PLC站控系统温度跳变引起联锁故障的分析及处理
2021-09-03乙加牛樊荣
乙加牛 樊荣


[摘 要 ] PLC站控系统在运行过程中发生温度值异常跳变升高,触发了联锁停泵现象。经过分析,得出联锁触发原因,是由于温度异常跳变,造成联锁停机。常规方法是更换信号跳变的元件。此次故障解决通过分析PLC模块原理,在不更换硬件的情况下,通过修改组态软件采集寄存器地址,设置组态软件量程与温度对应关系,解决了温度跳变引起的联锁故障。
[关键词]温度;异常跳变;联锁
[中图分类号]TE973.8 [文献标志码]A [文章编号]2095–6487(2021)06–0–02
[Abstract]During the operation of the PLC station control system, an abnormal jump of temperature occurred, which triggered the phenomenon of interlocking pump shutdown. After analysis, it is concluded that the reason for the interlock triggering is due to the abnormal temperature jump, which causes the interlock to stop. The conventional method is to replace the signal jumper component. The troubleshooting this time is through analyzing the principle of the PLC module, without changing the hardware, by modifying the configuration software to collect the register address, setting the configuration software range and the temperature correspondence, and solving the interlocking failure caused by the temperature jump.
[Keywords]temperature; abnormal jump; interlock
新疆克拉玛依油田公司某转油站,对油田来液进行分离、加热、后到压力缓冲罐,经3台75 kW转油泵增压后,原油外输到联合站。配有一套专门的小型PLC站控系统,2台监控电脑监控所有参数,1台在站内就地监控,另一台在联合站进行远程监控。由于转油泵功率较大,为了防止意外故障造成泵电机烧毁,现场电机及泵体部位安装有温度、震动传感器,实现联锁停泵保护。当电机温度及泵体振动达到联锁设定值时,自动停泵保护。
站库系统上位机监控软件采用的是ESIPIDER7.0,力控ForceControl V7.0 OEM版。下位机硬件组态ESET2018软件,该软件可对北硬件产品进行通信、采集、PID等参数配置及寄存器调试操作。联锁编程采用OPENPCS2008软件。
1 故障现象
值班员工反馈,转油泵偶有自动停泵现象,具体原因未知,已经多次发生,当联锁停泵后,停一段时间后又可以重新启泵。由于原油输送不能中断,不排查出自动停泵原因,一旦停泵后不能及时发现,有可能会造成管线憋压破裂、原油泄漏的生产事故,产生安全环保风险,给企业带来经济损失。……
