD has the capacity to control the speed of the electric motor, the direction the electric motor shaft is usually turning, the torque the engine provides to a load and any other electric motor parameter which can be sensed. These VFDs are also obtainable in smaller sized sizes that are price-effective and take up 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 motor, but protects against overcurrent during ramp-up and ramp-down conditions. Newer VFDs provide methods of braking, power improve during ramp-up, and a variety of regulates during ramp-down. The biggest cost savings that the VFD provides can be that it can make sure that the motor doesn’t pull excessive current when it begins, therefore the overall demand element for the entire factory can be controlled to keep the domestic 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 important to remember that with a traditional motor starter, they’ll 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 electric demand as well high which often results in the plant paying a penalty for every one of the electricity consumed during the billing period. Because the penalty may become as much as 15% to 25%, the financial savings on a $30,000/month electric costs can be used to justify the buy VFDs for practically every motor in the plant actually if the application might not require working at variable speed.

This usually limited the size of the motor that may be controlled by a frequency and they weren’t commonly used. The initial VFDs utilized linear amplifiers to control 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 sized resistors into circuits with capacitors to create different slopes.

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