描述
由于目前的變頻器幾乎都采用PWM控制方式,這樣的脈沖調(diào)制形式使得變頻器運行時在電源側(cè)產(chǎn)生高次諧波電流,并造成電壓波形畸變,對電源系統(tǒng)產(chǎn)生嚴(yán)重影響,通常采用以下處理措施:采用專用變壓器對變頻器供電,與其它供電系統(tǒng)分離;在變頻器輸入側(cè)加裝濾波電抗器或多種整流橋回路,降低高次諧波分量,對于有進相電容器的場合因高次諧波電流將電容電流增加造成發(fā)熱嚴(yán)重,必須在電容前串接電抗器,以減小諧波分量,對電抗器的電感應(yīng)合理分析計算,避免形成LC振蕩。電動機溫度過高及運行范圍
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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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3M 031-808126
ACME TRANSFORMER TA-2-81325
ADELIN ADELIN1V4
ADVANCE DS-7270-131-PP-4
ADVANCE PCV-4240-42RVDE
ADVANCED CRYSTAL SCIENCES 50024
ADVANCED ENERGY 2194-015-T
ADVANCED ENERGY 3150010-001
ADVANCED ENERGY 3152012-041
ADVANCED ENERGY 3152012-043