DAPC100 3ASC25H203 ABB Industrial Control Accessories System Module

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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.
9) After the system is powered on, the communication connectors should not collide with conductive bodies such as cabinets, and redundant communication lines and connectors should not collide with each other to avoid burning out the communication network card.
2. Preventive maintenance

　　Proactively maintain the system and components in a planned manner to ensure stable and reliable operation, a good operating environment, and timely detection and replacement of components to eliminate hidden dangers. Preventive maintenance should be carried out annually through major repairs to grasp the operating status of the system and eliminate potential faults. During the overhaul period, the DCS system should be thoroughly 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 ground resistance testing.
4) On site equipment maintenance. The specific method can refer to the relevant equipment manual. The person in charge of system maintenance after major repairs should confirm that the conditions are met before powering on, and strictly follow the powering on steps.



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After a system failure, passive maintenance should be carried out, mainly including the following tasks:
1) Professional maintenance generally requires manufacturers or designated maintenance engineers to carry out maintenance.
2) The general maintenance of the system is carried out by users themselves. Maintenance personnel should have a certain understanding of the technical difficulty and operability of system maintenance, understand the necessary maintenance tools, clarify which tasks can be completed on their own, and have a clear understanding. If problems arise, feasible maintenance plans should be formulated in a timely manner. The key to maintaining DCS system faults is to quickly and accurately determine the location of the fault point. Some experiences in fault maintenance can be summarized as follows:
(1) DCS systems often have rich self diagnostic functions. Based on the alarm, the fault point can be directly identified, and the maintenance results can also be verified by eliminating the alarm.
(2) Poor contact of communication connectors can cause communication faults. After confirming poor contact of communication connectors, tools can be used to redo the connectors; If the communication line is damaged, it should be replaced in a timely manner.
(3) The flashing fault light of a certain card or all data on the card being zero may be due to incorrect configuration information, the card being in a standby state with redundant terminal connection wires not connected, the card itself malfunctioning, or the lack of configuration information in that slot.
(4) When a certain production status is abnormal or an alarm occurs, we can first find the instrument that reflects this status, and then use the instrument to check the correctness of the signal one by one along the direction of signal transmission until the fault is identified.
(5) When a large-scale hardware failure occurs, it is most likely due to poor maintenance of the DCS system environment, resulting in system operation failure. In addition to emergency spare parts replacement and system cleaning work, it is also necessary to contact the manufacturer in a timely manner, and have the manufacturer's professional technical support engineer further confirm and eliminate the fault. 4. Conclusion: For the maintenance work of DCS system, the key is to achieve prevention. As system maintenance personnel, they should develop scientific, reasonable, and feasible maintenance strategies and methods based on system configuration and production equipment control, achieve close coordination between preventive maintenance and daily maintenance, and carry out systematic, planned, and regular maintenance to ensure that the system operates well in the required environment for a long time, ensuring smooth and stable production process control and operation, To provide reliable guarantees for achieving production and efficiency goals.