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990NAD23022

价格 999.00元/个
total supply
43 个
MOQ
1 个
brand
施耐德
area
FujianXiamen City
Delivery period:
Shipped within 3 days from the date of payment by the buyer
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area:Fujian Xiamen City

Member level:corporate memberYear1

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Headquarter of Xiamen Zhongxinda Automation Equipment Co

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Product Details
123:
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  990NAD23022
厦门市仲鑫达自动化设备有限公司 
 
销售专员;陈国如 
 
电话;18030132586   QQ;1151195663   
 
厦门市思明区湖滨东路湖光大厦8楼A座990NAD23022
   
系统接地方式有:浮地方式、直接接地方式和电容接地三种方式。对PLC控制系统而言,它属高速低电平控制装置,应采用直接接地方式。由于信号电缆分布电容和输入装置滤波等的影响,装置之间的信号交换频率一般都低于1MHz,所以PLC控制系统接地线采用一点接地和串联一点接地方式。集中布置的PLC系统适于并联一点接地方式,各装置的柜体中心接地点以单独的接地线引向接地极。如果装置间距较大,应采用串联一点接地方式。用一根大截面铜母线(或绝缘电缆)连接各装置的柜体中心接地点,然后将接地母线直接连接接地极。接地线采用截面大于22 mm2的铜导线,总母线使用截面大于60mm2的铜排。接地极的接地电阻小于2Ω,接地极最好埋在距建筑物10 ~ 15m远处(或与控制器间不大于50m),而且PLC系统接地点必须与强电设备接地点相距10m以上。
 
信号源接地时,屏蔽层应在信号侧接地;不接地时,应在PLC侧接地;信号线中间有接头时,屏蔽层应牢固连接并进行绝缘处理,一定要避免多点接地;多个测点信号的屏蔽双绞线与多芯对绞总屏电缆连接时,各屏蔽层应相互连接好,并经绝缘处理。选择适当的接地处单点接点。
LOT OF 2!! ConVUM MPS-74M-NGHX DIGITAL VACUUM PRESSURE SWITCH W/4 SENSORS MPS-R8
 
 
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