di-soric SLI2-1503-S
在安装SL4安全系统之前,请检查以下所有条件:
?SL4 (Type 4, SIL3, SILCL3 PLe)的保护级别必须与要保护的系统的危险级别。
?安全系统仅用作停止装置,而不是控制机器。
?机器的运动是由电驱动的。
?机器所有危险动作均可立即中断。在特别地,必须知道机器的停止时间,如果有必要,还必须测量。
?机器不得因物料的投射或掉落而产生危险以上;否则,必须提供额外的机械保护。
?需要检测的最小大小的对象必须大于等于所选模型的分辨率。知道了危险区域的形状和尺寸,就可以计算危险区域有关通道的宽度及高度:
?比较这些尺寸与最大工作范围和高度使用的模型的保护区域。定位安全装置前,应注意以下事项:
?检查系统安装环境温度与产品标签上所示的工作温度参数相符还有技术数据。
?不要将发射器和接收器放置在非常明亮或闪烁的光源附近的光。
?特殊的操作条件可能会影响光电器件的传感水平。在以雾、雨、烟雾或粉尘为特征的环境中,要始终保证正确操作器具,宜采用合适的校正因子Cf使工作范围值达到最大值。在这些情况下:Pu和Pm分别在哪里,工作和最大范围表示为米。主从连接电缆的长度可达50米。这个特性允许应用程序配置两个光幕一个在危险机器的前面,一个在后面,用一个到机器的电源和控制电路(图4)。光幕的放置距离必须大于等于最小值安全距离使危险点只有在停车才能到达机器的危险运动(图5)。根据EN999:2008欧洲标准,最小安全距离必须
计算公式如下:
当使用多个SLB4时,必须采取预防措施防止光干涉在这些之间:定位元件,使一个系统的发射器的光束是只由其各自的接收方接收。图6给出了两个光电系统正确定位的例子。不正确的定位可能引起干扰,可能导致系统故障为保护或控制从几个侧面可到达的区域,一个或多个偏转镜子可以使用除了发射器和接收器。偏转镜使发射器产生的光束有可能被重定向
几个方面。希望使发射器产生的光束偏转90°,垂直于镜子的表面必须与光束的方向成45°角。两个偏转镜用于“U”形保护的应用如下图所示。使用偏转镜时,应遵守以下规则:
?安装后视镜,使其符合最小安全距离(图7)每边进入危险区域。
?工作距离(工作范围)由所有的长度之和给出进入保护区域的两侧。(注意最大工作范围发射器和接收器之间减少15%,每使用一面镜子)。
?在安装阶段,注意避免沿纵轴扭转镜子。
?站在靠近接收器的轴线上,检查发射器在第一面镜子上可见。
?建议不要使用超过三个反射镜。靠近光幕的反光表面的存在可能会偶尔引起阻止感知的反射。参考图8,对象没有被检测到,原因是反射光束的表面,关闭发射体和接收器。因此,在任意反射面和防护区域。最小距离必须是根据发射器和接收器之间的距离计算,并取考虑到投影和接收的角度是4°。
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