PLC application in paper machine drive control

PLC application in paper machine drive control in shaanxi university of science and technology in xiao tuan tan keng boon Meng Yan Beijing welcome to visit exhibition hall 1 e papermaking machinery exhibition hall pulping machine, calender, silk machine, extrusion machine, pulp, pulp washing machine. 。 。 Pick to: mainly introduces the PLC as the control unit building, design and its application in paper machine drive system, realize PLC for the inverter as the execution unit transmission system of full digital field bus control and to synchronize the speed of paper machine the transmission point chain, related transmission point of load distribution and tension control requirements. Key words: PLC; Frequency converter; Fieldbus application in paper machine drive control field, along with the frequency conversion technology, the wide application of computer technology and network communication technology, the degree of automation and control precision of the paper mill, control the speed, stability and reliability of the system to a new level. This paper mainly illustrates the production 200 PLC of Siemens corporation in the design and application of paper machine drive system. 1 system construction of programmable controller PLC controller and frequency converter DCS system is shown in figure 1. System of the transmission point start, stop, emergency stop and crawl/operation with relay control, paper machine speed increase or decrease in tight pine with PLC controller to control, at the same time completed many transmission speed chain control requirements and the load distribution point for load sharing control functions; PLC for the several kinds of signal acquisition, the motor's speed setting, the judge operates by RS again write 485 bus to the inverter frequency signal output, PLC according to the open/closed loop signals at the same time, adjust their handler to the open/closed loop control requirements. We in the PLC hardware design 2 to 14 points of the paper machine transmission are analyzed: PLC adopts Simens PLC226, due to the application using the button loop scanning way, thus the transmission point plus or minus tight pine action button control form matrix switch quantity control; And because the press section or vacuum sizing of the multipoint control of load distribution control is required, but through the PLC input module port hardware detection to judge whether meet the requirements of load distribution ( 2) ； PLC port 0 with inverter for serial communication in bus communication way. 3 PLC program design of PLC program to add and subtract tight loose button loop scanning, judge whether there is loose and subtract tight as, and perform the corresponding functions; Automatic detection to identify the transmission point is in the open/closed loop control, improve the stability of the system; Speed chain choose binary tree data structure to adapt to variable multiple branch speed chain control requirements; Communication error handling, including data error retransmission, communication timeout handling, bus fault alarm, can be automatically removed after the point of failure and the failure to eliminate automatic retransmission. Load sharing control, which requires to load distribution of transmission between the motor load rate is the same. The main process diagram as shown in figure 3. 4 speed chain structure design of the transmission point in paper machine structure order digital abstraction, this number should be consistent with the frequency converter internal address is set to. According to the binary tree structure, determine the transmission nodes of master-slave relationship, fill out the chain relationship register in the program. Specific implementation as shown in figure 4 ( In the east henan fraternity paper 5 paper machine as an example) : the transmission speed for a given frequency converter, visit location register, slave nodes in the chain relationship between register number is determined, then the node is corresponding chain relationship processing, until the chain fully processed. 5 load distribution structure of the actual working principle and program design load distribution requirements of the corresponding point of the transmission motor load rate is equal, equivalent to the torque of the motor current and its corresponding to the rated current of equal ratio. As shown in figure 4, the true pressure and pressure in the drive control of a set of load distribution, must call load distribution subroutine of master-slave drive point master-slave torque adjustment, change the adjustment coefficient, in order to change the master-slave torque, the load rate are equal. 6 conclusion PLC and fieldbus control application in paper machine drive system, effectively improve the control precision of the system, from the input to the control to realize the digital operation, solve the on-site electromagnetic interference, simplifies the system structure, improve the reliability. Also used field bus communication technology, make the speed chain and subtract more accurate quantitative loose control, to solve the problem of load distribution control are also, the scheme design in henan fraternity Orient paper, xuchang, henan, shaanxi out paper mill paper application, good effect, stable running, bring greater economic benefits. ( Barometer, offer] ( 1] Frequency conversion transmission principle and design [ M] [ 2] The $7200 programming manual [ S] . 200L [ 3] ACS600 frequency inverter user manual Is] , 2000.
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