?!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> 电气百科:变频器起动后跳“LU”故障分?/title><meta http-equiv="X-UA-Compatible" content="IE=EmulateIE7" /><meta name="description" content="变频器起动后跳“LU”故障分析;想获得变频器维修图纸以及相关技术资料请关注“从零开始变频器维修”公众号。案例现象:一台富士FRN11G11S变频器在频率上升?5Hz以上时,“LU”欠电压保护动作。案..."><meta name="keywords" content="电气百科:变频器起动后跳“LU”故障分?> <link href="/style/Template/public.css" rel="stylesheet" type="text/css" /> <link href="/style/Template/tech.css" rel="stylesheet" type="text/css" /> <script src="/Js/jquery-1.6.js" type="text/javascript"></script> <script src="/Js/ArticlePost/HitNum.js" type="text/javascript"></script> <script src="/Js/ArticleComments/ArticleComments.js" type="text/javascript"></script> <script src="/Js/Search/Search.js" type="text/javascript"></script> <script src="/Js/Public.js" type="text/javascript"></script> <script src="/Js/Advertisement/GetAdvertisement.js" type="text/javascript"></script> <script 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target="_blank">电气百科</a> >> <span>正文</span></div> <!-- main_content begin--> <div class="maincontent"> <!-- left begin --> <div class="news_left"> <div class="brand_news_details"> <h1>电气百科:变频器起动后跳“LU”故障分?/h1><table style="border-bottom:1px dotted #e4e4e4;" align="center"><tr><td><div class="news_mes">文章来源:从零开始变频器维修 作者:??点击?span id="HitNum"></span>?时间?span id="dTime">2019/3/14 11:58:11</span><input type="hidden" id="ID" value="100893071"/><input type="hidden" id="TypeID" value="2"/></div> </td> <td><div id="ckepop"></div></td></tr></table><div id="Content" style="display:none;">[电气百科:变频器起动后跳“LU”故障分析]:变频器起动后跳“LU”故障分析;想获得变频器维修图纸以及相关技术资料请关注“从零开始变频器维修”公众号。案例现象:一台富士FRN11G11S变频器在频率上升?5Hz以上时,“LU”欠电压保护动作。案...</div><div class="brand_news_con"><p style="text-indent:2em;"> 变频器起动后跳“LU”故障分析;想获得变频器维修图纸以及相关技术资料请关注“从零开始变频器维修”公众号?</p> <p style="text-indent:2em;"> 案例现象:一台富士FRN11G11S变频器在频率上升?5Hz以上时,“LU”欠电压保护动作?</p> <p style="text-indent:2em;"> 案例分析:变频器欠压故障是在使用中经常碰到的问题,主要是因为主回路电压太?220V系列低于200V?80V系列低于350V)或变频器自身原因。变频器自身的主要原因有:整流模块某一路损坏、滤波电容容量不足;其次是主回路接触器损坏,导致直流母线电压损耗在充电电阻上而导致欠压;再有就是电压检测电路发生故障而出现欠压问题?</p> <p style="text-indent:2em;"> 案例检查:首先检查输入侧电压是否有问题,然后检查电压检测电路。从整流部分向变频器电源输入端检查,发现电源输入侧缺相,由于电压表从另外两相取信号,电压表指示正常,没有及时发现变频器输入侧电源缺相。输入端缺相后,由于变频器整流输出电压下降,在低频区,因充电电容的作用还可调频,但在频率调至一定值后,整流电压下降较快、造成变频器“LU”跳闸?</p> <p style="text-indent:2em;"> 变频器起动后跳“LU”故障分?</p> <p style="text-indent:2em;"> 接通断相电路,试机正常?</p></div><div class="meneame"><span class="disabled">< </span><span class="current">1</span> <span class="disabled">> </span></div> <div style="text-align: center;padding-top: 10px;"><img src="/images/code.jpg" alt="关注有惊?" /></div> <div class="news_bot_mes">中国工业电器网:此内容转载于合作媒体或互联网其它网站,中国工业电器网登载此文出于传递更多信息之目的,并不意味着赞同其观点或证实其描述!</br>新闻、技术文章投稿QQ?28246603 邮箱:news@cnelc.com</div> <h2 class="related">相关阅读</h2> <ul class="related_con"> <li>· <a href="/text/32/190314/AD100893129_1.html" target="_blank">电气百科:变频器的安装要求您了解吗?</a></li><li>· <a 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