IC698CPE020
IC698CPE020
IC698CPE020
为了提高系统的可靠性,在设计中采取了如下措施:
.PLC采用单独供电且接地线单独接地.
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.工控机和弱电部分供电通过在线式500W UPS,既净化了弱电供电电源,又可保证工控机不会因为突然掉电而丢失数据.
.要求整个系统接地电阻小于1Ω.
.工控机和重量仪表中控制输出及报警输入全部采用光电隔离技术,有效防止外部干扰信号进入.
.交流接触器全部安装阻容吸收.
.中间继电器线包全部安装二极管吸收回路.
.各种弱电传输电缆全部采用屏蔽线,并且屏蔽层单端接地.
5.2提高精度与生产效率的措施
采用除n取余震荡曲线法对落差跟踪式调整,在生产过程中可以自动修正,亦可设固定落差.这样能保证骨料误差在±2%以内,而其它粉料在±1%内.通过对数据的预先处理,在连续生产中可提前称料来提高效率.
另采取一些其它的方法:
.对水泥、粉煤灰采用变速给料来减少冲量影响.称量时,先高速给料,达到设定值的90%左右后自动变为低速配料,实现精称.
.对骨料(石、砂)采用双料仓和逐次逼近的精称方法.粗称时两仓全开,快速达到关门值(配方值-落差)后关闭出料门,稳定后根据与配方值的差距量自动计算出脉冲补料时 间,然后仅开精出料门,一般经过1-2次补料就能完成精称配料.
.对水采用粗、细管加水方案,实现流量精称.
通过以上技术措施,不但提高了称量精度,而且保证了生产效率.
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