Converter And Programmable In Paper Rewinding Machine
Water Industry Network HC : Introduction Rewinding machine is an important paper production machines, usually installed immediately behind the paper machine, the speed should be 2-3 times the speed of machine, usually 1500-1800m/min, up to 3000m/min above cited paper, it should take the highest running speed of 1:100. To ensure that the process of constantly rewinding paper and loose paper, pieces of paper to ensure constant tension; finished paper to ensure quality within the tight loose outside, must end before and after the roll motor load distribution control, and pressure roller for pressure control. Therefore, the rewinding machine Electric The main performance requirements for transmission speed is the long-term stability, adjustable speed and wide speed range, fast response characteristics.
Conventional rewinder control to the main DC drive, DC digital control system. As the DC motor commutator and brush of the reasons, in stable conditions, the design speed rewinding machine can only reach 1800m/min, digital regulator accuracy is still limited to a maximum speed of about 0.08%, can not meet the high-speed paper Machine matching requirements. As the production process and the speed rewinder constant improvement of the production process of the rewinding machine for real-time control and monitoring requirements are also increasing. In order to reduce the production site and the rewinder lot of wiring between the control room to improve signal transmission speed and quality to PLC for the control unit, Inverter For the implementation of the unit, OP operator panel for the operating unit composed of all-digital field bus control system for AC drive Rewinder Rewinder exchange reform has become an effective way.
1. Control system components and Hardware Configuration
Rewinder drive system can be divided into two parts, one is a take-up part, the other is part of unwinding. Unwinding Unwinding some units have a motor, take-up part of the take-up motor, 2 sets, both groups rely on web tension motor together, as shown in Figure 1, specifically, motor function of unwinding is to provide an anti- to the moment, in the process of unwinding tension of paper. Some see it as a whole take-up, the take-up motor to overcome the unwinding direction of the motor to provide torque leveled the site and take-up roll of paper.
Process requirements under the rewinder, using Profibus-DP bus shown in Figure 1 composed of three control rewinder system structure. System control with PLC as the core, 3 6SE70 Converter and HMI OP hanging in the Profibus-DP bus. Profibus-DP field bus is mainly used for site-level high-speed data transmission, to solve automatic control systems (such as PC, PLC, etc.) through high-speed serial bus with distributed field devices (such as remote I / O, frequency converter, Solenoid valve Etc.) communication between the tasks. The first stage inverter drive system to complete before the end of the main roller to achieve load distribution control motor control motor torque by setting the two curves run on the unwinding motor closed-loop control to achieve constant tension composite; drive the second stage for the PLC control system, mainly to complete pressure roller pressure area pressure control and operational control of the rewinding machine. Transmission system for the upper third level optimal control system, using OP270 as the host computer is used to drive the point rewinder operation and Monitor .
System uses the master-slave structure, PLC and OP270 operator panel-based station, inverter, ET200M from the station. Standing from the main bus station to send data to obtain data from the station, only when the main station from the station to issue a request to the main station and the exchange of data. DP slave address must be set to distinguish between the various slave. Scene Sensor Signal and various control signals received near the remote ET200M, and through the bus and Profibus-DP Controller PLC to exchange information; back rolls, front and rear end of roller motor vector frequency inverter with Siemens, the motor through the inverter to achieve real-time control. Scattered-site equipment to Profibus-DP bus connection into a form of information can communicate with each other, the common task to complete the network control system, formed under complete control the entire distribution network to the site a new integrated control system.
To meet certain cost-effective, system configuration, on the use of such solutions:
(1) PLC selected high-performance SIMATICSS7-300, CPU for the 315-2DP, with two Profibus-DP field bus interface. It is the control system of a class of primary stations, main bus communication control and management to complete.
(2) OP270 operator panel as the second category the main points of the system to complete the site to read and write data and fault diagnosis. It is a high performance LCD color control panel, through the RS485 port and Profibus-DP bus connected to scrape all Chinese workers to do the interface to facilitate the operation.
(3) distributed I/OET-200M, it is a modular Profibus-DPI / O from the station, through the IM153 Interface template to connect Profibus-DP, is responsible for signal acquisition and output. According rewinder control requirements, remote I / O must be configured to three DI template, 3 DO module, two AI blocks and two AO modules. The addressing modes, like any SIMATICS7-300CPU centrally or expansion unit in the I / O, addressing the same manner as the I / O template can be directly addressed with instructions to access or process image.
(4) 3 inverters are chosen Siemens 6SE70 vector frequency (speed digital communication devices), through CBP2 (Profibus communication board) as the access from the station on the Profibus-DP fieldbus. 6SE70 vector control inverter, can improve the dynamic response capability of rewinding machine, to overcome the acceleration and deceleration of the velocity fluctuation caused by the change, to ensure constant tension rewinding device and speed stability. 6SE70 converter free function blocks and BICO technology, flexible configuration designed to complete the complex process control requirements.
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