Y751_0301 MET2-MC/4/16F
Y751_0301 MET2-MC/4/16F
Y751_0301 MET2-MC/4/16F

控制系統(tǒng)結(jié)構(gòu)
　　PLC采用羅克韋爾自動(dòng)化/ AllenBradley ControlLogix控制系統(tǒng)，完成設(shè)備的連續(xù)集中控制。采用單CPU處理器，處理器選用1756-L61。
　　各子系統(tǒng)I/O擴(kuò)展和上位通訊考慮采用符合IEC 61158的開放現(xiàn)場(chǎng)總線ControlNet系統(tǒng)，冗余鏈路配置。 ControlNet為令牌總線方式的實(shí)時(shí)控制網(wǎng)，通訊速率5MBit/秒，冗余配置，其上掛接混合型控制器CPM和服務(wù)器， ControlNet的傳送方式可以保證實(shí)時(shí)數(shù)據(jù)何時(shí)傳送(確定性)，并不會(huì)因網(wǎng)上節(jié)點(diǎn)的增減而改變 (重復(fù)性)，介質(zhì)為RG6同軸電纜，BNC連接器，長度可達(dá)1km，加擴(kuò)展器可擴(kuò)展達(dá)6km。ControlLogix 系統(tǒng)為多種類型的控制提供了的控制平臺(tái)，在這一個(gè)平臺(tái)上，就可以實(shí)現(xiàn)順序控制、過程控制、傳動(dòng)或運(yùn)動(dòng)控制的任意組合控制。因?yàn)檫@個(gè)平臺(tái)是模塊化的，所以就能夠有效地設(shè)計(jì)、建立和更改平臺(tái)，地節(jié)約了工程實(shí)施費(fèi)用。通過先進(jìn)的組態(tài)工具、內(nèi)存結(jié)構(gòu)和需要較少編程和內(nèi)存的符號(hào)編程，可以大大提高工程的生產(chǎn)率。內(nèi)存分為程序區(qū)和用戶數(shù)據(jù)區(qū)，采用完全的自動(dòng)內(nèi)存分配機(jī)制，開發(fā)人員無需人工分配系統(tǒng)內(nèi)存，支持靈活的網(wǎng)絡(luò)結(jié)構(gòu)，無需任何編程或者處理器干預(yù)，即可實(shí)現(xiàn)不同網(wǎng)絡(luò)之間的通訊橋接和數(shù)據(jù)交換。
　系統(tǒng)的網(wǎng)絡(luò)結(jié)構(gòu)如下圖所示:每個(gè)主排風(fēng)機(jī)有一個(gè)獨(dú)立的控PLC以及 PanelView Plus 1000作為人機(jī)界面接口。這些設(shè)備以及變頻器的PLC通過1756- CNBR模塊組成ControlNet網(wǎng)絡(luò),這個(gè)網(wǎng)絡(luò)通過燒結(jié)主系統(tǒng)的PLC2遠(yuǎn)程IO站與燒結(jié)主系統(tǒng)L1網(wǎng)絡(luò)連接.變頻器(VFD)PLC有一個(gè)ControlNet IO網(wǎng)絡(luò),兩個(gè)Point IO 分別控制MB3(Motor1)、MB4(Motor2)的勵(lì)磁盤，1756-A10框架及20-COMM-C完成變頻器本體的控制及數(shù)據(jù)交換，本地框架主要是高壓盤等外圍接口狀態(tài)采集及控制。
　　由于ControlLogix 系統(tǒng)的開放性及靈活性，可以在燒結(jié)L1網(wǎng)絡(luò)的任意位置通過Drive Executive工具對(duì)變頻器進(jìn)行組態(tài)及維護(hù)，也可以由PLC經(jīng)由ControlNet 網(wǎng)絡(luò)通過20-COMM-C模塊修改變頻器控制參數(shù)。這里由于兩臺(tái)馬達(dá)動(dòng)態(tài)參數(shù)有較大的差別，為了達(dá)到理想的控制效果，在起動(dòng)前由PLC寫入針對(duì)該馬達(dá)的控制參數(shù)。程序如圖3所示。
實(shí)際上，只要對(duì)外圍系統(tǒng)進(jìn)行簡(jiǎn)單的改造，將來本起動(dòng)裝置可以起動(dòng)一燒結(jié)9300KW直流無刷勵(lì)磁同步電動(dòng)機(jī)，也可以起動(dòng)規(guī)劃中的4000-5000KW的脫硫增壓風(fēng)機(jī)，而且可以是任何形式的10KV 高壓電動(dòng)機(jī)。系統(tǒng)的開放性在這里得到了充分的體現(xiàn)。
　　七、改造效果
　　原有設(shè)備拆除，新設(shè)備在線安裝、調(diào)試全部工作在10天內(nèi)完成，確保了年修節(jié)提前36小時(shí)完成，實(shí)現(xiàn)效益450萬元。
　　新設(shè)備運(yùn)轉(zhuǎn)平穩(wěn)，靜止?fàn)顟B(tài)下起動(dòng)成功率，并網(wǎng)沖擊小，頻率差 <0.1Hz、電壓差 <3%、相位差<3°。
　　綜上所述，起動(dòng)裝置改造性能指標(biāo)完全達(dá)到設(shè)計(jì)要求，改造取得圓滿成功。

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