Principle of frequency conversion and constant pressure water supply system
This equipment is manufactured by Wenzhou Haidoneng Environmental Protection Equipment Technology Co., Ltd. It is a 10-ton automatic pure water equipment with softening reverse osmosis and variable frequency constant pressure water supply system.
1, Frequency conversion and constant pressure water supply system for pipe network water pressure (or the user water flow) set parameters, through computer control inverter output frequency to automatically adjust the rotate speed of water pump motor, realize the pipe network pressure closed loop regulation (PID), automatic water supply system, steady to set pressure value: the water consumption increases, the frequency increases, the water pump speed is accelerated,Water supply increases accordingly;When the water consumption is reduced, the frequency is reduced, the pump speed is slowed down, and the water supply is correspondingly reduced, so as to ensure the water supply efficiency of the user's requirements for water pressure and water, and to achieve the purpose of improving the quality and efficiency of water supply, "how much water is used, how much water is supplied ";The equipment does not need to build high water tank, water tower, water quality without secondary pollution, is an ideal modern building water supply equipment.
2. Although the pump is running at low speed, the working current of the motor is small.However, when the user's water consumption changes frequently, the motor will be in a state of frequent rising and falling speed, and the current of rising and falling speed may slightly exceed the rated current of the motor, resulting in overheating of the motor.Therefore, the thermal protection of the motor is necessary.For the temperature rise accumulated due to frequent rise and fall, the electronic thermal protection function in the frequency converter is difficult to play a protective role, so thermal relay should be used to carry out the thermal protection of the motor.In terms of main function presetting, the highest frequency shall be the rated frequency of the motor as the highest working frequency of the frequency converter.In the case of PID regulator, the time of speed rise and speed fall should be set as short as possible, so as not to affect the dynamic response process determined by PID regulator.If the frequency converter itself has PID regulation function, as long as the PID function is set in the preset is effective, the set speed up and speed down time will automatically fail.
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