Today the VFD could very well be the most common type of output or load for a control program. As applications are more complex the VFD has the capacity to control the speed of the motor, the direction the engine shaft can be turning, the torque the motor provides to lots and any other electric motor parameter which can be sensed. These VFDs are also obtainable in smaller sizes that are price-efficient and take up much less space.

The arrival of advanced microprocessors has allowed the VFD works as an extremely 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 improve during ramp-up, and a variety of controls during ramp-down. The biggest financial savings that the VFD provides is definitely that it can make sure that the electric motor doesn’t pull extreme current when it begins, therefore the overall demand element for the whole factory can be controlled to keep the utility bill only possible. This feature alone can provide payback in excess of the cost of the VFD in less than one year after buy. It is important to keep in mind that with a normal motor starter, they’ll draw locked-rotor amperage (LRA) if they are starting. When the locked-rotor amperage takes place 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 all of the electricity consumed during the billing period. Because the penalty may end up being as much as 15% to 25%, the savings on a $30,000/month electric expenses can be utilized to justify the purchase VFDs for virtually every motor in the plant also if the application may not require operating at variable speed.

This usually limited the size of 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 utilized provide ramp-up (acceleration) and ramp-down (deceleration) features by switching bigger or smaller sized resistors into circuits with capacitors to develop different slopes.

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