描述
過載保護運行閥值的整定點在電動機額定電流的0.95~1.05左右,即運行電流在額定電流的1.1倍以下時,電動機能長期運行不應(yīng)該產(chǎn)生保護停機動作;過載程度繼續(xù)加大時,保護動作時間應(yīng)隨過流程度而縮短。一般認為,電動機的起動電流為額定電流的4~7倍,保護動作應(yīng)該既能避開正常的起動電流,又能在過載時,實施有效的停機保護。比如在4倍額定電流時,延時10s產(chǎn)生保護動作,在7倍額定電流時,延時2s即應(yīng)產(chǎn)生保護動作。對運行中的短時過載,有一定的時間延時處理,不會產(chǎn)生誤保護動作,對長時間過載,則能作出有效的反應(yīng)。
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主營:世界知名品牌的PLC、DCS系統(tǒng)備件模塊
①Allen-Bradley(美國AB)系列產(chǎn)品》
②Schneider(施耐德電氣)系列產(chǎn)品》
③General electric(通用電氣)系列產(chǎn)品》
④Westinghouse(美國西屋)系列產(chǎn)品》
⑤SIEMENS(西門子系列產(chǎn)品)》
⑥銷售ABB Robots.FANUC Robots、YASKAWA Robots、KUKA Robots、Mitsubishi Robots、OTC Robots、PanasonicRobots、MOTOMAN Robots。
⑦estinghouse(西屋):OVATION系統(tǒng)、WDPF系統(tǒng)、MAX1000系統(tǒng)備件。
⑧Invensys Foxboro(??怂共_):I/A Series系統(tǒng),F(xiàn)BM(現(xiàn)場輸入/輸出模塊)
順序控制、梯形邏輯控制、事故追憶處理、數(shù)模轉(zhuǎn)換、輸入/輸出信號處理、數(shù)
據(jù)通信及處理等。Invensys Triconex:冗余容錯控制系統(tǒng)、基于三重模件冗余(TMR)
結(jié)構(gòu)的zui現(xiàn)代化的容錯控制器。
⑨Siemens(西門子):Siemens MOORE,Siemens Simatic C1,Siemens數(shù)控系統(tǒng)等。
⑩Bosch Rexroth(博世力士樂):Indramat,I/O模塊,PLC控制器,驅(qū)動模塊等。
◆Motorola(摩托羅拉):MVME 162、MVME 167、MVME1772、MVME177等系列。
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