4GN3KA現貨
性能:
MCD 3000 軟起動開關是一種電子的、固態(tài)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(tǒng),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(jiān)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(jiān)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(qū)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(jié)
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
1. 制定設備運行方案
制定方案就是根據生產工藝的要求,分析各輸入、輸出與各種操作之間的邏輯關系,確定需要檢測的量和控制的方法,并設計出系統(tǒng)中各設備的操作內容和操作順序。據此便可畫出流程圖。
2. 畫控制流程圖
對于較復雜的應用系統(tǒng),需要繪制系統(tǒng)控制流程圖,用以清楚地表明動作的順序和條件。對于簡單的控制系統(tǒng),可省去這一步。
3. 制定系統(tǒng)的抗干擾措施
根據現場工作環(huán)境、干擾源的性質等因素,綜合制定系統(tǒng)的硬件和軟件抗干擾措施,如硬件上的電源隔離、信號濾波,軟件上的平均值濾波等。
4. 編寫程序
根據被控對象的輸入輸出信號及所選定的PLC型號分配PLC的硬件資源,為梯形圖的各種繼電器或接點進行編號,再按照軟件規(guī)格說明書(技術要求、編制依據、測試),用梯形圖進行編程。
5. 軟件測試
剛編寫好的程序難免有缺陷或錯誤。為了及時發(fā)現和消除程序中的錯誤和缺陷,需要對程序進行離線測試。經調試、排錯、修改及模擬運行后,才能正式投入運行。
6. 編制程序使用說明書
當一項軟件工程完成后,為了便于用戶和現場調試人員的使用,應對所編制的程序進行說明,說明書應包括程序設計的依據、結構、功能、流程圖,各項功能單元的分析,PLC的IO信號,軟件程序操作使用的步驟、注意事項等。
PLC應用系統(tǒng)設計實例
機械手控制系統(tǒng)設計
1. 工藝過程及控制要求
1) 工藝過程
圖6.1所示為一簡易物料搬運機械手的工藝流程圖。該機械手是一個水平垂直位移的機械設備,其操作是將工件從左工作臺搬運到右工作臺,由光耦合器VLC來檢測工作臺上有沒有工件。機械手通常位于原點,它的動作全部由氣缸驅動,而氣缸則由相應的電磁閥控制。其中,上升下降和左移右移分別由雙線圈二位電磁閥控制,放松夾緊由一個單線圈二位電磁閥(稱為夾緊電磁閥)控制。
2) 控制要求
機械手整個搬運過程要求都能自動控制。在啟動過程中能切換到手動控制及自動控制或半自動控制(又稱單周期控制),以便對設備進行調整和檢修。圖6.2是機械手控制系統(tǒng)的邏輯流程圖。系統(tǒng)啟動之前,機械手處于原始位置,條件是機械手在高位﹑左位。
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