Agricultural Irrigation System by Coolmay PLC HMI all in one

Release date:2020-08-13


1.    PLC controller: Coolmay CX3G-34MT-12AD8DA-A0-A0-485/485

2.    Main components: 10 solenoid valves, 2 inverters, 2 motors, 4 proportional valves, 2 pressure sensors, 4 liquid level sensors

3.    Other components

Solenoid valve control

This system uses 10 solenoid valves, which can be controlled manually or automatically.

l  Automatic control

The process includes 10 steps. You can specify how many steps to use, and you can specify the solenoid valve and power-on time of each step. After pressing the automatic-start button, the process will start from the first step of the process to the last step.

l  Manual control

Manual control mode can directly control the switch of the solenoid valve, and can also monitor the switch state of the solenoid valve from the HMI, and easily monitor the status of each solenoid.

Water pump control

    Manual and automatic control.

    After the automatic opening, it has been maintained at a set pressure. If one or more valves are opened and the pipeline pressure is reduced, the system will automatically increase the operating frequency of the inverter, and the motor will accelerate to maintain the pipeline pressure at the set pressure. This keeps the pressure in a constant range and keeps the pressure at the outlet of each pipe constant.

The water pump is running. When the valve is closed, the pressure in the pipeline will rise to the set point, and it will stop. When the pressure is lower than the pipeline pressure, the system will automatically adjust the pressure to maintain the pressure at the set value. When the pipeline pressure exceeds the alarm set value, it will prompt a high pressure alarm. When the pipeline pressure is lower than the low-pressure alarm set value, it will prompt a low pressure alarm and stop the motor to protect the motor. When the motor is running at low frequency for a long time, after the motor reaches the low-frequency stop time, the inverter automatically stops running to protect the motor.

Fertilization control

The fertilization control part is composed of 4 proportional valves, a water pump, and 4 level gauges. During fertilization, the fertilizer is placed in a container for dissolution, four pipes are put into the container, and the four fertilizer levels are set on the HMI Proportion, the controller adjusts the opening of the proportional valve through calculation, and controls the four fertilizers to be mixed in proportion. During the fertilization control process, the pressure of the pipeline also needs to be controlled within the set range. After opening, the system is set and calculated. The fertilization pressure is maintained in a constant pressure range through PID adjustment, and the pressure of the fertilization pipeline needs to be higher than the pressure of the water pump pipeline, so as to ensure the normal delivery of fertilizer.

Fertilization is turned on and off by a manual switch. When the pressure exceeds the set pressure alarm setting, the system starts to alarm. When the level of the fertilizer bucket is too low, the system alarms to remind the staff to feed or pay attention to the operation of the system. If the liquid level and the pumping pressure are too low for a long time, the system automatically stops the operation of the pumping motor, and issued an alarm.

PID control

l  Constant pressure water supply.

When opening different numbers of solenoid valves, it is necessary to keep the water pressure constant to avoid the increase in the water output and the decrease in the water pressure, and the irrigation is not within the set irrigation range, so the inverter must be changed through the PID adjustment calculation. The operating frequency of the water pump can be changed to change the operating speed of the pump motor to maintain the water supply pressure within a constant range.

l  Constant pressure fertilizer supply.

When conveying fertilizer, the pressure of the fertilizer pipeline must be greater than the pressure of the water supply pipeline. Through the parameter setting adjustment of PID, the pressure of the fertilizer pipeline is controlled within a constant set value range to maintain the normal operation of fertilizer.