DCS systems have high flexibility and scalability. Equipped with advanced process operation screens (dynamic process screen, grouped circuit screen, overall picture, alarm screen, trend recording screen, etc.), it has various control functions, calculation functions, and can achieve process parameter trend prediction, historical data display, and various alarm functions. Thus achieving centralized monitoring, control, and management of the entire process of process production. At the same time, various modules of the DCS system can be hot swapped, which are not available in conventional instruments or require complex combinations to achieve.+
DCS daily maintenance
DCS maintenance is somewhat mysterious for production enterprises such as chemical plants, steel plants, metallurgical plants, and power plants. No matter how small or urgent an issue with DCS may be, it can only be handled by a few people upon arrival.
In the minds of instrument maintenance personnel, DCS maintenance is a lofty and sacred profession. So what are the contents of daily DCS maintenance?
The maintenance of DCS can be divided into: daily maintenance; Preventive maintenance and fault maintenance, daily maintenance and preventive maintenance are maintenance carried out when the system has not malfunctioned. Fault maintenance occurs after a fault occurs, often resulting in partial system failure and adverse effects on production; On the contrary, preventive maintenance is a planned and regular maintenance of the system during normal operation, in order to timely grasp the operating status of the system, eliminate system failure hazards, ensure long-term stable and reliable operation of the system, and form the concept of regular maintenance. Practice has proven that regular maintenance can effectively prevent the occurrence of sudden DCS failures and generate considerable indirect economic benefits.
Daily maintenance of DCS system
The daily maintenance of the system is the foundation for the stable and efficient operation of the DCS system, and the main maintenance work includes the following points:
1) Improve the DCS system management system.
2) Ensure the stable operation of the air conditioning equipment, ensure that the temperature change is less than ± 5 ℃/h, and avoid condensation on the system equipment due to rapid changes in temperature and humidity.
3) Try to avoid interference from electromagnetic fields on the system, avoid moving operating stations, displays, etc. during operation, and avoid pulling or damaging equipment connection cables and communication cables.
4) Pay attention to dust prevention, properly isolate the site from the control room, and regularly clean and maintain cleanliness to prevent adverse effects of dust on component operation and heat dissipation;
5) It is strictly prohibited to use non genuine software and install software unrelated to the system.
6) Make a backup of the control subdirectory files, and record system data such as PID parameters of each control circuit and the positive and negative effects of the regulator.
7) Check if the control host, monitor, mouse, keyboard, and other hardware are intact, and if real-time monitoring is working properly.
8) Check the fault diagnosis screen for any fault prompts.
Preventive maintenance
Plan proactive and preventive maintenance to ensure stable and reliable system operation. According to the overhaul cycle, preventive maintenance should be carried out using the overhaul to grasp the operating status of the system and eliminate potential faults. During the overhaul period, the DCS system should be thoroughly and comprehensively maintained, including:
1) System redundancy testing: Conduct redundancy testing on redundant power supplies, servers, controllers, and communication networks. Power outage maintenance for operation and control stations. Dust cleaning of components such as computer interiors, control station cages, and power boxes.
2) System power supply line maintenance. And conduct power supply capacity testing and discharge operations on UPS.
3) Grounding system maintenance. Including terminal inspection and grounding resistance testing.