What are the experimental or internship conditions required for PLC high and low pressure towerless

1. Design tasks and requirements.

1.Use a reed meter water level controller to measure the water level of the water tower.

2.The water supply pump motor stops at high water level and runs at low water level.

3.There is a high and low water level pump start and stop signal display.

4.There is short-circuit and overload protection.

5.PLC control program.

Second, the role and purpose of design.

Design and install a control circuit for the power pump motor that controls the water tower to keep the water level of the water tower within the specified range. It can be automatically controlled within the specified water level and can be automatically controlled by PLC.

3. Design process.

1.System Overview.

The main circuit is designed for three-phase 380 volt national standard power supply, the motor working voltage is 380 volts, the main control circuit is two-phase 380 volt power supply, and the signal light control circuit is single-phase 220 volt power supply.

The basic control requirements for the motor are as follows:

1) Since it is a single motor starting circuit, direct start is adopted.

2) The motor adopts overload protection.

3) In order to avoid the misoperation caused by the bad reed switch and affect the water supply, the control circuit can be manually forcibly started and manually stopped.

4) Since the voltage used in the main control circuit and the signal light control circuit is different, two reed switches are used for control.

5) The signal light is displayed with color, which makes it clear at a glance. Through the display of high and low water level signal lights, and comparing with the actual operating status of the motor, it can be seen that the quality of the reed switch in the main control loop is good or bad (if the PLC system is used, it does not have the function of judging the quality of the reed switch).

6) If the PLC system is used, only the SL3-SL4 reed switch is used, and the system has a strong start function and a stop function at any time.

2.Electrical control principle design.

1) Main circuit design.

Close the switch QK1, the main control circuit (at this time to ensure that the knob switch SA1 is in the normally open state) and the signal light control circuit is energized.

2) Control circuit design.

Under normal circumstances, the knob switch SA2 is normally open, close SA1 to the normally closed position, the contactor is energized or not, depending on the state of SL1 and SL2 of the reed transistor, when it is in SL1 low water level, the contactor is energized, and when it is in SL2 high water level, the contactor is not electrified.

3) Calculation of main parameters.

3.PLC control circuit design.

Draw the schematic diagram of the PLC control circuit and compile the function table of the IO interface.

The tower-free water supply equipment is the pump starts, and the water is injected into the tank through the check valve, so that the pressure in the tank increases, and when the pressure reaches the upper limit of the set pressure, the automatic pressure controller automatically closes the pump and stops the pump. Because the pressure in the water supply tank is higher than the pressure of the water supply network, it can automatically reduce the pressure of water supply, when the pressure is reduced to the lower limit of the set pressure, the automatic control pump starts, and automatically injects water into the water supply tank, so that the equipment does not stop supplying water and runs automatically.

Longpai (Henan) Plumbing and Environmental Protection produces towerless water supply, frequency conversion water supply, fire water supply, etc. Longpai's towerless water supply is sold all over the country, delivered nationwide, and installed door-to-door guidance nationwide.

Hello, the problem you said is that the pump can be controlled by PLC to control the water pump to carry out the constant pressure water supply of the pipe network. Specifically, the pressure sensor is used to transmit the pressure of the pipe network to the PLC, and then the inverter is controlled, and then the inverter is used to control the water pump.

The constant pressure should be good, and the PID automatic control can be realized, and the pressure sensor and analog input module are installed to adjust the speed of the motor through the deviation of the analog value, so the water supply pressure can be constant.

The sophistication of constant voltage is at least technically so.

It's okay to have constant pressure, but if you do it, it doesn't seem to be too complicated.

The MCGS configuration software controls the input and output of the PLC.

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Zhengzhou Tianhai tower-free water supply equipment has flexible control of segmented water supply, regular water supply, and manual selection of working mode.