为了**系统的正常运行,定期对PLC系统进行检查和维护是必不可少的,而且还必须熟悉一般故障诊断和排除方法。
一、检查与维护
1.定期检查
PLC是一种工业控制设备,尽管在可靠性方面采取了许多措施,但工作环境对PLC影响还是很大的。所以,通常每个半年时间应对PLC做定期检查。如果PLC的工作条件不符合表1规定的标准,就要做一些应急处理,以便使PLC工作在滚规定的标准环境。
表1 周期性检查一览表
检查项目 |
检查内容 |
标准 |
交流电源 1.电压 2.稳定度 |
1.测量加在PLC上的电压是否为额定值 2.电压电源是否出现频繁急剧的变化 |
1.电源电压必须在工作电压范围内 2.电源电压波动必须在允许范围内 |
环境条件 温度 湿度 振动 粉尘 |
温度和湿度是在相应的范围内吗?(当PLC安装在仪表板上时,仪表板的温度可以认为是PLC的环境温度) |
0~55℃ 相对湿度85%以下 振幅小于0.5mm(10~55Hz) 无大量灰尘,盐分和铁屑 |
安装条件 |
基本单元和扩展单元是否安装牢固 基本单元和扩展单元的联接电缆是否完全插好 接线螺钉是否松动 外部接线是否损坏 |
安装螺钉必须上紧 联接电缆不能松动 联接螺钉不能松动 外部接线不能有任何外观异常 |
使用寿命 |
1.锂电池电压是否降低 2.继电器输出触点 |
1.工作5年左右 2.寿命300万次(35V以上) |
AYDIN CONTROLS 4605647501AL , 91230591 , 362041080 , FSD-002 400-5647-002
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