描述
图中数据存储单元DM01为快速换速距离脉冲数,DM30为楼层间距脉冲数,DM31为快速换速点对应的脉冲数,DM34为高速换速比较区间下限,DM35为高速换速比较区间上限,HR01为快速换速点开始信号,1507为快速运行信号,1700为选层信号,0010为零速信号,0503为快速换速输出信号。
以上行为例,DM31快速换速点对应的脉冲数是楼层间距DM30与快速换速举例DM01之差;DM31和DM30的值分别赋给DM34和DM35。运行时高速计数器不断累加脉冲数,每个扫描周期计数器的值与DM34~DM35区段进行比较。当其值进入DM34与DM35区段时,HR01置位,表示进入快速换速区间;若此时有选层信号且电梯为快速运行,则发快速换速信号(0503置ON)。
4结论
本文所述系统基于电气集选控制原则,采用脉冲计数方法,用脉冲编码器取代井道中原有的位置检测装置,实现位移控制,用软件代替部分硬件功能,既降低系统成本,又提高了系统的可靠性和安全性,实现电梯的全数字化控制。
在实验室调试的基础上,采用上述方法,实地对两台17层电梯进行改造,经有关部门检测和近一年的实际运行表明,系统运行可靠,乘坐舒适,故障率大为降低,平层精度在±5mm以内,取得了良好的运行效果。
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1,《发电厂DCS监控系统》
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6,《化工厂药液恒流量计算机控制系统》
7,《电气控制系统》造纸,印染生产线,变电站综合自动化控制系列
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