The function of motor soft starter and its difference from frequency converter
Soft starter is a novel motor control device that integrates motor soft start, soft stop, and multiple protection functions. But unlike traditional step-down starting methods, the soft starting device belongs to stepless step-down starting. At present, the most mature and commonly used soft start device is the thyristor series soft start device.
Soft starters and frequency converters are two completely different products for different purposes. A frequency converter is used in places where speed regulation is required, and its output not only changes the voltage but also the frequency; The soft starter is actually a voltage regulator used when starting a motor, and the output only changes the voltage without changing the frequency. The frequency converter has all the functions of a soft starter, but its price is much higher than that of a soft starter and its structure is also much more complex.
Soft starters are used in situations where voltage reduction is required for starting and stopping. The rotational speed of the electrode remains unchanged.
The frequency converter is used in places where speed regulation, torque regulation, constant voltage, and V/F speed regulation are required, and the frequency determines the speed.
The biggest difference between a soft starter and a frequency converter is that the frequency converter can be set arbitrarily, while the starter only plays a soft start and soft stop role.
The soft starter panel usually has adjustable control parameters such as soft start time, initial starting voltage, starting current limit, soft stop time, soft stop level drop voltage (pump stop function), and pulse jump start (for sudden load). The actual operation can be set or selected according to the specific situation of the equipment motor in the project and the instructions of the soft starter.
