GP477R-EG11 XYCOM系统卡件
GP477R-EG11 XYCOM系统卡件
产品价格:¥2200(人民币)
  • 规格:GP477R-EG11
  • 发货地:厦门
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    商铺名称:厦门兴锐嘉进出口有限公司

    联系人:刘锦玉(小姐)

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      GP477R-EG11 XYCOM系统卡件 

      GP477R-EG11 XYCOM系统卡件 

      GP477R-EG11 XYCOM系统卡件 

      一、变频器的线路维护
      变频器的线路维护,可以了解成在变频器发作短路毛病时,变频器可以从电网上别离,防止电网问题扩大化,所以会涉及到变频器的进线开关器材、熔断器的装备,详细器材的容量的挑选,西门子小功率变频器的规范装备是刀熔开关加接触器的方式,大功率的变频器选用3WL断路器作为进线维护。

      图1 S120的整流侧结构图

      关于进线侧的开关熔断器等,一些规划人员考虑本钱问题, 总想尽可能的省去一些东西,其实有些因小失大。

      1、 空气断路器的呼应时刻是维护不了变频器的整流桥的。比方,进线不加快速熔断器,在变频器前端配上一个空气断路器,后边直接就连接到变频器的进线端子上,实际上这种规划从维护视点是不完善的, 当变频器直流发作短路毛病时,大电流流经变频器的整流桥,很简单形成整流侧的损坏。

      2、 操作空气开关瞬间,可能发作拉弧现象。比方,不加进线接触器,在变频器前端配上一个空气断路器,后边直接就连接到变频器的进线端子上,从安全视点也是存在危险的,可能对操作工形成伤害,实际上这种规划从操作视点是不便利的,打开变频器柜门,操作变频器上电掉电;如果在变频器的柜门经过按钮操作接触器,既便利又安全;另外在变频器发作毛病时,还可以自动分断进线侧的接触器, 防止毛病扩大化 。

      3、 有关变频器线路维护,进线侧必要的器材不能省去, 虽然说变频器毛病后会封闭输出, 可是变频器前端整流桥、直流回路的有些问题,变频器自身可能维护不了,从系统维护的可靠性方面剖析,开关器材也存在失效的可能,并且各自的功用也不一样,所以变频器进线维护器材不能省,不能因小失大。

      4、 进线没有维护损失惨重,血的经验。

      由变频器自身的条件所限,功率器材的耐压、电流的约束、作业温度等等,当变频器运转过程中到达或许挨近变频器的答应规模,就会宣布报警或许毛病信号,进行预警或许停机维护;变频器的维护功用许多,这儿以最常见维护功用举例,比方过压、欠压、过流、过热、缺相等等。

      1、 过压维护(F2):此功用是为了防止呈现直流母线电压过高,形成电容或许IGBT等器材损坏,变频器判断过压的检测点在直流母线,以3AC380-480V 沟通电压等级为例, 正常直流母线电压约为1.35倍的沟通进线电压核算,一般为DC 520V-DC 540V之间,当变频器所驱动的负载惯量比较大,快速降速时,或许变频器拖动位能性负载下放时,电机转子实际转速高于变频器输出给电机的转速,形成负载反拖电机,电机 处于发电运转状况,机械能转化为电能,经过变频器的逆变桥IGBT反并联二极管回馈到变频器的直流母线,因为直流母线的电容容量固定, 随着回馈能量的增加,直流母线电压随之升高,到达必定的限值可能导致器材的损坏,所以此刻有必要按捺过压趋势,比方投入制动单元制动电阻,激活直流电压操控器等等。
      2、 欠压维护(F3):此功用检测出变频器直流母线电压低于某个值,比方正常1.35倍的沟通电压,如果电压再低10%,此刻变频器可能发作欠电压报警或毛病,欠压毛病直接反映的是沟通侧可能呈现了问题,欠压维护的功用是防止变频器直流母线电压过低时,输出功率受限,功率器材的作业特性发作变化,操控电压异常,防止变频器硬件呈现损坏,一般操作也要先中止变频器输出,再分断进线开关,防止人为形成欠电压毛病。

      3、 过流维护(F1):一般变频器的输出电流超越变频器的额定输出电流某个约束值,一般是变频器厂家研制层面的细节,与IGBT功率器材选型规划裕量有关, 不同厂家,不同功率段也不一样。变频器自身的过流维护区别于电机的过流维护,一般滞后于电机的过流维护。

      4 、过热维护(F4):变频器运转过程中,功率器材会发热,正常情况下,变频器的散热风机可以使得变频器发热散热平衡,不至于变频器报毛病,可是当环境温度过高,变频器过载运转,冷却风机毛病、冷却风道不通畅,也会导致变频器过热,极点情况会导致功率器材损坏;一般引发过热毛病,大都因为变频器柜装置环境差,风道阻塞所造成的。

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