PLC Control Cabinet for Pumps in Wankong Sewage Treatment Plant

YouTube：https://youtube.com/shorts/pXmdtn2wi4s

### Functions
- **Pump Control**: It can automatically control the start and stop of pumps according to preset programs. For example, the start and stop of pumps are determined based on the liquid level in the sewage tank. When the liquid level reaches the set high value, the pump is started to drain water, and when the liquid level drops to the low value, the pump is stopped to prevent the pump from being damaged due to idling.
- **Protection Functions**: It has overload, short-circuit, and phase-loss protection, etc. When faults such as overload current, short circuit in the circuit, or phase-loss operation occur in the pump motor, the power supply can be quickly cut off to protect the safety of the equipment.
- **Data Acquisition and Transmission**: It collects the operation status data of pumps, such as operating current, voltage, temperature, and rotational speed, and transmits the data to the monitoring center or the host computer system so that the staff can grasp the operation status of the pumps in real time.
- **Remote Monitoring and Operation**: It supports the remote monitoring function. Staff can view the operation parameters and status of pumps at any time and anywhere through remote terminal devices, such as computers and mobile phones, and can also conduct remote operations to control the start and stop of pumps.
- **Energy Saving and Optimization**: Through the analysis and processing of the operation data of pumps, energy-saving control is achieved. For example, the rotational speed or the number of running pumps can be automatically adjusted according to the requirements of sewage flow and pressure to reduce energy consumption.

### Structural Composition
- **Cabinet Body**: It is usually made of high-quality cold-rolled steel plates, featuring solidity, durability, and good protection performance. The protection level generally reaches IP41 or IP20 and above, which can effectively prevent dust, water, and foreign objects from entering.
- **Power Supply Part**: It includes a main air switch used to control the power supply of the entire cabinet. It may also be equipped with a 24V DC switching power supply to provide a stable DC power supply for the PLC and related control circuits.
- **PLC Controller**: As the core component, an appropriate PLC model is selected according to the project scale and control requirements. For small projects, an integrated PLC can be used, while for large projects, modular or card-based PLCs may be selected, and a redundant system may be set up to improve reliability.
- **Relay**: It is used for signal conversion and isolation. When the signal type or voltage level of the PLC output signal is inconsistent with that required by the control circuit, the relay is used for transfer to ensure the correct transmission and execution of the control signal.
- **Terminal Block**: It is used to connect the wires and cables between the PLC and external devices, facilitating the connection and maintenance of circuits and ensuring the reliability of electrical connections.

### Advantages
- **Improve the Degree of Automation**: It reduces human intervention, realizes the automatic start and stop, switching, and monitoring of pumps, reduces labor intensity, and improves the efficiency and stability of sewage treatment.
- **Enhance Reliability**: The PLC control cabinet has high reliability and anti-interference ability, and can operate stably in harsh industrial environments, reducing equipment failures and downtime.
- **Flexible and Expandable**: It can conveniently expand functions and modify programs according to the development and process changes of the sewage treatment plant to meet different control requirements.
- **Precise Control**: It can accurately control the operation parameters of pumps, such as rotational speed and flow, realizing refined management of the sewage treatment process, and improving the treatment effect and the rate of meeting the water quality standards.