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發(fā)布者:zzdsd0001  發(fā)布時間:2021-07-28 10:15:54

在設(shè)備維修過程中,采用直接維修方法對大多數(shù)故障是適用的,但對一些因判斷失誤未找準(zhǔn)故障點而導(dǎo)致反復(fù)出現(xiàn)故障的部件或因無進口原備品備件造成設(shè)備停置的情況卻無法解決。此時如將現(xiàn)有的某些軟硬件或相似備品備件有機結(jié)合起來,采用替代的方法,則往往可以取得良好的效果。
  用西門子操作面板替代WACHEN-DORFF操作面板,設(shè)備故障描述我公司于1995年從德國Bastian公司進口了1臺幅寬2600mm的卷取機,用于水刺非織造布生產(chǎn)中的布面卷取。該機具有速度自動跟蹤、張力自動調(diào)節(jié)、全自動換卷功能,集機械液壓、氣壓、電氣于一體。系統(tǒng)采用西門子S5PLC程序控制對來自操作面板預(yù)置設(shè)定和操作指令及現(xiàn)場采集的各種檢測信號等參量進行控制。設(shè)備的人機界面采用OPUS-3N操作面板。在該操作面板上可完成接觸壓力、卷繞壓力、換卷米數(shù)等參數(shù)預(yù)置設(shè)定和操作控制命令。
  設(shè)備使用效果一直較好,但在2002年上半繁出現(xiàn)按鍵失效、復(fù)位后又能正常的故障。到9月份操作面板發(fā)生死機,已無法恢復(fù)使用。因無庫存配件,若購買原產(chǎn)品配件周期太長,整條生產(chǎn)線面臨著無法生產(chǎn)的局面。
  解決方案我公司于1997年引進的1條生產(chǎn)線,其中配套的設(shè)備也有德國Bastian公司同型號幅寬3600mm的卷取機。此卷取機與2600mm卷取機相比做了少許改進,但基本結(jié)構(gòu)功能一致。電氣控制上仍采用西門子S5PLC,但操作面板更新為西門子OP15機有1個備用OP15-A1面板,我們試圖用其替代OPUS-3N在2600mm卷取機上使用。經(jīng)過對照分析,兩者雖然軟件功能存在差異,但只要在外部硬件上做些改造,OP15-A1是可以用在2600mm卷取機上的。
  具體措施替代時,裝好OP15-A1,接上電源線和數(shù)據(jù)傳輸線,在裝有SIMENSPROTOOLCS組態(tài)軟件的計算機里對OP15-A1進行組態(tài),并用編程器PG720或用已經(jīng)固化程序的EEPROM對PLC進行傳輸或拷貝新程序。一切安裝完畢后,斷開電源線,連接上PLC與OP15-A1(SS2A串行口)的通信線界面顯示“centercut”閃爍報警信號。說明系統(tǒng)的檢測、加載軟件及傳送數(shù)據(jù)均正常,PLC與OP15通信成功。該故障信號是“中分刀”過載保護報警,而原設(shè)備沒有使用中分刀,參閱資料后,直接采用導(dǎo)線短接,輸入假信號,故障消失,界面切換到待機狀態(tài)。
 這時可以啟動液壓油泵,測試設(shè)備各部分動作。首先調(diào)試設(shè)備的速度,通過面板預(yù)置設(shè)定不同的張力(N),張力架總是升到頂端,速度達(dá)到最快而且不可控。檢測張力架牽引裝置電機速度控制器(A83)給定,電壓信號值為負(fù)值(-100VDC),即PLC輸出信號為負(fù)值,控制器信號給定標(biāo)準(zhǔn)不符,需要轉(zhuǎn)換。我非織造布們在PLC輸出信號和控制器輸入信號之間裝上電壓反相器后,速度恢復(fù)可控。其次在做切布動作測試時,小接觸臂、切刀機構(gòu)等一系列動作均未執(zhí)行操作。經(jīng)檢查是由于接觸臂上的限位開關(guān)信號相互錯亂,通過逐個調(diào)整后正常。最后,調(diào)試設(shè)備運轉(zhuǎn)當(dāng)中的換卷,這時出現(xiàn)小卷換卷和大卷換卷時接觸臂總是抬得不到位的問題。經(jīng)過分析,與接觸臂上電位器給定的角度值有關(guān),程序設(shè)定的角度值為10V/350°,而現(xiàn)在的值為10V/175°,給定值太大,導(dǎo)致?lián)Q卷失敗。停機更換10KΨ350°電位器(FCG公司產(chǎn))并確認(rèn)無誤后,再次開機試換卷,工作正常。再對其一系列連動操作,設(shè)備整體工作正常,可以聯(lián)機生產(chǎn)了。替代并調(diào)試成功,前后共花了大約8h,順利地恢復(fù)了正常生產(chǎn)。更換至今設(shè)備已經(jīng)穩(wěn)定運行了近2年,各種性能指標(biāo)都達(dá)到要求。
  用變頻器替代馬達(dá)控制器,設(shè)備故障描述法國ICBTPERFOJET公司生產(chǎn)的水刺機,安裝有1臺大功率的GV1抽吸風(fēng)機(110kW)。該風(fēng)機主要作用是將水刺非織造布經(jīng)高壓水針板針刺后再抽吸掉大部分水份。為減少GV1啟動對電網(wǎng)的沖擊,保護GV1的安全使用,配用了1臺美國AB公司產(chǎn)的智能馬達(dá)控制器SMCPLUS型號為150-A97NBD.該控制器具有軟啟動功能和啟動故障、溫度故障、馬達(dá)失速、線路故障保護性能。2002年11月份控制器出現(xiàn)異常,當(dāng)啟動風(fēng)機時,馬達(dá)未加到滿速控制器就出現(xiàn)線路故障,即控制器上的故障(FAULT)和線路(LINE)發(fā)光二極管發(fā)光。經(jīng)檢查,主回路的兩組250A熔斷器燒斷和控制器內(nèi)部1組可控硅整流器短路。由于沒有原配備品備件更換,整條生產(chǎn)線面臨著停產(chǎn)。
  解決方案因在設(shè)備引進時,有1臺ABB公司的ASC504-120-3變頻器作為備用。該變頻器具有運行性能穩(wěn)定、擴展性能強、維護方便等特點。經(jīng)過分析,決定采用該變頻調(diào)速器替代智能馬達(dá)控制器。根據(jù)電氣技術(shù)要求,用調(diào)速電位器通過變頻器對電機在0~2980轉(zhuǎn)/min范圍內(nèi)無級調(diào)速,再通過內(nèi)部參數(shù)的設(shè)置和操作實現(xiàn)對GV1抽吸風(fēng)機的控制,以保證設(shè)備正常運轉(zhuǎn)。
  具體措施速開關(guān)選用2W、10KΨ繞線電位器(RP),接至變頻器的外部給定調(diào)節(jié)輸入點(REF、GND2、A1),可以使變頻器的輸出頻率在0~50Hz范圍內(nèi)改變,從而實現(xiàn)對電機的無級調(diào)速;啟動/停止信號接至變頻器的啟動/停止點(SPL、DI1);將報警信號接至變頻器的繼電器輸出點(RO31、RO32),當(dāng)變頻器工作異常時報警停機。
  參數(shù)并開機調(diào)試設(shè)備。將變頻器的啟動頻率由1Hz緩慢上升(即電機轉(zhuǎn)速由0轉(zhuǎn)/min緩慢上升),并監(jiān)視變頻器的輸出電流和GV1風(fēng)筒上的抽吸儀表指示。當(dāng)變頻器的頻率上升到49.5Hz時,變頻器輸出電流為176A,抽吸量指示為-105mbar,能夠滿足生產(chǎn)需要,迅速地恢復(fù)了生產(chǎn)。
  結(jié)語通過生產(chǎn)實踐中的實例說明,采用替代的方法維修設(shè)備具有針對性,使維修工作變得簡單。采用這種方法不但降低了停產(chǎn)時間,而且節(jié)約大量資金,對于改造類似的進口設(shè)備有很好的借鑒作用。

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