描述
(1)测量电流或电压时,有一档或数档无指示,其它档指示正常.原因是钳形电表的紧固开关螺丝松动,或是其分线开关上的连线被扭断.这种故障最常见,开盖后将断线接好即可。
(2)电流档读数偏小,电压档读数正常.其原因大多是因钳口接触不好,漏磁太多造成的,应当修正钳口使其接触良好.这种故障有时是由于绕组间短路所引起的,这时就比较麻烦,一般米说要重新按照原数据绕制,还须进行老化处理.
(3)电流电压档的读数都偏低,这种现象在内磁式钳形电表上经常发生.原因是磁铁退磁,一般应当充磁解决,也可通过减小与表头支路串联的电阻值进行调整.
(4)其中某一档读数不准,应当调整相应的电阻.
(5)电压档指示正常,电流档全部没有指示.应用万用表检查初线开关和次级绕组,看是否有异常现象.
(6)全部无指示.应当检查整流二极管、表头、开关,以及与钳形表相连或有关的接线是否有断处.
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主营:世界知名品牌的PLC、DCS系统备件模块
①Allen-Bradley(美国AB)系列产品》
②Schneider(施耐德电气)系列产品》
③General electric(通用电气)系列产品》
④Westinghouse(美国西屋)系列产品》
⑤SIEMENS(西门子系列产品)》
⑥销售ABB Robots.FANUC Robots、YASKAWA Robots、KUKA Robots、Mitsubishi Robots、OTC Robots、PanasonicRobots、MOTOMAN Robots。
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顺序控制、梯形逻辑控制、事故追忆处理、数模转换、输入/输出信号处理、数
据通信及处理等。Invensys Triconex:冗余容错控制系统、基于三重模件冗余(TMR)
结构的zui现代化的容错控制器。
⑨Siemens(西门子):Siemens MOORE,Siemens Simatic C1,Siemens数控系统等。
⑩Bosch Rexroth(博世力士乐):Indramat,I/O模块,PLC控制器,驱动模块等。
◆Motorola(摩托罗拉):MVME 162、MVME 167、MVME1772、MVME177等系列。
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