產品內容介紹
FOXBORO 731CA-35終端顯示控制器
操作和維護計劃操作和維護計劃有助于確保功能安全可以在系統(tǒng)調試后進行維護。
在役人員操作和維護通常不屬于系統(tǒng)集成商可以提供指導和使用確保負責的人員或組織操作和維護可以使系統(tǒng)按規(guī)定運行安全級別。
操作和維護計劃必須包括以下項目：
?清楚定義通電和斷電順序。這些定義必須確保序列不會導致結果存在危險時系統(tǒng)無法安全運行的時期。
?重新校準傳感器和致動器的程序。這個必須包括建議的校準周期。
?定期頻繁測試系統(tǒng)的程序，以及測試之間最大間隔的定義。
?用于維護的覆蓋定義傳感器和執(zhí)行器。
?維護系統(tǒng)安全的程序。輸入模塊校準操作和維護計劃必須包括以下建議：測量控制器輸入模塊的校準。
必須每隔兩次測量每個模擬輸入模塊的校準年；
每個數字輸入模塊的校準必須每五次測量一次年。
計劃維護在大多數系統(tǒng)配置中，有些元件未經測試通過系統(tǒng)的內部診斷-例如，最終被動元件輸入/輸出模塊、傳感器和執(zhí)行器本身以及現(xiàn)場接線。
必須規(guī)定計劃維護測試的制度，以確保任何可能最終導致系統(tǒng)無法完成其安全功能，不要堆積。這些測試之間的最大間隔必須在安裝之前指定。強烈建議進行測試間隔小于用于計算PFD值的驗證測試間隔。
現(xiàn)場設備維護操作和維護計劃必須包括現(xiàn)場維護活動，如現(xiàn)場設備的重新校準、測試和更換。通常，這些措施的充分規(guī)定將由客戶只要必要的維護覆蓋和其他設施實施后，無需其他安全要求。
強烈建議在現(xiàn)場設備期間不要使用I/O強制維護。當AADvance控制器使用雙冗余或三冗余模塊時，處理模塊故障配置，如果其中一個發(fā)生故障，控制器可以繼續(xù)運行它的模塊。但是，當模塊確實存在故障時，必須將其更換為安全手冊中推薦（所有模塊都允許帶電拆卸和冗余配置中的更換），以確保故障不會累積，多重故障條件不會導致電廠關機。
除了更換保險絲外，不支持現(xiàn)場維修一些終端組件。必須退回所有故障模塊進行維修或根據保修和退貨政策進行故障診斷隨系統(tǒng)提供的文檔。
Operation and Maintenance Plan
An Operation and Maintenance Plan helps to make sure that functional safety can be maintained after the commissioning of the system. The in-service operation and maintenance is normally outside the responsibility of the system integrator, but the system integrator can give guidance and use procedures to make sure that the persons or organizations accountable for operation and maintenance can keep the system operating to the specified safety levels. The Operating and Maintenance Plan must include the following items: ? Clear definitions of power up and power down sequences. These definitions must make sure that the sequences never cause resulting periods when the system cannot operate safely when a hazard is present. ? The procedures for re calibrating sensors and actuators. The recommended calibration periods must be included. ? The procedures for frequently testing the system at regular intervals, together with definitions of the maximum intervals between testing. ? Definitions of the overrides to be applied to be able to do maintenance to the sensors and actuators. ? The procedures for maintaining system security.
Input Module Calibration
The Operation and Maintenance Plan must include recommendations to measure the calibration of controller input modules. The calibration of each analogue input module must be measured every two years; the calibration of each digital input module must be measured every five years. Planned Maintenance In most system configurations there will be some elements that are not tested by the system's internal diagnostics — for example, the final passive elements in I/O modules, the sensors and actuators themselves, and the field wiring. A regime of planned maintenance testing must be specified to make sure that any faults, which could ultimately cause the system's inability to fulfill its safety functions, do not build up. The maximum interval between these tests must be specified before installation. It is highly recommended the test interval be less than the Proof Test Interval used to calculate the PFD values. Field Device Maintenance The Operation and Maintenance Plan must include field maintenance activities, such as re-calibration, testing and replacement of field devices.In general, sufficient provision for these measures will be specified by the client. As long as the necessary maintenance overrides and other facilities are implemented, no other safety requirements will be necessary. It is highly recommended the I/O forcing is NOT used during field device maintenance.
Handling Module Faults
When the AADvance controller uses modules in a dual or triple redundant configuration, the controller can continue to operate if a fault occurs on one of its modules. However, when a module does have a fault it must be replaced as recommended in the Safety Manual (all modules permit live removal and replacement in redundant configurations) to make sure that faults do not accumulate and that multiple failure conditions do not cause a plant shutdown. On-site repair is not supported apart from for the replacement of fuses in some termination assemblies. All failed modules must be returned for repair or fault diagnosis in accordance with the warranty and return policy documentation delivered with your system.
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