PLC控制器6DS1315-8AC
改造之前的提升机电控系统中,电动机采用传统的转子串电阻调速方式,随着电力电子技术的持续发展,该调速方式已经属于非常落后的一种调速技术,面临着被淘汰的局面。该调速方式主要存在以下问题:
(1)提升机频繁启动与制动,在加、减速过程中,转子上所串的电阻会产生严重的能耗,浪费大量电能;
(2)转子串电阻调速系统中,大量电能消耗在转子所串的电阻上,能量以热的形式消耗掉,导致周围环境温度升高、工作环境变差;
(3)转子串电阻调速系统存在控制电路复杂、工作稳定性和可靠性差、缺乏故障诊断功能等问题;
(4)启动时冲击电流大,造成很大的机械冲击,大大降低电动机的使用寿命;
(5)转子串电阻调速系统属于有级调速方式,调速范围窄,调速精度差,爬行时速度不易控制,特别是在重车下放时,需要动力制动、转子串电阻及制动闸瓦配合操作,绞车司机操作困难,不易控制,安全性能差;
(6)转子串电阻调速系统电动机均采用绕线式电动机,存在有滑环接触不良、维护工作量大、维护费用高等缺点。
针对上述问题,矿方经过多方考察生产厂家及现场实际使用情况,最终决定重新采购一套电控系统,电动机采用汇川公司的HD92型四象限高压变频器驱动,彻底替换掉之前使用的调试系统。采用这种新型的电控调速方案,大大提高了整个提升机系统安全可靠性、控制精度及调速性能,在提高用户生产效率的同时,还起到了节能减耗的目的。
PLC控制器6DS1315-8AC
PLC控制器6DS1315-8AC
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PLC控制器6DS1315-8AC