Today the VFD is perhaps the most common type of output or load for a control program. As applications become more complicated the VFD has the capacity to control the swiftness of the electric motor, the direction the electric motor shaft is turning, the torque the engine provides to a load 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 less space.
The arrival of advanced microprocessors has allowed the VFD works as an extremely versatile device that not only controls the speed of the electric motor, 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 settings during ramp-down. The biggest cost savings that the VFD provides is certainly that it can make sure that the engine doesn’t pull extreme current when it begins, therefore the overall demand factor for the whole factory can be controlled to keep the utility bill as low as possible. This feature only can provide payback in excess of the cost 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 beginning. When the locked-rotor amperage occurs across many motors in a manufacturing plant, it pushes the electrical demand too high which often outcomes in the plant having to pay a penalty for every one of the electricity consumed through 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 bill can be utilized to justify the buy VFDs for practically every electric motor in the plant also if the application might not require working at variable speed.
This usually limited how big is the motor that could be controlled by a frequency plus they were not commonly used. The earliest VFDs utilized linear amplifiers to control all areas 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 create different slopes.
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