I. Introduction:
In many of today's paper machine control systems, in order to simplify the mechanical structure and reduce the maintenance cost of the equipment, it is required to synchronously control the speed of multiple motors of the equipment. Using Haiwell's powerful, easy-to-use communication functions for domestic PLCs, synchronization of multiple motors can be easily achieved. Here's an introduction to this application.
Second, the solution:
The system consists of a touch screen, a programmable controller (Haiwell PLC), and an inverter.
Working principle: The main speed required by the paper machine production is set by the touch screen to the PLC, and then the speed of each roller is calculated according to the relationship between the speed of each roller and the main speed and sent to each inverter through the high-speed convenient communication command of Haiwell PLC. .
System advantages:
1. Using the high-speed and convenient RS485 communication of Haiwell PLC simplifies the wiring of the system and avoids the logic control function of the synchronous controller in the traditional control. The analog control between the synchronous controller and the frequency converter is easy to be interfered with.
2, Haiwell PLC standard configuration 2 communication ports, 1 RS232 port, 1 RS485 port, any one port can be used as a master station or slave station. In this application, RS232 port is used to communicate with touch screen, and RS485 port is used to communicate with inverter.
3, Haiwell PLC communication speed up to 57600Kbps, speed adjustment synchronization control.
The main hardware configuration:
1. Programmable controller: HW-S32ZS220R (Haiwell PLC)
2. Inverter: VFD075B43A
3, touch screen: DOP-A57GSTD
Third, program design highlights:
1, Haiwell PLC has floating-point arithmetic instructions, the most important point is that the decimal point can be directly input in the program, which greatly facilitates the programming and debugging of the program.
2. Haiwell PLC has Modbus communication instruction, HaiwellBUS communication instruction and free protocol communication instruction, which can be conveniently connected with various inverters. In this application, use Modbus commands to communicate with each inverter;
3. All Haiwell PLC communication instructions are easy to program, no need to program special bits or special registers, or need to consider the communication sequence among multiple communication instructions. Multiple communication instructions can be executed under the same logic condition.
4. Two buttons can be placed at the position of each roller. On the basis of following the main speed, the speed can be fine-tuned and controlled according to actual requirements.
Fourth, summary:
Using domestic Haiwell PLC's convenient communication functions and convenient and easy-to-use floating-point arithmetic functions, the speed synchronization control of the equipment can be realized quickly and accurately. Can be widely used in paper machine equipment control, long conveyor chain, long conveyor line and other requirements of multiple motor speed synchronous control of the occasion.
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