升級部分是預壓設備。在升級之前的問題如下：使用工頻驅動的預壓設備，由于固定頻率和速度，會導致較低的糖分萃取率，并且壓榨機很容易就會被卡住。升級后，采用變頻驅動控制。
詳細參數列表如下：
表1 預壓電機參數
圖3 現場加載和設備
3.系統配置
據在現場需求，預壓變頻驅動器由變壓器柜，供電設備柜和控制柜組成。控制柜面板上設有本地/遠程按鈕、緊急停止按鈕和電源頻率/變頻指示燈。
變頻驅動器采用英威騰GD5000逆變器。通過遠程控制臺可以監控系統狀態和壓榨機速度，操作人員在控制室就可以很便利地根據生產需求來調整壓榨機運行速度，而且為提高生產效率提供了極大的優勢。
圖4 現場應用
4.應用和優勢
升級之后，優點如下，
1. 軟啟動，啟動時間和啟動方法可以根據現場情況進行調整。
2. 更高的功率因數。0.95以上，無需使用功率因數補償裝置，并且更加精煉。
3. 對電機無諧波污染，有效地降低了電機的熱量。
4. 非常低的轉矩脈沖，不會造成電機和其它機械設備之間的共振，并降低傳輸的機械磨損。
5. 完美的輸出波形，失真度小于4％。
6. 減少由于蔗層太厚造成壓榨機卡住或停機的現象。同時提高經濟效益。shape, such as candy, biscuits and so on. Due to the fierce competition, low price and small profit margin, most of the small pillow packaging machines in South China use single-chip microcomputer control in order to control the cost, but there are some problems in using single-chip microcomputer, such as interference and inconvenient to modify the program. Panasonic Electric Co., Ltd. of Japan has a small PLC with low price and fast operation speed, which is favored by many manufacturers. However, due to the increasing foreign trade transactions in China, especially in Europe, they have not recognized the products in Japan and South Korea enough in the past two years. Therefore, these manufacturers can only choose the products in Europe and America. That is such an opportunity. Siemens Small PLC has begun its initial use on pillow packaging machine. However, there are some problems in the process of use. This paper mainly discusses the problems and solutions encountered in the debugging process.
1 project introduction
The most important and difficult part of the pillow type double frequency conversion food
