升級(jí)部分是預(yù)壓設(shè)備。在升級(jí)之前的問題如下：使用工頻驅(qū)動(dòng)的預(yù)壓設(shè)備，由于固定頻率和速度，會(huì)導(dǎo)致較低的糖分萃取率，并且壓榨機(jī)很容易就會(huì)被卡住。升級(jí)后，采用變頻驅(qū)動(dòng)控制。
詳細(xì)參數(shù)列表如下：
表1 預(yù)壓電機(jī)參數(shù)
圖3 現(xiàn)場加載和設(shè)備
3.系統(tǒng)配置
據(jù)在現(xiàn)場需求，預(yù)壓變頻驅(qū)動(dòng)器由變壓器柜，供電設(shè)備柜和控制柜組成。控制柜面板上設(shè)有本地/遠(yuǎn)程按鈕、緊急停止按鈕和電源頻率/變頻指示燈。
變頻驅(qū)動(dòng)器采用英威騰GD5000逆變器。通過遠(yuǎn)程控制臺(tái)可以監(jiān)控系統(tǒng)狀態(tài)和壓榨機(jī)速度，操作人員在控制室就可以很便利地根據(jù)生產(chǎn)需求來調(diào)整壓榨機(jī)運(yùn)行速度，而且為提高生產(chǎn)效率提供了極大的優(yōu)勢(shì)。
圖4 現(xiàn)場應(yīng)用
4.應(yīng)用和優(yōu)勢(shì)
升級(jí)之后，優(yōu)點(diǎn)如下，
1. 軟啟動(dòng)，啟動(dòng)時(shí)間和啟動(dòng)方法可以根據(jù)現(xiàn)場情況進(jìn)行調(diào)整。
2. 更高的功率因數(shù)。0.95以上，無需使用功率因數(shù)補(bǔ)償裝置，并且更加精煉。
3. 對(duì)電機(jī)無諧波污染，有效地降低了電機(jī)的熱量。
4. 非常低的轉(zhuǎn)矩脈沖，不會(huì)造成電機(jī)和其它機(jī)械設(shè)備之間的共振，并降低傳輸?shù)臋C(jī)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(jī)卡住或停機(jī)的現(xiàn)象。同時(shí)提高經(jīng)濟(jì)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
