描述
VME162PA-252SE
在企业生产中,往往需要有稳定的压力、温度、流量、液位或转速,作为保证产品质量、提高生产效率、满足工艺要求的前提,这时就要用到变频器的PID控制功能。PID控制在生产过程中是一种普遍采用的控制方式,在机电、冶金、机械、化工等行业中获得了广泛的应用。通过变频器实现PID控制有两种情况:一种是变频器内置PID控制功能,给定信号通过变频器的键盘面板或端子输入,反馈信号反馈给变频器的控制端,在变频器内部进行PID调节以改变输出频率;另一种是用外部的PID调节器将给定量与反馈量比较后输出给变频器加到控制端子作为控制信号。总之,变频器的PID控制是与传感器元件构成的一个闭环控制系统,可以实现对被控制量的自动调节。 设计PLC控制系统时,常常会需要在外部改变PLC内部的数据,如Counter、Timer或者Data的值,以适应生产过程的需要。而且要求系统关机以后,这些数据还能够保存在PLC内部,当下次开机后,这些数据可以被调出继续使用。于是许多PLC都提供了掉电保持寄存器,以便在PLC断电的时候保存用户想要保存的数据。SPD的电压保护水平Up应始终小于被保护设备的冲击耐受电压Uchoc,并且大于根据接地类型得出的电网最高运行电压Usmax,即Usmax<Up<Uchoc,若线路无屏蔽,尚应计入线路感应电压,Uchoc宜按其值的80%考虑;SPD与被保护设备两端引线应尽可能短,控制在0.5m以内;
如果进线端SPD的Up加上其两端引线的感应电压以及反射波效应与距其较远处的被保护设备的冲击耐受电压相比过高,则需在此设备处加装第二级SPD,其标称放电电流In不宜小于8/20μs3kA;当进线端SPD距被保护设备不大于10m时,若该SPD的Up加上其两端引线的感应电压小于设备的Uchoc的80%,一般情况在该设备处可不装SPD;
当按上述第3点要求装的SPD之间设有配电盘时,若第一级SPD的Up加上其两端引线的感应电压保护不了该配电盘内的设备,应在该配电盘内安装第二级SPD,其标称放电电流In不宜小于8/20μs5kA;
当在线路上多处安装SPD时,电压开关型SPD与限压型SPD之间的线路长度不宜小于10m,限压型SPD之间的线路长度不宜小于5m。例如:被保护设备与配电中心距离较近,在线路敷设上可特意多绕一些导线;
当进线端的SPD与被保护设备之间的距离大于30m时,应在离被保护设备尽可能近的地方安装另一个SPD,通流容量可为8kA;
选择SPD时应注意保证不会因工频过压而烧毁SPD,因SPD是防瞬态过电压(μs级),工频过电压是暂态过电压(ms级),工频过电压的能量是瞬态过电压能量的几百倍,因此,应注意选择较高工频工作电压的SPD;
SPD的保护:每级SPD都应设保护,可采用断路器或熔断器进行保护,保护器的断流容量均大于该处最大短路电流;
产品承诺:
保 证 全新原装进口,
保 证 安全准时发货,
保 证售后服务质量,
优势价格,大量现货。
主营DCS系统配件
机器人系统配件
大型伺服系统配件
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专业销售进口DCS PLC系统备件模块
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