Operation Manual for the Control Cabinet of the Feeding System in the Solid Waste Treatment Station

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I. Introduction This operation manual aims to guide operators to correctly use and maintain the control cabinet of the feeding system in the solid waste treatment station, ensuring the safe, stable and efficient operation of the feeding system.

## II. Overview of the Control Cabinet This control cabinet adopts advanced Programmable Logic Controller (PLC) technology combined with Human-Machine Interface (HMI) to realize centralized control and monitoring of equipment such as belt conveyors, screw conveyors and feeders in the feeding system.

## III. Operation Panel and Interface 1. **Appearance of the Control Cabinet** - The cabinet body is made of [description of material and protection level]. There is an operation door on the front, and on the door, there are installed Human-Machine Interface (touch screen) and emergency stop buttons, etc.

2. **Human-Machine Interface (HMI)** - Main screen display: - Indicator lights for the running status of each equipment in the system, such as "Belt conveyor running", "Screw conveyor stopped", etc., which intuitively display the working conditions of the equipment in different colors.

- Display of real-time material flow data, with the unit of [specific flow unit]. - Display of material level height data, showing the material level of each silo in the form of percentage or actual height value.

- Equipment control interface: - Start/stop buttons for each equipment. After clicking the "Start" button and confirming, the corresponding equipment can be started. During the equipment startup process, there will be status prompts, such as "Starting...". After the startup is completed, it will display "Running". Clicking the "Stop" button can stop the equipment operation, and there will also be corresponding prompts during the stopping process.

- Equipment speed adjustment function area. Through the sliding bar or digital input box, the running speed of equipment such as belt conveyors and screw conveyors can be set. The speed setting range is from [minimum speed value] to [maximum speed value]. After the setting is completed, click the "Confirm" button to make the speed take effect.

- Parameter setting interface: - Various alarm thresholds can be set, such as the motor overload current threshold, belt deviation angle threshold, etc. After inputting reasonable values, click the "Save" button to complete the setting. - Time setting, including the setting of the starting time for equipment running time statistics, the setting of the time interval for data recording, etc.

- Alarm information interface: - When a system failure occurs, this interface will automatically pop up and display detailed alarm information, such as "Motor overload of belt conveyor, fault code [specific code]", accompanied by audible and visual alarm signals (the alarm volume and light color can be set in the control cabinet). Operators can view the alarm history record on this interface and perform the alarm reset operation (after the fault is eliminated).

IV. Equipment Control Operations 1. **Preparations before Startup** - Check whether the power supply of the control cabinet is connected normally and whether the voltage is stable within the rated value range.

- Check whether the connection parts of each equipment are firm and whether there are any foreign objects blocking the equipment operation.

- Observe whether the data of each sensor on the Human-Machine Interface is normal and whether the material level is within the allowable startup range.

2. **Equipment Startup Sequence** - First, start the feeder. Click the "Start" button of the feeder on the Human-Machine Interface and wait for the feeder to run stably (which can be judged according to the sound and material flow situation).

- Start the screw conveyor. The operation method is the same as above. Pay attention to observing the conveying situation of materials in the screw conveyor. If there is any abnormality, stop it immediately. - Finally, start the belt conveyor. After starting, check whether the belt deviates and whether the materials are evenly distributed on the belt.

3. **Equipment Stop Sequence** - First, stop the belt conveyor. After clicking the "Stop" button, wait for the materials on the belt to be conveyed completely. - Stop the screw conveyor. After the materials inside it are emptied, stop its operation. - Stop the feeder to complete the stop operation of the entire feeding system.

4. **Equipment Speed Adjustment Operations** - According to the feeding requirements, enter the equipment speed adjustment function area on the Human-Machine Interface during the equipment operation process. - For the belt conveyor, slowly adjust its speed setting value. Each adjustment amplitude should not be too large. After the adjustment, observe the material conveying situation and the equipment running status to ensure a smooth speed adjustment.

- The speed adjustment operations of the screw conveyor and the feeder are similar. Pay attention to matching the material flow among various equipment during the speed adjustment process to avoid material blockage or overflow.

## V. Fault Handling and Alarm

1. **Common Faults and Handling Methods**

- **Motor Overload**: - Reasons: It may be caused by excessive equipment load, motor failure or jamming of transmission parts. - Handling: Immediately stop the operation of relevant equipment, check whether the materials block the equipment and whether the transmission parts are flexible. If the motor is overheated, wait for the motor to cool down and then check the insulation condition of the motor winding. Replace the motor if necessary. After eliminating the fault, perform the alarm reset operation on the alarm information interface of the Human-Machine Interface and then restart the equipment.

- **Belt Deviation**: - Reasons: Incorrect installation of the belt, uneven wear of idlers or uneven distribution of materials.

- Handling: First, stop the operation of the belt conveyor, adjust the belt tensioning device to make the belt return to its normal position. Check the condition of the idlers and replace the severely worn idlers. At the same time, adjust the feeding position of the feeder to make the materials evenly distributed on the belt. After handling, reset the alarm and restart the equipment.

- **Equipment Blockage**: - Reasons: High humidity or high viscosity of materials or mismatch of equipment running speeds. - Handling: Stop the relevant equipment and clean up the blocked materials. For materials with high humidity, measures such as drying or adding loosening agents can be taken. Adjust the equipment running speed to ensure smooth material conveying. Then reset the alarm and restart.

2. **Alarm Reset Operation** - After the fault is eliminated, find the "Alarm Reset" button on the alarm information interface of the Human-Machine Interface and click this button to perform the alarm reset operation. The reset can only be carried out after the fault is truly eliminated, otherwise it may cause the equipment to fail again or be damaged.

## VI. Data Recording and Query

1. **Contents of Data Recording** - Record the running time of equipment, accurate to hours, minutes and seconds, recording the startup and stop times of each equipment. - Record the material flow data, recording the flow value of materials at set time intervals (such as every minute). - Record the material level data, recording the change of the material level of each silo over time.

2. **Data Query Methods** - Enter the data query interface on the Human-Machine Interface. You can choose the time range for query (such as query by day, week, month). - Select the type of data to be queried (equipment running time, material flow, material level data, etc.), and click the "Query" button. The system will display the query results in the form of corresponding data curves or tables. The query results can be exported to external storage devices (such as USB flash drives) for backup or further analysis.

## VII. Maintenance and Servicing

1. **Daily Maintenance**

- Regularly clean the dust on the surface of the control cabinet to prevent dust from entering the inside of the control cabinet and affecting the normal operation of electrical components. - Check whether the connections of electrical components in the control cabinet are loose. If so, tighten them in time.

- Observe whether the display of the Human-Machine Interface is normal and whether the touch screen is sensitive. If there is any abnormality, handle it in time or contact technical personnel.

2. **Regular Servicing** - Every [specific time period], conduct a comprehensive inspection of the electrical components in the control cabinet, including the wear condition of the contacts of circuit breakers, contactors, relays, etc. Replace the severely worn components in time.

- Check the running status of the PLC and HMI, backup their internal programs to prevent program loss. Meanwhile, optimize and upgrade the programs according to the actual running situation.

- Calibrate the sensors to ensure the accuracy of their measurement data. Check whether the installation positions of the sensors have changed. If so, adjust them in time. - Check whether the grounding system of the control cabinet is reliable and whether the grounding resistance meets the requirements. If there are problems, repair them in time.

VIII. Precautions

1. Operators should receive professional training and be familiar with the contents of this operation manual before operating.

2. During the equipment operation process, it is strictly prohibited to open the control cabinet door for operation or maintenance. If maintenance is required, relevant equipment must be stopped first and the power supply must be cut off.

3. It is strictly prohibited to place flammable and explosive items around the control cabinet. Keep the environment around the control cabinet clean and dry.

4. In case of faults or abnormal situations that cannot be handled, immediately stop the equipment operation and contact professional technical personnel for maintenance. Do not disassemble or change the equipment and circuits in the control cabinet without authorization. The control cabinet of the feeding system in the solid waste treatment station is the core control unit of the entire feeding system. The following is a detailed introduction:

### Function Overview - **Equipment Control**: Realize centralized control of various equipment in the feeding system, such as belt conveyors, screw conveyors and feeders, etc., and can remotely or locally control the running status of equipment, such as startup, shutdown, speed adjustment, forward and reverse rotation, etc.

- **Material Conveying Monitoring**: Real-time monitor the conveying situation of materials, including parameters such as material flow, conveying speed and material level height, to ensure that materials can be stably and continuously conveyed to the treatment equipment.

- **Fault Alarm and Protection**: Real-time monitor and alarm the equipment failures in the feeding system, such as motor overload, belt deviation, equipment blockage, etc., and at the same time have corresponding protection functions to avoid equipment damage caused by failures.

- **Data Acquisition and Recording**: Acquire and record the running data of the feeding system, such as equipment running time, energy consumption, material processing volume, etc., to provide data support for production management and equipment maintenance.

### Hardware Composition

- **Cabinet Structure**: Usually adopt standard cabinet structures such as GGD, GCS or MNS, which have good protection performance and universality. The outer shell of the cabinet is generally made of cold-rolled steel plate, and the surface is treated by electrostatic spraying, which has the characteristics of anti-corrosion, anti-rust and beauty.

- **Controller**: The core component is the Programmable Logic Controller (PLC), which can automate the control of the feeding system according to the preset program logic. In addition, it may also be equipped with a Human-Machine Interface (HMI), such as a touch screen, to facilitate operators to set parameters, monitor equipment and operate.

- **Electrical Components**: It includes circuit breakers, contactors, relays, fuses, thermal relays, current transformers, voltage transformers, etc., which are used to realize functions such as circuit on-off, protection and signal conversion.

- **Sensors**: Install multiple sensors, such as material level sensors, flow sensors, speed sensors, deviation sensors, etc., which are used to monitor the status of materials and equipment in real time. - **Power Supply System**: It includes incoming power switches, power filters, UPS uninterruptible power supplies, etc., to provide stable and reliable power supply for the electrical components and equipment in the control cabinet.

### Software Design - **Control Program**: Write a control program based on the PLC to realize the automated control logic of the feeding system. The program design should fully consider the technological process and equipment characteristics of the feeding system to ensure the stable operation and efficient control of the system.

- **Monitoring Interface**: The HMI monitoring interface should be intuitive and friendly to facilitate operators to operate and monitor. The interface should display the running status of equipment, parameter settings, alarm information and other contents, and at the same time have operation buttons and menus to realize remote control of equipment.

- **Data Processing and Storage**: Process and analyze the collected data, such as calculating the material processing volume and equipment energy consumption, and store the data in a database for subsequent query and statistical analysis.

### Installation and Debugging

- **Installation Requirements**: The control cabinet should be installed in an indoor environment that is dry, well-ventilated and free of vibration. The installation position should be convenient for operators to operate and maintain. During installation, ensure that the cabinet body is firmly installed, well-grounded and the electrical connection is reliable.

- **Debugging Steps**: First, conduct hardware debugging, check whether the installation of electrical components is correct, whether the line connection is firm and whether the power supply is normal. Then conduct software debugging, download the written control program to the PLC, conduct function tests and parameter adjustments to ensure that all functions of the system are normal.

### Maintenance and Servicing - **Daily Maintenance**: Regularly check the appearance of the control cabinet, clean the dust and debris on the surface of the cabinet body. Check whether the connections of electrical components are loose and whether there are abnormal phenomena such as overheating and strange smell. Check the working status of sensors to ensure accurate measurement.

- **Regular Servicing**: Conduct a comprehensive servicing of the control cabinet at regular intervals, including replacing aging electrical components, cleaning the internal dust of the PLC and HMI, checking the reliability of the grounding system, etc. At the same time, backup and optimize the control program to ensure the stability and reliability of the system.