外文翻译--可编程控制技术在船用锅炉控制系统中的应用.doc

The application of PLC technique in the control of marine boilers Programmable foreword controller, Is called PC or PLC, It appears causes the control domain faced with a technical transformation Take the relay as the foundation engine room control device structure complex, the component are many, The reliability is bad, The breakdown sometimes occurs The current our country ships use the import complete set control device, Its function consummates, The reliability is also high, But the price is expensive Number year ago, I use import PLC am the controller, Own design the hardware, Establishment control procedure, Develops successfully the PC-GC programmable boiler combustion control installment, Substitutes for the English HAMWORTHY Corporation product In the near future the similar product will compare with this company, Performance quite, The price only is its 12.5~13.4 year, Altogether has PC-GC to install 12 sets in Dazing 414 and so on 6 Strip oil tanker solid ship use, Experiences the South China Sea storm and the nearly 70 ℃ high temperature adverse circumstance tests, Moves good, Does not have a breakdown The experience indicated, Introduces the minority essential component, According to concrete control system request, Designs the appropriate software and the necessary hardware, Is the ships technological transformations and the equipment disposition good means 1 system composition The system is composed by below several parts: Programmable foreword controller PC; Power source PS; Examination unit Cooperation unit OB; Actuation unit M; Display monitor IB; Auxiliary relay unit JB; Line bank L, Like chart 1 shows The first six parts are the control device basic composition This installment additionally builds auxiliary relay unit JB including four 8 ports intermediate relay J1, J2, J3 and J4 and 12 ports light controls relay JGC. When the controller output must actuate the high-power load, Needs to carry on the voltage or the power conversion through the int