RELANCE 57C332A 接口模塊
DCS系統(tǒng)的接地示意圖 57421 DCS接地是一個很復雜的問題，涉及到接地地點，接地方式，接地電阻大小等從現(xiàn)場到DCS機柜的諸多節(jié)點和環(huán)節(jié)。但日常對DCS的常規(guī)檢查主要有幾個方面： 1、DCS機柜應采用單點接地方式，檢查是否有可能導致多點接地的地方出現(xiàn)，比如機柜與槽鋼的接觸，接地點是否為單條引下線（線徑大于16mm2，長度小于30米）到地樁或地網(wǎng)，部件連接（或焊接）點是否良好（銹蝕）等。57421 檢查DCS接地點與電氣地或避雷針引下線接地是否共用，距離是否符合要求，一般情況要求DCS接地與電氣地距離15米以上，與避雷針接地點15米以上。57421 測量DCS系統(tǒng)接地電阻是否小于4歐姆。接地電阻的大小與很多因素相關(guān)，如接觸良好，土壤濕度，導電率等，測量接地電阻可選用的儀器有搖表、鉗形表等。 Q6：日常維護時如何檢查DCS系統(tǒng)網(wǎng)絡？
根據(jù)計算機控制設備特點，DCS除像常規(guī)控制設備一樣進行外圍設備檢修外，隨機組大小修至少要進行以下項目的檢修，即模件組態(tài)拷貝，核實控制模件標志和地址;清掃電源、模件及防塵濾網(wǎng)，檢查緊固控制柜接線，進行接地系統(tǒng)檢查，冷卻風扇檢修，電源設備檢修測試;重要測量和保護信號線路絕緣檢查;電子室溫度、濕度及含塵量檢修前測試，檢修后復查;模件電源及冗余模件的切換試驗;報警及保護功能測試;通信、手動操作站檢查;進行卡進行校驗等;檢修前要做好充分的準備工作，檢修中要嚴格執(zhí)行工序卡制度，并認真做好檢修記錄，對電源、模件等測試要仔細填寫測試報告。
Use a network tester to test whether the network cable hardware is working properly and check if the switch indicator lights are working properly. 2. Check if there are any fault prompts on the monitoring "fault diagnosis" screen. 3. Use the "ping" command on each computer to check if the network is functioning properly and if the IP settings are correct. 4. Check if the network card flow control is turned off and if the network card driver installation is normal. 5. Use the built-in SCDIAGNOSE software in the configuration software to detect network conditions. Q7: How to do a good job of anti-static in DCS system maintenance? A: If maintenance is not done carefully, static electricity may have a significant impact on DCS cards or communication. During DCS maintenance, especially when touching hardware cards or communication components, the following measures should be taken to prevent static electricity. 1. Maintain a certain level of humidity in the environment. In particularly northern regions or in dry winter, the occurrence of malfunctions caused by static electricity is much greater than in southeastern coastal areas or other seasons.
Use a network tester to test whether the network cable hardware is working properly and check if the switch indicator lights are working properly. 2. Check if there are any fault prompts on the monitoring "fault diagnosis" screen. 3. Use the "ping" command on each computer to check if the network is functioning properly and if the IP settings are correct. 4. Check if the network card flow control is turned off and if the network card driver installation is normal. 5. Use the built-in SCDIAGNOSE software in the configuration software to detect network conditions. Q7: How to do a good job of anti-static in DCS system maintenance? A: If maintenance is not done carefully, static electricity may have a significant impact on DCS cards or communication. During DCS maintenance, especially when touching hardware cards or communication components, the following measures should be taken to prevent static electricity. 1. Maintain a certain level of humidity in the environment. In particularly northern regions or in dry winter, the occurrence of malfunctions caused by static electricity is much greater than in southeastern coastal areas or other seasons.
Grounding diagram A of DCS system: DCS grounding is a very complex problem, involving many nodes and links from the site to the DCS cabinet, such as grounding point, grounding method, and grounding resistance. However, there are several aspects to the routine inspection of DCS in daily life: 1. The DCS cabinet should adopt a single point grounding method to check whether there is a possibility of multiple grounding points, such as the contact between the cabinet and the channel steel, whether the grounding point is a single down lead (with a diameter greater than 16mm2 and a length less than 30 meters) to the ground pile or grid, and whether the connection (or welding) points of the components are good (corroded). 2. Check if the DCS grounding point is shared with the electrical or lightning rod grounding point, and if the distance meets the requirements. Generally, it is required that the DCS grounding point be at least 15 meters away from the electrical grounding point and at least 15 meters away from the lightning rod grounding point. 3. Measure if the grounding resistance of the DCS system is less than 4 ohms. The size of grounding resistance is related to many factors, such as good contact, soil moisture, conductivity, etc. The instruments available for measuring grounding resistance include shake meters, clamp meters, etc. Q6: How to check the DCS system network during daily maintenance.