Low speed paper machine main drive electronic control system
Process requirements
1. The paper machine consists of a headbox, a wire section, a press section, a drying section, a calendering, and a roll paper. The main drive electric control system is a speed chain coordinated system composed of a plurality of transmission points.
2. To maintain a constant transmission ratio between transmission points, keep the line speeds at each transmission point consistent. It is easy to increase the speed and deceleration of the equipment, and to avoid paper breaks or piles of paper due to the large difference in line speed between the transmission points.
3. The low-speed paper machine requires a control accuracy of 0.1% for the speed control of the drive system, and usually requires a frequency control accuracy of 0.01HZ.
4. Analog signals are susceptible to electromagnetic interference, affecting the paper machine's drive accuracy and stability. In order to improve the accuracy and stability of the system and enhance the anti-interference ability, the system adopts PLC as the main control unit. Acceleration and deceleration of all levels are controlled by buttons; the acceleration and deceleration of each transmission point in the speed chain and the speed ratio are all controlled by the PLC. Calculate and control, through RS485 communication, use the data way to send the speed adjustment instruction to the frequency converter.
Paper machine
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System Configuration
SINE303 series of open-loop vector control inverter, N Taiwan, with high transmission accuracy, dynamic performance, and fast response.
System main control unit: Mitsubishi FX2N series PLC with 485 communication module and D/A module.
Each transmission point of the system is controlled according to the speed open-loop control mode, and a speed control command is issued by the PLC.
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System Features
1. The electronic control system adopts an open-loop control method, which has a simple structure, a clear relationship between control logic, safe and reliable use, and convenient operation and maintenance.
2. Current vector control inverter, flexible speed control, fast response, high efficiency and good dynamic performance.
3. Frequency control frequency accuracy of 0.01HZ, the system speed accuracy, and no drift, zero error.
4. PLC control is used to accurately calculate the speed and transmission ratios at all levels. The coordination accuracy between the speeds of the transmission points is high, and no paper break or stacking occurs.
5. The communication mode realizes all-digital control of the system, strong anti-interference ability, and no signal attenuation.
6. The operation process automatically stores the current level of speed. When the system is stopped or stopped after a power failure, the system runs at the speed before the stop. There is no need to re-adjust the setting speed of each level of the inverter.
1. The paper machine consists of a headbox, a wire section, a press section, a drying section, a calendering, and a roll paper. The main drive electric control system is a speed chain coordinated system composed of a plurality of transmission points.
2. To maintain a constant transmission ratio between transmission points, keep the line speeds at each transmission point consistent. It is easy to increase the speed and deceleration of the equipment, and to avoid paper breaks or piles of paper due to the large difference in line speed between the transmission points.
3. The low-speed paper machine requires a control accuracy of 0.1% for the speed control of the drive system, and usually requires a frequency control accuracy of 0.01HZ.
4. Analog signals are susceptible to electromagnetic interference, affecting the paper machine's drive accuracy and stability. In order to improve the accuracy and stability of the system and enhance the anti-interference ability, the system adopts PLC as the main control unit. Acceleration and deceleration of all levels are controlled by buttons; the acceleration and deceleration of each transmission point in the speed chain and the speed ratio are all controlled by the PLC. Calculate and control, through RS485 communication, use the data way to send the speed adjustment instruction to the frequency converter.
Paper machine
System Configuration
SINE303 series of open-loop vector control inverter, N Taiwan, with high transmission accuracy, dynamic performance, and fast response.
System main control unit: Mitsubishi FX2N series PLC with 485 communication module and D/A module.
Each transmission point of the system is controlled according to the speed open-loop control mode, and a speed control command is issued by the PLC.
System Features
1. The electronic control system adopts an open-loop control method, which has a simple structure, a clear relationship between control logic, safe and reliable use, and convenient operation and maintenance.
2. Current vector control inverter, flexible speed control, fast response, high efficiency and good dynamic performance.
3. Frequency control frequency accuracy of 0.01HZ, the system speed accuracy, and no drift, zero error.
4. PLC control is used to accurately calculate the speed and transmission ratios at all levels. The coordination accuracy between the speeds of the transmission points is high, and no paper break or stacking occurs.
5. The communication mode realizes all-digital control of the system, strong anti-interference ability, and no signal attenuation.
6. The operation process automatically stores the current level of speed. When the system is stopped or stopped after a power failure, the system runs at the speed before the stop. There is no need to re-adjust the setting speed of each level of the inverter.