RELANCE 0-60028-2  静态跳闸模块

随着DCS在大型火电厂的普遍应用，如何确定DCS检修内容、检修周期及维修项目才能保证DCS在火电厂应用条件下安全运行，是提高其可靠性的关键。实际应用中，应充分利用计算机系统自诊断功能，及早发现异常情况，防止模件故障;检修时也要有合理的检修工艺和程序，兼顾DCS本身检修和重视控制系统外部设备的检修，并要根据DCS系统特性列出检修注意事项，做好一定的防护措施，以避免DCS装置模件在检修中受到损害。

调节阀仪表气源压力低或仪表空气全部断气

　　当发现多个自调系统失灵，监控画面上自调阀阀位在全开或全关位置，立即检查仪表气源压力，若气源压力小于0．4MPa，则不正常，检查气源管道有无堵塞或 漏气现象；若气源压力小于0．2MPa，立即进行紧急停车。将监控画面上的自调系统全部打到手动，将调节阀阀位调到安全位置，通知仪表工检查气源，同时到 现场进行操作，关闭调节阀两端的截止阀，用旁路阀操作。

结 论

　　DCS发生故障时，操作工应掌握一定的判别方法，及早发现问题，进行适当处理，可以避免或者减少对工艺控制的影响。

In the control group screen, manual and automatic switching is not possible, or after manually inputting data, once confirmed, it returns to the original data and cannot be modified.

(3) In the trend chart screen, several trends remain unchanged as straight lines.

(4) In the monitoring screen, multiple data fluctuate significantly at the same time.

View data from the monitoring screen

When the following situations occur, it indicates that there is a problem with the control system. The microcomputer maintenance personnel should be notified immediately for repair, and the operator should come to the site for handling.

Frequently changing data remains unchanged for a long time, and several or all data remain unchanged.

DCS system fault diagnosis and handling methods: With the improvement of automation level, DCS control system (distributed control system) has gradually replaced conventional instruments, and its superiority has been accepted by a large number of operators. But when a malfunction occurs, it can cause the device to shut down or even cause accidents. It is very important to detect and handle various faults early and appropriately. Our company's synthetic ammonia process uses multiple sets of Zhejiang University Central Control JX-300XDCS for control, which is stable and reliable. Based on years of maintenance experience, we have summarized an effective set of fault identification and handling methods to address some of the existing problems.