RELANCE 0-57210-31 控制器
0-57210-31 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(yīng)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。0-57210-31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。0-57210-31 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(luò)？
A：1、用網(wǎng)絡(luò)測試儀測試網(wǎng)線硬件是否正常，檢查交換機指示燈是否正常。 2、檢查監(jiān)控“故障診斷”畫面是否有故障提示。 3、對每臺計算機使用“ping”命令檢查網(wǎng)絡(luò)是否正常，IP設(shè)置是否正確。 4、檢查網(wǎng)卡流控制是否關(guān)閉，網(wǎng)卡驅(qū)動安裝是否正常。 5、使用組態(tài)軟件自帶SCDIAGNOSE軟件檢測網(wǎng)絡(luò)情況。 Q7：DCS系統(tǒng)維護如何做好防靜電？ A：如果維護不注意，靜電可能對DCS卡件或通訊帶來不小影響，DCS維護過程中特別是在觸碰硬件卡件或通訊部件時應(yīng)采取如下措施做好防靜電。 1、保持環(huán)境有一定的濕度。特別北方地區(qū)或在干燥的冬季，因靜電產(chǎn)生故障的事例要遠遠大于在東南沿海地區(qū)或其他季節(jié)，所以在一些重要場所，如計算機機房、實驗室、電子儀器的裝調(diào)車間應(yīng)考慮保持一定濕度的問題，特別是對那些封閉形的空調(diào)房間，更應(yīng)有一定控制濕度的設(shè)備。 2、鋪設(shè)防靜電地板，控制室和操作室均需鋪設(shè)防靜電地板。 3、在維護插扒卡件時或用手拿捏卡件時一定注意先對手釋放靜電，注意盡量避免用手直接觸碰卡件電子元件、面板電路和焊點。 4、卡件應(yīng)存放在防靜電塑料盛放器或防靜電塑料袋中，并存放在卡件盒中。 5、系統(tǒng)維護時還應(yīng)注意佩帶DCS防靜電手腕。
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.