Abstract
The design of the main control for dryer design process. When the dryer to work, dry air, renewable fans, conveyor motor, heater, heater renewable at the same time to start, when the sensors detect no feed hopper dryer, then start the transmission fan, PET dryer by inhalation, the beginning of drying, PET after one time after drying and regeneration of dry molding machine into the hopper.
The article focuses on the dryer system in accordance with the composition and working methods of hardware design of programmable controller hardware and software control method, also described in detail the software implementation of the programmable controller program, design programs and systems control process of the logic function. Programmable logic controller system to control the process, including drying fans, renewable fans, conveyors, etc. fan start or stop and their heaters, heater regeneration process chain; when the drying air temperature is higher than 165 ℃, fan overload , lack of material failure of the emergency system control and timely chain of sound and light alarm.
