Today the VFD could very well be the most common kind of result or load for a control system. As applications are more complex the VFD has the capacity to control the swiftness of the engine, the direction the electric motor shaft is definitely 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 sizes that are cost-efficient and take up much less space.
The arrival of advanced microprocessors has allowed the VFD works as an exceptionally 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 provide methods of braking, power increase during ramp-up, and a number of controls during ramp-down. The biggest cost savings that the VFD provides can be that it can ensure that the engine doesn’t pull excessive current when it begins, so the overall demand aspect for the whole factory can be controlled to keep the utility bill as low as possible. This feature alone 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 normal motor starter, they will draw locked-rotor amperage (LRA) when they are beginning. When the locked-rotor amperage takes place across many motors in a manufacturing facility, it pushes the electric 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. Since the penalty may be just as much as 15% to 25%, the financial savings on a $30,000/month electric expenses can be utilized to justify the buy VFDs for virtually every electric motor in the plant actually if the application might not require functioning at variable speed.
This usually limited how big is the motor that could be managed by a frequency plus they were not commonly used. The earliest VFDs used linear amplifiers to regulate all areas of the VFD. Jumpers and dip switches were utilized provide ramp-up (acceleration) and ramp-down (deceleration) features by switching larger or smaller resistors into circuits with capacitors to make different slopes.
Have you or members of your family taken into consideration Variable Speed Gear Motor?