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■擺頻     擺頻應用于紗線繞線設備,例如細紗機等,用于錐形紗錠生產工藝,典型工作頻率-時間圖如圖1。某些國外設備稱擺頻為橫頻。有些場合擺頻也稱為三角波,因為它的工作頻率-時間圖為三角波。為了防止紗線在錐體兩端重疊,在紗線繞到紗錠兩端時,工藝上需要運行頻率突跳幾Hz,所以此時的擺頻工作頻率-時間圖如圖2。 圖1 擺頻運行時的三角波圖形 圖2 擺頻運行時的防疊紗三角波圖形■定長/定徑     紡織行業中,紗錠需要有統一的規格,固定的長度,布匹要有固定的米數,為了實現定長控制,引入脈沖編碼計數,或使用與紗線、布匹長度相關的模擬量對紗錠、布匹長度/直徑進行控制,實現定長功能,長度到達設定值后,通過指示燈提示或選擇定長/定徑自動停機。 ■恒線速度閉環控制紡織模式     使用脈沖反饋測速輥紡紗時,在紡紗開始時,紗錠直徑較小,與測速輥接觸不太平穩,需要先將紗錠紡到一定大小后,再切入脈沖反饋閉環(或模擬反饋閉環)運行,進行恒線速度控制。在閉環之前的紡紗過程,隨著紗錠變大,運行頻率需要減小。使用遞減功能可以滿足這一階段工藝要求。恒線速度閉環控制紡織模式(遞減+恒線速度)如圖3所示。 反饋斷線保護:當脈沖反饋信號長期缺失時,為防止飛車,設定無反饋信號檢測時間,時間到達后立即停車,此停車不會執行爬行功能,以保證及時性。 圖3 恒線速度閉環控制紡織模式 ■爬行定位     爬行定位功能是手動停機或當有斷紗、纏繞或滿紗信號后,變頻器自動停機時,變頻器不直接停機到零頻,而是先在某一設定的低速頻率運行一段時間,收到定位信號后才真正停機的功能。如圖4所示。 該功能可用于自動化生產中,滿紗信號發出后,實現自動換卷及紗錠放置工...
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