abstractDepend on the progress of the industry and the development progress and the development of modern society become more and more, modern industry more and more to promote reducing the number of workers to reduce the cost of production, automation and mechanization operation became the widely used in modern factory production. Mechanical operation of longer resulting heat for many months, if this is the hot summer, outside temperature is high coupled with the heat generated by the machine itself, mechanical temperature is going to reach a very high temperature, which not only can affect the mechanical work efficiency, but also greatly shorten the service life of the mechanical. So in the modern industrial production to the required machinery for heat treatment to become an important work. The traditional cooling system is simple and crude, although it can also play a good heat radiation effect, but it will bring some new problems, such as the waste of a lot of energy, improve the production cost.PLC full name programmable logic controller, as a kind of special application in the industrial control computer, since it was applied to the industry, with many advantages and diverse functions and has been recognized by the market. In the design will be PLC and fan, water pump, frequency converter combined with sensor technology, PLC control technology, frequency conversion speed regulation technology, configuration and monitoring technology, to fan and water pump is taken as a controlled object composed a complete cooling control system. It can not only will want the temperature stability of the parts of the radiation in a suitable temperature, avoid temperature is too high to bring the adverse effect, can also reduce fan, produced during the operation of water pump energy consumption, to avoid the waste of energy, reduce the cost of industrial production, but also protect the environment.Monitoring system can realize controlled object fan and pump running state monitoring and control of the whole system, upper computer system with touch screen, can realize the real-time monitoring of various important parameters and main equipment fault alarm and other functions, greatly simplifying the operation personnel"s workload, to achieve a good human-computer interaction.Key words: fan, water pump, PLC, frequency conversion speed regulation, touch screen
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