Rexroth 0 608 830 160現貨
性能:
MCD 3000 軟起動開關是一種電子的、固態的、全波軟啟動控制器。它通過控制啟動電流,為驅動設備的傳動裝置提供平滑、可控的加速和減速控制性能。尤其對于那些不希望超過額定值起動的應用系統,MCD 3000 軟起動開關可以減少拖動機械的振蕩,限制電動機的大受熱。有21種型號可供選擇,額定功率范圍7.5 - 800KW 。
特性:
1、可選特性 :
為密封電纜終端而留出的多余空間
并列安裝(高達到 160 kW)
所有 MCD 3000 軟起動開關都可以獨立工作。本地控制面板提供起動/制動操作和本地/遠距離操作的選擇。
LED 顯示器顯示電流值,或者計算的電動機熱負載占電動機熱容量的百分比。
基于內部潛流監控的保護,防止水泵抽干
預備的旁路電流接觸器可以在全速運行時將負載轉移到線路上。即使在旁路電流接觸器關閉的情況下,MCD 3000 軟起動開關仍然可以為電動機提供保護和電流監控。
安全銷保護,防止異物造成破壞
相序保護,確保水泵不會反轉
直流制動,如果需要的話,可以提供可控的快速減速。
鍵盤區類似于 VLT 變頻器的面板
2、保護特性:
可編程控制的電動機熱容量
過電壓和欠電壓保護
輸入相丟失保護和敏感性調節
過流保護
瞬時過載故障點
額外的啟動時間保護
瞬時保護
可調的重新啟動延遲,防止電動機短路
附件:
自動-變壓器
金屬密封板
一個指針給出的是變量的地址,而不是變量的數值大小。在有些功能塊中,可能使用指針編程更為方便。用定義指針類型的形參,就能在功能塊中先使用一個虛設的指針,待調用功能塊時再為其賦予確定的地址。當為指針參數類型形參分配實參時,需要指明內存地址,例如P#M50.0。
3. 塊調用過程及內存分配
CPU提供塊堆棧(B堆棧)來存儲與處理被中斷塊的有關信息。當發生塊調用或有來自更高優先級的中斷時,就有相關的塊信息存儲在B堆棧里,并影響部分內存和寄存器。圖5.2顯示了調用塊時B堆棧與L堆棧的變化。圖5.3提供了關于STEP 7的塊調用情況。
1) B堆棧與L堆棧
B堆棧是CPU系統內存中的一部分,它存儲以下被中斷塊的數據:
(1) 塊號、塊類型、優先級、被中斷塊的返回地址;
(2) 塊寄存器DB、DI被中斷前的內容;
(3) 臨時變量的指針(被中斷塊的L堆棧地址)。
STEP 7中可使用的B堆棧大小是有限制的,對于S7-300 CPU,則可在B堆棧中存儲8個塊的信息。因此,塊調用嵌套深度也是有限制的,多可同時激活8個塊。
L堆棧是CPU內存中的一部分,它在塊調用時被重新分配。L堆棧用來存儲邏輯塊中定義的臨時變量,也分配給臨時本地數據使用。梯形圖的方塊指令與標準功能塊也可能使用L堆棧存儲運算的中間結果。
2) 調用功能塊FB
當調用功能塊FB時,會有以下事件發生:
(1) 調用塊的地址和返回位置存儲在塊堆棧中,調用塊的臨時變量壓入L堆棧;
(2) 數據塊DB寄存器內容與DI寄存器內容交換;
(3) 新的數據塊地址裝入DI寄存器;
(4) 被調用塊的實參裝入DB和L堆棧上部;
(5) 當功能塊FB結束時,先前塊的現場信息從塊堆棧中彈出,臨時變量彈出L堆棧;
(6) DB和DI寄存器內容交換。
當調用功能塊FB時,STEP 7并不一定要求給FB形參賦予實參,除非參數是復式數據類型的IO形參或參數類型形參。如果沒有給FB形參賦予實參,則功能塊FB就調用背景數據塊內的數值。該數值是在功能塊的變量聲明表內或背景數據塊內設置的形參初始數值。
3) 調用功能塊FC
當調用功能塊FC時會有以下事件發生:
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Rexroth 0 608 830 160
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