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Heating systems with PLC and frequency control

机译:带PLC和频率控制的加热系统

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摘要

In this work, medium capacity controlled heating system is designed and constructed. The programming method of control of heating process is achieved by means of integrated programmable logic controller (PLC) and frequency inverter (FI). The PLC main function is to determine the required temperatures levels and the related time intervals of the heating hold time in the furnace. FI is used to control the dynamic change of temperature between various operating points. The designed system shows the capability for full control of temperature from zero to maximum for any required range of time in case of increasing or decreasing the temperature. All variables of the system will be changed gradually until reaching their needed working points. An experimental study was performed to investigate the effect of tempering temperature and tempering time on hardness and fatigue resistance of 0.4% carbon steel. It was found that increasing tempering temperature above 550 ℃ or tempering time decreases the hardness of the material. It was also found that there is a maximum number of cycles to which the specimen can survive what ever the applied load was.
机译:在这项工作中,设计并构建了中容量控制的加热系统。加热过程控制的编程方法是通过集成的可编程逻辑控制器(PLC)和变频器(FI)实现的。 PLC的主要功能是确定所需的温度水平以及炉中加热保持时间的相关时间间隔。 FI用于控制各个工作点之间温度的动态变化。设计的系统显示了在温度升高或降低的情况下,可以在任何所需的时间范围内将温度从零到最高进行完全控制的能力。系统的所有变量将逐渐更改,直到达到所需的工作点。进行了实验研究以研究回火温度和回火时间对0.4%碳钢的硬度和抗疲劳性的影响。发现提高回火温度高于550℃或回火时间会降低材料的硬度。还发现,无论所施加的载荷是多少,样品都能经受住最多的循环次数。

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