升级部分是预压设备。在升级之前的问题如下：使用工频驱动的预压设备，由于固定频率和速度，会导致较低的糖分萃取率，并且压榨机很容易就会被卡住。升级后，采用变频驱动控制。
详细参数列表如下：
表1 预压电机参数
图3 现场加载和设备
3.系统配置
据在现场需求，预压变频驱动器由变压器柜，供电设备柜和控制柜组成。控制柜面板上设有本地/远程按钮、紧急停止按钮和电源频率/变频指示灯。
变频驱动器采用英威腾GD5000逆变器。通过远程控制台可以监控系统状态和压榨机速度，操作人员在控制室就可以很便利地根据生产需求来调整压榨机运行速度，而且为提高生产效率提供了极大的优势。
图4 现场应用
4.应用和优势
升级之后，优点如下，
1. 软启动，启动时间和启动方法可以根据现场情况进行调整。
2. 更高的功率因数。0.95以上，无需使用功率因数补偿装置，并且更加精炼。
3. 对电机无谐波污染，有效地降低了电机的热量。
4. 非常低的转矩脉冲，不会造成电机和其它机械设备之间的共振，并降低传输的机械磨损。
5. 完美的输出波形，失真度小于4％。
6. 减少由于蔗层太厚造成压榨机卡住或停机的现象。同时提高经济效益。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
