Zhoushan Fishing Boats Refrigeration Control The Development And Application Of Key Technologies

With the development of deep-sea fishing, the application of the refrigeration system increases day by day on the fishing boat, its capacity is larger and larger, the control of the refrigeration system is improving constantly too. Combining the characteristic that the fishing boat works at present, this text proposes PLC control system of a set of refrigeration equipment.PLC control system is it control key component to regard PLC as, utilize special I/O module and is it can form hardware of control system with a small amount of measurement and peripheral circuit that control to mix, and then realize control to the whole system through programming. The whole control system is succinct and clear, it is simple and convenient to maintain; Operation dependability high, it keep control system of the relay disperse the advantage controlled, it is flexible to control , has avoided the dangerous shortcoming that concentrates of the computer control system again.The characteristic of PLC control system is suitable for using on the fishing boat.This text passes and analyses, after selecting PLC control technology, chose the control system of temperature and control method of the control system of the compressor again. Adopt definite value control method to temperature control system , decide to turn on according to difference in temperature of freezer degree all kinds of regulating valve, to meet the change of hot load; The control system of the compressor adopts frequency conversion to control, its frequency setting value is decided by the non-linear link. Thus finished the intelligent control of the refrigeration system.PLC refrigeration control system that this text develops is disposed flexibly , the configuration is convenient, expanding strong characteristic of function. Have choose the suitable control method in the course of controlling, has improved the performance of the refrigeration system, have economize the energy consumption of the refrigeration system, has improved systematic stability , dependability and refrigeration efficiency greatly .