LOGO!在变频器控制中的应用

介绍了西门子公司的通用逻辑模块LOGO !的功能和特点 ,以及LOGO !在变频器控制中的应用。     

基于LOGO!的折弯机控制系统设计

介绍采用通用逻辑控制模块LOGO!在折弯机控制系统中应用的实例.对折弯机系统、工作原理、控制过程及软硬件设计进行了全面的分析.为实现对折弯机高效、安全和可靠的控制,采用SIEMENS公司推出的LOGO!作为折弯机控制系统核心,对折弯机进行自动控制.实践证明:采用LOGO!作为控制核心,工作可靠、操作简单、便于维护,并提高了控制的柔性和功能的可拓展性.     

基于可编程通用逻辑模块LOGO！的控制过滤装置

本文讨论LOGO!的特点和过滤装置的原理及控制方式,并重点介绍了LOGO!在过滤装置中的应用     

LOGO!在全自动甩干机的应用

以LOGO!作为主要控制单元设计了全自动甩干机的电气控制系统,以相对较少的资源和相对低廉的成本实现了较为复杂的工艺控制过程。同时,借助LOGO!强大的离线和在线仿真功能,极大地缩短了设备的调试时间。LOGO!可靠、易用且经济,但是由于其本身的市场定位,可用的功能块数量很少,所以使用LOGO!时,难度不在于工艺过程如何实现,而在于如何巧妙地用最少的功能块来完成程序控制。     

多功能天车对位加料系统LOGO!控制设计

介绍了多功能天车对位加料系统的工作原理和逻辑控制器LOGO!.着重叙述了逻辑控制器LOGO!实现多功能天车对位加料系统的自动化控制方法,并给出了该系统的硬件组成和软件设计.     

LOGO!在照明控制中的应用

LOGO!是SIEMENS公司推出的一种可编程逻辑控制器,它能替代一组传统的继电器,如定时器、计数器、时钟等,而且具有RS闭锁继电器、脉冲继电器等功能.使用者利用面板上的6个按键将所用电气线路编程输入LOGO!中并在液晶显示屏显示,用集成的内部软件替代过去大量的外部硬接线,从而大大减少了安装费用.LOGO!总线型设有智能AS-I接口,可与PLC等上一级控制器交换过程信号、状态或控制信息.它与通用的PLC相比具有编程简单、参数显示和设置方便、输出能力大等优点.但在编程时值得注意的是,LOGO!的嵌套深度只有9个功能块(包括输入、输出),如若超出,LOGO!将无法运行.下面介绍有关LOGO!应用在照明控制方面的2个例子.     

基于可编程序通用逻辑模块的剪板机控制

对剪板机的结构、工作原理及控制特点进行了全面的分析.为实现对剪板机高效、安全和可靠的自动控制,采用SIEMENS公司推出的通用逻辑控制模块LOGO!作为系统主机,对剪板机进行自动控制.该逻辑控制模块简化了控制系统的硬件电路,提高了控制的柔性和功能的可拓展性.运行分析证明,LOGO!控制系统工作可靠,操作简单,能有效地对剪扳机设备进行控制.     

LOGO!在照明系统控制中的应用

LOGO!是SIEMENS公司推出的一种可编程逻辑控制器,它能替代一组传统的继电器。LOGO!总线型设有智能AS-I接口,可与PLC等上一级控制器交换过程信号、状态或控制信息。它与通用的PLC相比具有编程简单、参数显示和设置方便、输出能力大等优点。但在编程时值得注意的是,LOGO!的嵌套深度只有9个功能块(包括输入、输出),如若超出,LOGO!将无法运行。     

LOGO!控制器在电传动石油钻机MCC软启动上的应用

LOGO!是一种小型通用逻辑控制器,其主要特点有体积小、功能强、易于操作、性价比高等。在小型机械设备、电气装置、控制柜以及安装工程等多种领域应用非常广泛。介绍LOGO!在电传动石油钻机MCC软启动上的应用,并结合一拖四软启动控制的具体实例对LOGO!控制器的应用进行了说明。     

LOGO！在液位控制中的应用

新型的超小型可编程序控制器产品LOGO！也叫可编程通用逻辑控制模块。它与以往的PLC相比有以下优点: (1)编程更简单。LOGO！编程是将各种功能块组合连接起来以实现所需的功能。不像PLC编程,必须掌握其编程语言和内部地址分配的情况。     

大跨越导线测振及监测技术研究

微风振动是造成架空线路导、地线疲劳断股的主要原因之一,严重威胁着大跨越导线的安全运行。根据IEC TC7、CIGRE/IEEE推荐的自阻尼测试方法以及IEEE给出的架空线振动测量的基础理论,结合大量的试验性研究,详细分析了大跨越导线的室内测振技术以及室外监测技术,提出了切实可行的室内消振试验方法以及适用于国内市场需求的现场监测仪器。     

Technologies for the Comprehensive Exploitation of the Geothermal Resources of the North Caucasus Region

Technology for the integrated development of low-temperature geothermal resources using the thermal and water potentials for various purposes is proposed. The heat of the thermal waters is utilized in a low-temperature district heating system and for heating the water in a hot water supply system. The water cooled in heat exchangers enters a chemical treatment system where it is conditioned into potable water quality and then forwarded to the household and potable water supply system. Efficient technologies for removal of arsenic and organic contaminants from the water have been developed. For the uninterrupted supply of the consumers with power, the technologies that use two and more types of renewable energy sources (RESs) have the best prospects. Technology for processing organic waste using the geothermal energy has been proposed. According to this technology, the geothermal water is divided into two flows, one of which is delivered to a biomass conversion system and the other is directed to a geothermal steam-gas power plant (GSGP). The wastewater arrives at the pump station from which it is pumped back into the bed. Upon drying, the biogas from the conversion system is delivered into the combustion chamber of a gas-turbine plant (GTP). The heat of the turbine exhaust gases is used in the GSGP to evaporate and reheat the low-boiling working medium. The working medium is heated in the GSGP to the evaporation temperature using the heat of the thermal water. High-temperature geothermal brines are the most promising for the comprehensive processing. According to the proposed technology, the heat energy of the brines is utilized to generate the electric power at a binary geothermal power station; the electric power is then used to extract the dissolved chemical components from the rest of the brine. The comprehensive utilization of high-temperature brines of the East-Precaucasian Artesian Basin will allow to completely satisfy the demand of Russia for lithium carbonate and sodium chloride.     

The value of the grid and the role of the utility in managing it

Distributed energy resources and electrification are countervailing trends in the electricity business. DER challenges the traditional electric utility business model, while electrification presents new opportunities for the economy, for the environment, and for utilities. Both of these new developments highlight the importance of the electric grid, and the critical need for utilities to manage this integrated grid of the future.     

SVPWM调制下逆变器输出电压谐波分析

逆变器输出电压的谐波引起交流电动机的转矩脉动和附加发热,具有严重危害,研究逆变器输出电压的谐波特征可以为寻找减小谐波的方法提供基础.基于SVPWM调制方法,推导出了逆变器输出电压解析表达式.通过对电压方程进行傅里叶分解的方式,讨论了步进频率、调制电压幅值、输出电压周期对谐波的影响.分析表明,步进频率变化对总电压谐波畸变...     

Preventing the Self-Destruction of the Indirect Coal Firing System

The most widely used fuel in the cement industry is pulverized coal. The current trend is to burn coal through the use of an indirect firing system, as opposed to direct firing which was formerly standard for cement kilns. Indirect firing is favored for precalciners and to improve thermal efficiency, but the benefits are sometimes overshadowed by increased hazard potential. Thoughtful design and careful operating practices are essential for safe operation. The hazards are primarily a result of the explosive mixture of coal and air which can be formed in various parts of the system and the tendency for coal to self-heat and undergo spontaneous combustion. The systems for indirect coal firing are reviewed, with emphasis on the potential fire and explosion hazards. The effectiveness of various methods to extinguish a fire or suppress an explosion is discussed, together with their applicability and related operating problems. The available alarm systems are evaluated according to their ability to signal impending danger in time for corrective action. Some parameters of safe design and operating practices are outlined as a guide to avoiding the types of problems that have been experienced at some existing installations.     

影响工程竣工决算报表准确性因素的研究

工程竣工决算报表是全面综合地反映竣工项目建设成果及财务情况的总结性文件.分析了影响工程竣工决算报表准确性的工程设计与工程实施两方面因素的各种具体体现.并针对这些问题提出了解决措施.     

AGC系统电厂侧有功功率变送器接线改进

通过对AGC运行模式、AGC控制系统配置方法及AGC取值逻辑的技术分析,剖析了现有AGC电厂侧有功功率变送器接线方式的缺陷和存在的安全隐患,同时提出了AGC电厂侧有功功率变送器接线方式的改进方法。以达到在运行中安全、快速更换变送器的目的,从而实现智能电网要求的“自愈”功能。     

电工用铜线的性能和提高铜线质量的对策

2006年我国的铜导体用量已达到354万t,其中电磁线用铜已接近100万t,约占整个电线电缆行业用铜总量的28%,在电缆行业中,对铜线质量要求最高的也是铜电磁线,特别是微细和超微细漆包线,而且还有柔软性的特殊要求。影响铜线质量的链是很长的,从原材料铜的冶炼、制杆、制线、退火(包括拉线退火和漆包退火);合理选材、按铜杆质量分等使用;加强铜杆进出厂检验、铜线生产过程中间检验、采用特殊的可退火性检验方法,以及制订电线电缆行业的铜杆标准和采购规范等都是提高铜线质量的有效对策。     

Health monitoring in the home of the future

We discuss health monitoring as a potential application field for wearable sensors. We present some usage models for health monitoring and discuss the technical requirements for the health-monitoring system based on wearable and ambient sensors, which measure health-related data in daily environments of the users or patients. The presentation is by no means complete, but it aims to give an idea of the system-level issues to be considered for real applications. The technology in this area is rapidly developing, and without doubt we will evidence emergence of these applications in the coming years in the market.     

Multifunctional Gripper Design at the End of the Robot

For the current robotic grasping scenario, the market for single gripper grippers to grasp items is limited, ex-pensive, difficult to use, after-sales cumbersome, and other problems. This paper designs a multi-functional gripper, integrating electro-pneumatic functions and designing multi-functional flanges, which can be used for all kinds of robots and multi-angle mounting, and designs multiple suction cups on the basis of the electric gripper to solve the problem that some items cannot be grasped, and designs various finger grippers at the end of the gripper to solve the problem of grasping items of different shapes. In this paper, the jaws are analyzed using the ANSYS Workbench for static simulations and also tested for gripping stability with a dozen terms. The versatile gripper has the advantages of compact design, reliable grip, easy maintenance, high-cost performance, and multi-scene use.