Based on PLC and PROFIBUS - DP bus analysis - sheet machine control systems Industrial control -

A: technological requirements

sheet machine for plastic raw materials such as PE, PET, PVC or starch based biodegradable material is heated, a technology of extrusion, plastic molding. After the forming of sheet for positive pressure and negative pressure vacuum forming products.

for the plate rolling, due to subsequent products demand, uniform thickness of sheet forming and asked, good surface finish, no stripes. Therefore, this machine has the following technical requirements:

screw die head pressure under the condition of a kind of process, must be consistent; For screw extrusion the speed of the motor must have good precision and constant torque characteristics ( Low frequency high torque) ;

after the plasticizing material into the processing process, rolling, roll, finalize the design, three roll has a good synchronization speed response and high precision;

for high-speed aircraft ( 40 m/min speed) As winding system is using artificial way and had to use storage rack; System is in normal production, storage rack in the same position, set up and down roller in volume, storage rack automatic rise, change after the success of the volume, restart in volume and the group on the roller to horizontal position quickly, and makes the pinch and three roll keep synchronous speed;

after winding process to automatically forming material harvest must the diameter of the material, for the use of next working procedure;

2: based on inovance vector inverter and PROFIBUS DP high speed bus and plan;

A: based on the ac full closed-loop vector pulse synchronization transmission system

screw closed-loop vector control technology:

closed-loop vector to ensure that the screw low frequency high torque, high precision speed stability, ensure the die head pressure is consistent, uniform thickness;

pulse synchronization technology ( Three roll synchronization) :

closed-loop vector pulse synchronization technology, overcome the analog signal of linear error and temperature drift error, error of voltage fluctuation, ensure the quality of sheet forming;

synchronous pulse synchronous PID compensation ( Pinch) :

the loading device of automatic control by pinch motor PID adjustment, so that when change the volume by external forces open storage rack store material, change the volume level is completed before the automatic tracking speed, quickly reach equilibrium position, ensure the consistency of the material tension.

special inverter control by MD330 tension winding:

with the method of general motor with encoder, by adjusting the parameters can easily complete the tension automatic control, entirely with PLC controller control, overcomes the drawback of torque motor easy fever ( Large diameter especially) And to reduce the cost of control system and complicated PLC controller operation;

B:现场总线- DP bus network structure schematic

system USES a PROFIBUS - at a high speed DP international standard bus.

PLC control system to complete three roller speed ratio coefficient, winding tension set, display, etc. ; And is responsible for the data through PROFIBUS - DP bus input to the converter;

PLC to complete logic control of the machine fault handling, data, records, etc. ;

inverter to complete all the tension closed-loop control, automatic balance the position of the floating roller, the strict control of three roller synchronous linear velocity;

PLC through PROFIBUS - DP bus and the inverter can exchange data, even if the inverter parameter was disorderly, still can be a key repair method to complete all the user parameter Settings, minimize the maintenance cost.

all the PLC controller to inverter attachment, no longer need complex I/O wiring, you just need to a proper length of the network cable to complete all the work;

with PROFIBUS - general DP bus technology, make the distribution of all the machines in the workshop of interconnected control center, create conditions for management automation.
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