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Hz逐步进行下降,下降到达的频率只要能起动系统就行?</p> <p style="text-indent:2em;"> 基底频率下限不要低于30 Hz。从转矩看,下限越低转矩越大。但亦要考虑,电压上升过快,动态du/dt过大时对IGBT有损伤。实际使用结果是,在50 Hz下降?0 Hz 的范围时可安全放心地使用此提升转矩的措施?</p> <p style="text-indent:2em;"> 有人担心,例如下降基底频率为30 Hz 时电压已?80 V。那么当正常工作有可能需要达?0 Hz 时,是否输出电压?80 V,这样电动机受不了,回答是这样的现象是不会发生的?</p> <p style="text-indent:2em;"> 有人担心如下降基底为30 Hz 时,电压已达380 V。那么正常工作有可能需要达50 Hz 时输出频率是否可达额定频?0 Hz,回答是输出频率当然可以达到50 Hz?</p> <p style="text-indent:2em;"> 二、用于敷设与信号处理 </p> <p style="text-indent:2em;"> <span>pk10全天人工计划网信号线及控制线应选用屏蔽线,这样对防止干扰有利。当线路较长时,例如距离?00 m,导线截面应放大些。信号线及控制线不要与动力线放置在同一电缆沟或桥架中,以免相互干扰,最好穿管放置,这样更合适?/span> </p> <p style="text-indent:2em;"> 传输信号以选用电流信号为主,因电流信号不容易衰减,亦不容易受干扰。实际应用中传感器输出的信号是电压信号,可以通过变换器将电压信号变换成电流信号;电流信号有所波动的话,可用电流调理器予以解决?</p> <p style="text-indent:2em;"> 变频器闭环控制一般都是正作用的,即输入信号大,输出量亦大(例如中央空调制冷工作时及一般压力、流量、温度等控制?。但亦有反作用的,即输入信号大,输出量反?例如中央空调在制热工作时以及供热站的取暖热水??</p> <p style="text-indent:2em;">pk10全天人工计划网 在闭环控制时能选用压力信号的,就不要选用流量信号。这是因为压力信号传感器价格低,安装容易,工作量小,调试方便。但工艺过程有流量配比要求的,且要求精确时,那就必须选用流量控制器,并根据实际的压力、流量、温度、介质、速度等来选用合适的流量?例如电磁式、靶式、涡街式、孔板式??</p> <p style="text-indent:2em;">pk10全天人工计划网 变频器内置的PLC、PID功能适合用于信号变动量较小、较稳定的系统。但由于内置的PLC、PID功能在工作时只调时间常数,所以难以得到较为满意的过度过程要求,而且调试比较费时?</p> <p style="text-indent:2em;">pk10全天人工计划网 信号变换器在变频器外围电路中亦被经常用到,一般由霍尔元件加电子线路组成。按信号变换和处理方式可分为电压变电流、电流变电压、直流变交流、交流变直流、电压变频率、电流变频率、一进多出、多进一出、信号叠加、信号分路等各种变换器。例如深圳的圣斯尔CE-T 系列电量隔离传感?变送器,应用十分方便。国内类似产品不少,用户可按需要自行选择应用?</p> <p style="text-indent:2em;"> <span>三、在应用时往往要配外围电路</span> </p> <p style="text-indent:2em;"> <span>由自制继电器等控制元件组成的逻辑功能电路?/span> </p> <p style="text-indent:2em;"> 买现成的单元外置电路(例如日本三菱公司??</p> <p style="text-indent:2em;"> 选用简易可编程控制器LOGO(国外、国内都有此产品)?</p> <p style="text-indent:2em;">pk10全天人工计划网 使用变频器不同功能时,可选用功能?例如日本三垦变频??</p> <p style="text-indent:2em;"> 选用中小型可编程序控制器?</p> <p style="text-indent:2em;"> 四、用于恒压供水中的方?</p> <p style="text-indent:2em;"> <span>现在用水一般采用恒压供水的方法?/span> </p> <p style="text-indent:2em;"> <span>由多台水泵并联恒压供水,常见变频恒压供水技术改造方案常见的有以下两种:</span> </p> <p style="text-indent:2em;">pk10全天人工计划网 节省初投资,但节能效果差。起动时先起动变频器?0 Hz 后,再起动工频,后转入节能控制。供水系统中只有采用变频器拖动的水泵,压力略小些,系统存在湍流现象,有损耗?</p> <p style="text-indent:2em;"> 投资较大,但比(1)多节能20%,猿台泵压力一致,无湍流损耗,效果更佳?</p> <p style="text-indent:2em;"> 多台水泵并联恒压供水时采用信号串联方式只用一个传感器,其优点如下?</p> <p style="text-indent:2em;"> <span>节省成本。只要一套传感器及PID?/span> </p> <p style="text-indent:2em;">pk10全天人工计划网 因只有一个控制信号,所以输出频率一致,即同频率,这样压力亦一致,不存在湍流损耗; </p> <p style="text-indent:2em;">pk10全天人工计划网 恒压供水时,当流量变化,泵的开动台数通过PLC 控制随之变化。最少时1 台,中等量时2台,较大量时3 台。当变频器不工作停机时,电路(电流)信号是通路?有信号流入,无输出电压、频??</p> <p style="text-indent:2em;"> 更有利的是,因为系统只有一个控制信号,即使3 台泵投入不同,但工作频率却相同,压力亦一致,这样湍流损耗为零,亦即损耗最小,所以节电效果最佳?</p></div><div id="jvj4gy5l4dy" class="meneame"><span class="disabled">< </span><span class="current">1</span> <span class="disabled">> </span></div> <div id="jvj4gy5l4dy" style="text-align: center;padding-top: 10px;"><img src="/images/code.jpg" alt="关注有惊?" /></div> <div id="jvj4gy5l4dy" 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@yxbest.cn</div> <h2 class="related">相关阅读</h2> <ul class="related_con"> <li>· <a href="/text/32/200113/AD100909313_1.html" target="_blank">电气百科:MLW3300涡流一体化传感?/a></li><li>· <a href="/text/32/200113/AD100909312_1.html" target="_blank">电气百科?000V及以下高压电机绕组匝</a></li><li>· <a href="/text/32/200113/AD100909311_1.html" target="_blank">电气百科:HZD-B-4一体化振动传感?/a></li><li>· <a href="/text/32/200113/AD100909310_1.html" target="_blank">电气百科:VSG-2I一体化振动变送器</a></li><li>· <a href="/text/32/200113/AD100909309_1.html" target="_blank">电气百科:SD-8磁电振动速度传感?/a></li><li>· <a href="/text/32/200113/AD100909308_1.html" target="_blank">电气百科:压力变送器的十点选用提示</a></li><li>· <a href="/text/32/200113/AD100909307_1.html" target="_blank">电气百科:MEISTER流量开关RVM/</a></li><li>· <a href="/text/32/200113/AD100909306_1.html" target="_blank">电气百科:LWQ-80-气体涡轮流量?/a></li><li>· <a href="/text/32/200113/AD100909305_1.html" target="_blank">电气百科:切断阀的作用和分类</a></li><li>· <a href="/text/32/200113/AD100909304_1.html" target="_blank">电气百科:直流电机与交流电机的优缺点</a></li> </ul> </div> <!-- comments begin --> <div id="jvj4gy5l4dy" class="comments"> <h4>网友评论<span>已有<span id="PeNum" style="float:left;"></span>人参与评?img src="/images/temp/comments.gif" width="65" height="20" onclick="HrefComment()" /></span></h4> <p style="padding-left:100px; 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