C9900-R221

C9900-R221

故障在控制系統中一般反映在信號的不正常，這類設備安裝時信號線的屏蔽層應單端可靠接地，并盡量與動力電纜分開敷設，特別是高干擾的變頻器輸出電纜，而且要在PIC內部進行軟件濾波。這類故障的發現及處理也和日常點巡檢有關，發現問題應及時處理。

第六類故障主要是電源、地線和信號線的噪聲（干擾）

問題的解決或改善主要在于工程設計時的經驗和日常維護中的觀察分析。

要減小故障率，很重要的一點是要重視工廠工藝和操作規程，在日常的工作中要遵守工藝和操作規程，嚴格執行—些相關的規定，如保持集中控制室的環境等等，同時在生產中也應加強這些方面的管理。

過程控制系統本身是一個完整的系統，所以在分析故障或處理故障時也要注意系統性，單獨的對某一部分的優化有時并不能提高系統的整體性能。如過分追求元器件的精度而不考慮實際的需要以及和相關設備精度的匹配，將徒然增加系統成本。在日常維護中也有過把系統越改越復雜的現象，如采用復雜的控制方式和設備來實現本可以用簡單裝置來實現的控制，違背了經濟、簡單、實用的原則，并可能會增加故障率，這也是要注意的地方。

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