RELANCE 10V4160 用作穩(wěn)壓板
投用時(shí)，應(yīng)該對模件地址和其他開關(guān)設(shè)定，并監(jiān)護(hù)人確認(rèn)后，方可插入正確的模位，并填寫記錄卡。 4、定期檢查 應(yīng)每半年對工廠庫房保存的各種少量DCS系統(tǒng)常用備件進(jìn)行檢查，檢查內(nèi)容如下： 1）表面清潔、印刷板插件無油漬，印刷板插件無油漬，輕微敲擊后無異常。 2）軟件裝卸試驗(yàn)正常，通信口、手操站工作正常。 3）各種模擬量、開關(guān)量輸入、輸出通道工作正常。 4）裝入測試軟件，正常工作不少于48h以上。 5）冗余模件的切換試驗(yàn)。 6）檢查后應(yīng)填寫檢查記錄，并粘上合格標(biāo)志。
在DCS系統(tǒng)的使用過程中，對于DCS備件的管理工作是很重要的，DL/T774-2001《火力發(fā)電廠分散控制系統(tǒng)運(yùn)行檢修導(dǎo)則》中提出了對于DCS備件管理的要求，正確管理DCS備件涉及存放要求、定期檢查、使用前準(zhǔn)備、使用時(shí)等四個(gè)方面內(nèi)容，具體要求如下： 1、存放要求 DCS系統(tǒng)備用模件存放應(yīng)滿足的要求為：各種模件必須用防靜電袋包裝后存放或根據(jù)制造廠的要求存放，模件存貯室的溫度、濕度也應(yīng)滿足制造廠的要求；存取模件時(shí)應(yīng)采取防靜電措施，禁止任何時(shí)候用手觸摸電路板，并且進(jìn)行登記，辦理進(jìn)、出庫手續(xù)。 2、用前準(zhǔn)備 運(yùn)行前必須檢查各通信口、I/O功能、控制算法功能是否滿足要求；在工程師站上對模件狀態(tài)進(jìn)行檢查符合要求；在模件內(nèi)裝入組態(tài)，檢查是否正確。
According to the characteristics of computer control equipment, in addition to peripheral equipment maintenance like conventional control equipment, DCS random group size maintenance should at least carry out the following items of maintenance: copy of module configuration, verification of control module flags and addresses; Clean the power supply, modules, and dust filter, check and tighten the wiring of the control cabinet, conduct grounding system inspection, cooling fan maintenance, and power equipment maintenance and testing; Insulation inspection of important measurement and protection signal lines; Test the temperature, humidity, and dust content of the electronic room before maintenance, and recheck it after maintenance; Switching test of module power supply and redundant modules; Alarm and protection function testing; Inspection of communication and manual operation stations; Perform card verification, etc; Before maintenance, sufficient preparation work should be done. During maintenance, the process card system should be strictly followed, and maintenance records should be carefully kept. Test reports for power supplies, modules, and other components should be carefully filled out.
With the widespread application of DCS in large thermal power plants, determining the maintenance content, maintenance cycle, and maintenance items of DCS is the key to ensuring its safe operation under the application conditions of thermal power plants and improving its reliability. In practical applications, the self diagnosis function of computer systems should be fully utilized to detect abnormal situations early and prevent module failures; During maintenance, there should also be a reasonable maintenance process and procedure, taking into account the maintenance of DCS itself and the importance of external equipment maintenance of the control system. Maintenance precautions should be listed according to the characteristics of the DCS system, and certain protective measures should be taken to avoid damage to the DCS device modules during maintenance.
The pressure of the regulating valve instrument air source is low or all instrument air is cut off
When multiple self regulating systems are found to be malfunctioning and the self regulating valve position on the monitoring screen is in the fully open or fully closed position, immediately check the instrument air source pressure. If the air source pressure is less than 0.4MPa, it is abnormal. Check whether the air source pipeline is blocked or leaking; If the gas source pressure is less than 0.2MPa, immediately perform an emergency stop. Turn all the self adjustment systems on the monitoring screen to manual mode, adjust the valve position of the regulating valve to a safe position, notify the instrument worker to check the air source, and at the same time, go to the site for operation. Close the shut-off valves at both ends of the regulating valve and operate it with a bypass valve.