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3故障处理

3.1现场检查

值班员在操作站翻阅各工艺系统画面后，大致对设备故障点有了初步的了解，进入电子间对DCS系统的卡件进行检查，发现PCU13柜内1对冗余主模件BRC400故障指示灯亮，控制器处于离线状态，该机柜内所有IO卡件显示异常。查阅机柜内相关资料，掌握了该控制单元所涉及的现场设备（装置90%的温度、压力、液位、流量等AI测点，送风系统32台二次风执行器AO测点）

3.2相关措施

在此紧急时刻，直接、有效的方法是对控制器进行插拔或按复位按钮，看控制器能否正常运行。因主控制器上电或复位时，程序要进行初始化，这对AI测点无影响，但AO测点的控制信号要回零，这样现场执行器等就会动作，影响装置的平稳、生产。在5时50分开具事故抢险单，做好相关措施（对所涉及的执行器等设备停电或打1手动，确保控制器重新上电或复位后设备保持原位）后，对BRC400主模件进行插拔操作，2分钟左右主控制器恢复正常，其下属的IO卡件也恢复正常。经运行人员再进行操作验证，确保故障完全排除。

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