描述
數(shù)控機(jī)床變頻器用CNC輸出0-10V控制轉(zhuǎn)數(shù)，電壓周期性波動(dòng)造成主軸轉(zhuǎn)數(shù)不穩(wěn)，信號(hào)線屏蔽層接地答：這個(gè)可以肯定的是電磁干擾引起的原因?yàn)橹鞯墓收稀?/p>
首先斷開這個(gè)負(fù)載，確定這個(gè)模擬量輸出是否穩(wěn)定，正常。信號(hào)線不但要接地，而且變頻器與控制器都需要接地，同時(shí)接地需要規(guī)范。
你用單端接地方式試一下，即將信號(hào)屏蔽線的金屬外層連接在控制器的接地端子上，在變頻器模擬量輸入的端子上，不做信號(hào)接地連接。
同時(shí)變更一下導(dǎo)線連接的位置。類似的問題我曾經(jīng)碰到過一次，有一西門子840d系統(tǒng)因24V電源模塊燒毀（3相輸入型），一時(shí)沒有相應(yīng)的電源模塊，我臨時(shí)用單相替代（用1個(gè)380/220V的隔離變壓器），結(jié)果該系統(tǒng)時(shí)不時(shí)的出現(xiàn)急停故障報(bào)警，當(dāng)時(shí)想不明白是什么原因，仔細(xì)思考了一下，會(huì)不會(huì)是因此處的隔離變頻器的臨時(shí)線與控制柜的急停按鈕控制線過近引起，將那個(gè)臨時(shí)線（扎帶去掉）分開，哎，這個(gè)故障就沒有再出現(xiàn)。這個(gè)例子也告訴我走線也很重要的。后來，等那個(gè)電源模塊到貨后，把它恢復(fù)原樣了。
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主營(yíng)：世界知名品牌的PLC、DCS系統(tǒng)備件模塊
①Allen-Bradley(美國(guó)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(guó)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(chǎng)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(hào)處理、數(shù)
據(jù)通信及處理等。Invensys Triconex:冗余容錯(cuò)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(cuò)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(dòng)模塊等。
◆Motorola（摩托羅拉）：MVME 162、MVME 167、MVME1772、MVME177等系列。
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