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The soft starter is actually a device that controls the voltage and limits the starting current. It is used to start the motor and only changes the amplitude of the output voltage without changing the frequency. The inverter is used for the speed adjustment, and its output not only changes the voltage. And also change the frequency. Functionally, the frequency converter has all the functions of a soft starter, so it can be said that the frequency converter is a more powerful soft starter.
Although the soft starter solves the problem of motor starting, it has no obvious energy saving effect. In recent years, with the rapid rise of the localization process of China's inverters, the quality stability has progressed rapidly, coupled with the advantages of service and cost, the cost performance of frequency conversion speed regulation has been continuously improved, and the competitive advantage of quality and price has become more and more obvious. . It not only solves the problem of large inrush current generated by motor starting, but also has good energy saving effect and frequency conversion capability. Therefore, the pressure of the soft starter facing the replacement is getting larger and larger.
At present, only a small part of the working conditions use soft starters, such as the motor working load is more than 90%, and for other working conditions, it was previously started by soft start mode, and now most of the inverters are used, because the inverter The energy saving effect is about 30%.

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