Each has its advantages and disadvantages:
In the water treatment process design, usually use the corresponding booster pump for any water equipment, for the impact on the circuit and electrical components to avoid the pump starts, need to choose the starting mode corresponding to the size of the power: if the pump power is less than 15KW can control (electromagnetic contactor) started directly; the pump motor power 15-30KW can star angle start, such as the requirements of stable starting can adopt soft start or start frequency; pump power is higher than 30KW must use soft start or start frequency. This paper introduces the difference between high power soft start and variable frequency starting, for your reference:
The pump frequency conversion start: start by frequency converter to transform alternating current voltage and frequency constant variable voltage and frequency to reduce the impact load caused by the motor starting, motor speed control, the start time of the current elongated, gradual, as to the purpose of soft start, but also can improve the efficiency of power grid and motor the. In fact, the inverter is mainly used in energy saving, through regulation, change the output voltage, current, frequency.
