当用水量大时，水压降低，变频器输出频率升高，当变频器运行频率到达上限时

When the water consumption is large, the water pressure decreases and the inverter output frequency increases. When the inverter operating frequency reaches the upper limit and runs stably for 10s, if the pipe network pressure is lower than the water pressure set value at this time, increase No. 2 Water pump. Under the logic control of the PLC, the electromagnetic switch connecting the No. 1 pump motor and the inverter is disconnected, the No. 1 pump motor is switched to power frequency operation, and the inverter is connected with the No. 2 pump motor to make the No. 2 pump motor work in speed regulation. status. <br>When the water consumption is small, the water pressure increases, the output frequency of the inverter decreases, and the pump reduction process is entered, and the speed of the water pump motor decreases. Press the set value and stop the water pump controlled by the inverter. If the No. 1 pump is running at the power frequency, switch the No. 1 pump from the power frequency operation to the variable frequency operation.

When the water consumption is large, the water pressure decreases, the frequency of the drive output increases, when the frequency of the drive operation reaches the upper limit, and stabilizes 10s operation, if the pipe network pressure is lower than the water pressure setting value at this time, increase the No. 2 pump. Under the logical control of PLC, the electromagnetic switch connecting the No. 1 pump motor to the drive is disconnected, the No. 1 pump motor is switched to the frequency operation, and the inverter is connected to the No. 2 pump motor, so that the No. 2 pump motor is operating in the speed control state.<br>When the water consumption is low, the water pressure increases, the frequency of the inverter output decreases, enters the pump reduction process, the pump motor speed decreases, when the frequency of the drive reaches the lower limit, and stabilizes 10s operation, if the pipe network pressure is higher than the water pressure setting, the drive control pump is stopped. If pump No. 1 is running at frequency, switch pump No. 1 from frequency to variable frequency.

When the water consumption is large, the water pressure decreases and the frequency converter output frequency increases. When the frequency converter reaches the upper limit and operates stably for 10 seconds, if the pipe network pressure is lower than the set value of water pressure, add No. 2 water pump. Under the logic control of PLC, the electromagnetic switch connecting the No.1 water pump motor and the frequency converter is disconnected, the No.1 water pump motor is switched to the power frequency operation, and the frequency converter is connected with the No.2 water pump motor to make the No.2 water pump motor work in the speed regulation state.<br>When the water consumption is small, the water pressure increases, the frequency converter output frequency decreases, and the pump motor speed decreases. When the frequency converter reaches the lower limit and runs stably for 10 seconds, if the pipe network pressure is higher than the set value of water pressure, stop the pump controlled by the frequency converter. If No.1 water pump is running at power frequency, switch No.1 pump from power frequency operation to frequency conversion operation.<br>