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3-Phase Power Solutions Soft-Start Variable Frequency Drives
When you start a motor with on line power, it stresses the mechanical systems. Belts slip and chains jump, and high pressure develops in pipes and ducts. Reducing voltage and frequency starting will decrease this mechanical stress. VFDs work by varying output voltage along with output frequency. Output voltage varies with the frequency to control a motor's torque and speed. Controlling torque and speed results in a soft start as the motor's speed accelerates by a pre-programmed rate. Acceleration time in most VFDs may be varied from five to 360 seconds. How does the Soft Start Work? The soft start works by constantly monitoring the voltage and current going to the motor. According to a Department of Energy study, 44% of motors in industrial facilities operate at 40% or less of full load. The problem is that AC induction motors operate the most efficiently at around 75% of full rated load. With the soft start, it maintains the motor
at a constant, full operating speed. When the load on the motor
increases, the soft start reads this condition and increases the power to
the motor so it does not stall. The soft start works like a cruise
control works in cars. The soft start makes the motor more
efficient and, therefore, can save 15 to 40 percent in energy consumption. |
Applications for Soft Starts
With all the environmental concerns and energy prices continually soaring, the soft-start variable frequency drive, with its new technology, is a good economical solution. Soft start will improve and optimize the operation and will become increasingly more popular. Soft start will set a new standard for AC motor energy savings. Also, be sure to read more info on the web at Soft Start Drives.
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We
know that engineers have selected VFDs for energy saving and process
improvements for many years. These drives can also reduce mechanical
stress by using a soft start.
Again, welcome to our
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our site for selecting the best 3-phase power equipment
suited for your operational requirements. Through our recommendations, you will be able to select the best equipment designed especially for you by
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many years of dependable service. 