FOXBORO 0399071D 0303440C+0303443B模擬量輸入模塊DEH升速過程采用主汽門(TV)控制，當升速到2950 r／min時，切換閥門，由主汽門控制切換為高壓調(diào)門(GV)控制，后定速3000 r／min。
常規(guī)的閥切換經(jīng)常由于TV與GV的開起和關閉速率配合不好而造成的汽機轉(zhuǎn)速波動很大[1]，為此，通過改進閥切換控制方案：閥切換開始時，開高調(diào)門系數(shù)由1逐漸變?yōu)?，并且轉(zhuǎn)速PID同時作用于TV和GV，即：
GV閥位輸出＝開高調(diào)門系數(shù)×100＋（1－開高調(diào)門系數(shù)）×閥位給定（轉(zhuǎn)速PID輸出）
TV閥位輸出＝（1－開高調(diào)門系數(shù)）×100＋開高調(diào)門系數(shù)×閥位給定（轉(zhuǎn)速PID輸出）
采用新的閥切換控制方案后，在機組的各次起動中，汽輪機轉(zhuǎn)速在DEH進行閥門切換過程中非常穩(wěn)定，轉(zhuǎn)速波動不超過5 r／min，滿足了DEH 汽輪機轉(zhuǎn)速控制的要求。
雙冗余LVDT低選功能設計
LVDT雙通道高選位置反饋方式，若兩個LVDT同時斷線，則油動機將全開，因此不滿足伺服系統(tǒng)安全設計原則。因此將原LVDT斷線檢測判斷后，拉低LVDT解調(diào)后的直流電壓，改為拉高LVDT直流電壓；將原LVDT直流電壓高選電路，改為低選電路，這樣若單個LVDT斷線，該LVDT直流電壓大于閥位指令電壓，由于采用低選電路，將不影響伺服系統(tǒng)的正常工作。若兩個LVDT均斷線，LVDT直流電壓大于閥位指令電壓，油動機將全關。這樣修改后可同時滿足安全和冗余設計原則。The DEH speed raising process is controlled by the main throttle valve (TV). When the speed rises to 2950 r/min, the valve will be switched. The main throttle valve control will be switched to the high pressure control valve (GV) control, and the final speed will be fixed at 3000 r/min.
Conventional valve switching often results in large turbine speed fluctuation due to poor matching of TV and GV opening and closing rates [1]. Therefore, the control scheme of valve switching is improved: at the beginning of valve switching, the opening high regulating valve coefficient gradually changes from 1 to 0, and the speed PID acts on TV and GV simultaneously, namely:
GV valve position output=open high regulating valve coefficient × 100 ＋ (1 － coefficient of opening high regulating valve) × Valve position setting (speed PID output)
TV valve position output=(1 - coefficient of opening high regulating valve) × 100+coefficient of opening high regulating valve × Valve position setting (speed PID output)
After adopting the new valve switching control scheme, during each startup of the unit, the turbine speed is very stable during the valve switching process of DEH, and the speed fluctuation does not exceed 5 r/min, meeting the requirements of DEH turbine speed control.
Design of dual redundancy LVDT low selection function
LVDT dual channel high selection position feedback mode, if two LVDTs are disconnected at the same time, the hydraulic servo motor will be fully opened, so it does not meet the safety design principle of the servo system. Therefore, after the original LVDT disconnection detection and judgment, the DC voltage after LVDT demodulation is pulled down and the DC voltage of LVDT is pulled up; The original LVDT DC voltage high selection circuit is changed to a low selection circuit, so that if a single LVDT is disconnected, the LVDT DC voltage is greater than the valve position command voltage. Since the low selection circuit is used, the normal operation of the servo system will not be affected. If both LVDTs are disconnected, and the LVDT DC voltage is greater than the valve position command voltage, the hydraulic servo motor will be fully closed. In this way, both safety and redundancy design principles can be met after modification
主營產(chǎn)品簡介
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●使用前:

在操作和維護，安裝設備之前，請閱讀并嚴格遵守安全相關的信息。

Read and strictly follow safety-related information before operatingmaintainingand installing equipment.

●使用者要求:

必須從事安裝，組裝或維護設備等相關工控電氣機械以及其他相關技術的人員。

Must be engaged in the installation,assembly or maintenance of equipment and other related industriacontroeectrica machinery and other related technica personne.應用范圍:

應用于品牌本系列工業(yè)以及生產(chǎn)生活自動化設備產(chǎn)品。

Used in the brand of this series of industriaand production automation eauipment products

適用于場景:系統(tǒng)集成，非標定制，產(chǎn)線升級改造，原設備電氣替換等等。

Suitable for scenarios:system integration,non-standard customizationproduction line upgrading and transformation,electrical replacement of original equipment,etc.

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應該由本品牌專業(yè)培訓操作員來安裝、操作和維修設備。專業(yè)人員具有技術能力強，熟悉安全信息和安全實施:

熟悉設備的安裝加工、操作和維護:熟悉處理所有的潛在危險情況。

Equipment should be installed,operated and maintained by trained operators from the brand

●危險情況

警告

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Study the product instruction manual thoroughlyotherwise it may cause personal danger to non-professionals.

●服務行業(yè)

適用水泥，木業(yè)，石業(yè)，橡膠，石油，化工，發(fā)電，環(huán)保，水處理，制冷，交通，鋼鐵，食品，飲料，船舶，制冷等行業(yè)

Applicable to cementwood,stone,rubber,petroleumchemical, power generation