Ted the PC series PLC application in reflow soldering equipment

Ted the PC series PLC application in reflow soldering equipment shenzhen ted Mr Electric co. , LTD. Welcome to visit e hall exhibition hall 3 PLC controller PLC programmable controller, PLC programming cable. 。 。 Combining with the system structure diagram illustrates the composition and characteristics of the system. PLC controller temperature control module has 16 temperature measurement accuracy, and built-in PID self-tuning function, the static error can be controlled at zero temperature. Less than 5 ℃. Reflow welding is surface-mount technology ( SMT) The merits of the characteristic of the important process, welding quality not only affects the normal production, also affect the final product quality and reliability. PC series PLC because of its superiority in solution, are more and more application in the industry of reflow soldering. Reflow soldering generally has a temperature range of 8 to 20, the top and bottom every temperature zone separately one thermocouple temperature measurement and 1 road heating tube heating. In general, these zones can be divided into the following four basic temperature area: 1) Preheating zone, also called slope area, is used to set the temperature of the PCB from ambient temperature to the activity of required temperature. Furnace preheating zone of 15 to 25% of the entire heating zone length. Time period of temperature control must be responsive, not overshoot at the same time, otherwise easy to damage the electronic components; 2) Heat preservation period of the main purpose is to make the temperature of each element in the SMA tends to be stable, try to reduce the temperature difference. In this area to give enough time to make the temperature of the larger components to catch up with smaller components, and ensure the solder paste in the flux fully evaporate. Control the temperature static error to zero. Less than 5 ℃. 3) Backflow area, sometimes called peak area or the heating area, the area function is to increase the temperature of the PCB from the active temperature to the recommended peak temperature. Always lower than the alloy melting point temperature, activated temperature, and the peak temperature is always on the melting point. Backflow zone problem is too high, if the peak time is too long, will the PCB too much curled up, take off a layer or damage, and damage the integrity of the component. 4) Lead in solder paste cooling section of the tin powder is melted, and fully wetting is attached on the surface, should be fast as possible for cooling, so that would help to get the bright spot and have good appearance and low contact angles. Slow cooling leads to circuit board more decomposition into the tin, resulting in a grey coarse of solder joints. PC series PLC in the reflow soldering equipment: PC series PLC built-in programming port and 485 communication port. Its programming with industrial control communication, the realization of data monitoring and Settings; 485 communication with inverter modbus protocol communication, form the modbus commands, without having to write complex communication procedures, using very easy and convenient. PC series temperature control module not only has 16 temperature measurement accuracy, and built-in PID self-tuning function of PID parameter adjustment need write lengthy process. Science and advanced temperature control algorithm, the static temperature error control in 0. Less than 5 ℃. Unique to overshoot inhibition function, can effectively protect the electronic components damage of overheating. Another EPRO software provides an oscilloscope function, can real-time monitor the temperature curve, and export to EXCEL spreadsheet will monitor curve, provide the basis for ascension reflow soldering process. PC series PLC controller in temperature control and communication advantages, to the customer engineers provided great support in use process, effectively improve the working efficiency and performance of the system, more and more widely used in reflow soldering industry.
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