【Daily Question 20090406】Precautions for cleaning cabinets
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After being in use for a period of time, DCS or PLC cabinets will accumulate some dust to varying degrees. If not cleaned regularly, this will certainly affect the cabinets’ heat dissipation and insulation properties, leading to various unexpected problems. Please share the steps and precautions involved in cleaning the cabinets, and exchange ideas with each other. It would be best to specify the manufacturer and model of the cabinets, as well as the quantity; the preparations made for cleaning and the time it took to carry out the cleaning; and whether any problems arose during their use. The more detailed the answer, the more points you’ll get! Plagiarism is strictly prohibited; severe penalties will be imposed on violators!
There are two stages to cleaning the system cabinet: the first is cleaning during the operation of the equipment, which is usually done using a vacuum cleaner; it is important to take measures to prevent static electricity from interfering with the components. Secondly, during the maintenance period, conduct inspections by thoroughly cleaning all types of cards inside the cabinet in accordance with the cleaning procedures provided by the control system manufacturer. I don’t have the operating procedures here for now, but I should be able to find them; if I do, I’ll bring them over.
All types of cards inside the cabinet are thoroughly cleaned in accordance with the cleaning procedures provided by the control system manufacturer
The DCS systems most commonly used in our petrochemical industry are CENTUM CS-3000, while GE’s PLCs are employed. Cabinet cleaning is one of the tasks carried out during maintenance, and the specific steps are as follows: 1. Shut down the facility, issue a work order for the process, and assign supervisors； 2. The instrument maintenance staff shall perform the latest database backup of the system and prepare all necessary system software ； 3. Prepare various tools: large cloth, electronic cleaner, hair dryer, screwdriver, wrench, pliers, and so on ； 4. Check the system status; once verification is complete, shut down the system and cut off power to the respective circuits ； 5. Console cleaning: The computer connection cables must be disconnected, the main unit’s chassis opened for dust removal, the exterior cleaned thoroughly, and both the inside and outside of the console cleaned; also check that all connectors are secure ； 6. Cabinet cleaning: Label the card holders according to the layout code; after labeling each cable accordingly, remove the card holders, clean the entire cabinet, check the appearance of the card holders, the batteries, etc., keep a record of everything, reinstall the card holders, reconnect the cables, and inspect the communication connectors; if any are loose, tighten them or replace them ； 7. Conduct a thorough inspection: ensure that the cards are in place, the cables are correct, connections are secure, and there are no extra components; after verifying each item, sign and submit a report ； 8. Restart the system following the startup procedures, check whether the power supply is functioning properly, whether there are any abnormalities in the operation of the indicator lights, verify that the switch is working correctly, check if communication is functioning properly, and ensure that the computer peripherals are operating normally, etc ； 9. Check the system configuration details and circuit checks, verifying each one individually ； 10. Organize a joint inspection and acceptance of processes, equipment, and instruments; upon confirmation, it is completed.
In the thermoelectric industry, equipment must be cleaned during periods of downtime for major repairs; in particular, the main controller FM811 requires the controller to be removed from the control cabinet and cleaned using a air gun, with special attention being paid to replacing the fan during this process. When reinstalling the control cabinet, pay special attention to being careful when plugging and unplugging the DP connectors to ensure full contact. During the period without stops, cleaning and replacement of wear parts are carried out in case of problems