ADEPT SCARA 550
ADEPT SCARA 550
ADEPT SCARA 550
ADEPT SCARA 550變頻調(diào)速技術(shù)目前已廣泛應(yīng)用于低壓異步電動機(jī)。在高壓(3kV及以上)電動機(jī)的應(yīng)用,盡管技術(shù)趨于成熟,但造價偏高,受到一定限制。因此,首先進(jìn)行分析,再結(jié)合工藝要求、現(xiàn)場實際和多方案對比,決定采用ABB ACS1000變頻器對風(fēng)機(jī)進(jìn)行改造。
系統(tǒng)借助具有模擬輸入輸出的可編程序控制器(PLC)與變頻器相結(jié)合,按工藝要求控制風(fēng)機(jī)在全范圍內(nèi)的調(diào)速、檢測、控制。變頻裝置采用(閉環(huán))自動控制和(開環(huán))手動控制兩種方式,并可方便切換。其控制要點:
?。?)根據(jù)煉鋼工藝要求,按梯級方式控制風(fēng)機(jī)的轉(zhuǎn)速或通過手動調(diào)節(jié)裝置實現(xiàn)全范圍調(diào)速。
?。?)檢測煙塵含量,通過PID、PLC進(jìn)行閉環(huán)連續(xù)或跳躍(即設(shè)定梯級轉(zhuǎn)速)調(diào)節(jié),可以實現(xiàn)自動/手動之間的切換。
(3)考慮到與原有DCS系統(tǒng)的通信, PLC采用SIMENS S7 200系列,其輸入來自從現(xiàn)場設(shè)備中采集的信號,其輸出控制變頻器、電動機(jī)及工業(yè)過程中的其他設(shè)備。
變頻器修理前不但要注意供電設(shè)備的整潔度,還要注意被損壞的供電設(shè)備產(chǎn)生漏電問題,穿專業(yè)的工作服按標(biāo)準(zhǔn)的操作工序來測試電流或電壓,可以使電路的開發(fā)更加簡便快速。
首先,變頻器修理不但要求具有操作水平較高的電工進(jìn)行測試,還要求變頻器修理人員必須具備有一定的實踐經(jīng)驗,變頻器修理的常見方法有靜態(tài)測試和動態(tài)測試這兩種不同的基本測試方法,除了使用專業(yè)的測試儀將電路的逆變模塊數(shù)據(jù)測試出來,還要測試整流電路的基本情況,當(dāng)測試時如果阻值顯示不平衡,說明整流橋或啟動電阻出現(xiàn)了故障。
ADEPT SCARA 550
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