正确连接ABB Symphony DCS系统PFI信号的重要性

PFI是一个ABB Symphony DCS控制系统为保护运行设备不被损坏而设置的使控制模件中断运行的保护信号,在实际运行中,由于电源监视模块本身故障引起控制模件停止运行的故障时有发生,因而ABB公司为此发函取消了该保护信号。然而在取消了电源PFI信号后,控制模件的PFI信号要是连接不当,也会使控制模件发生意想不到的故障。经过实验室的大量试验,还原了几个案例中当时的故障现象,本文再对ABB Symphony DCS系统的电源PFI信号进行了详细地分析,让大家对ABB DCS系统的电源PFI信号有一个新的认识,正确连接PFI信号尤为重要。     

提高ABB MASTER系统运行效率的措施分析

本文从福建南纸TMP生产工艺流程、控制系统配置等方面介绍了ABB MASTER系统在生产过程控制的应用。并针对系统故障分布图，介绍了为提高ABB MASTER系统运行效率应增强系统的抗干扰性能，及采取预防和处理故障的措施。     

SP700扫描架水分测量系统的故障分析及处理办法

介绍了ABB公司Accuray1190 QCS质量控制系统的水分头在运行当中出现的问题和解决办法。     

ABB机器人浇铸工作站的设计和应用

根据ABB机器人的功能需求和特点,设计了具有良好通用性的工业机器人浇铸控制系统的软硬件结构。以六轴机器人为应用实例,并根据实际生产的需求,通过西门子PLC与ABB机器人的信号交互控制。实际应用结果表明,该浇铸工作站有效的提高了浇铸生产效率,并且运行稳定可靠。     

基于ABB PLC的桥式抓斗卸船机实训平台设计

桥式抓斗卸船机是一种典型的煤炭、矿石装卸机械,对卸船工作效率起着至关重要的作用。卸船机的操作和维修是港机、港电等专业学生必须掌握的实践技能,但是由于体积巨大、价格昂贵等原因,在校内很难建立有效的实训室。本设计在保持基本结构不变的基础上将实际的桥式抓斗卸船机按比例缩小模型化,手柄、按钮等操作装置与实际桥式抓斗卸船机基本一致,电气控制系统采用ABB的AC500 PM582 PLC、ACS355变频器、CP430触摸屏以及MODBUS现场总线。通过该实训平台,学生能够更加有效的掌握操作维修桥式抓斗卸船机的实践技能。     

Yield,characteristics and composition of banana juice extracted by the enzymatic and mechanical methods

A comparative study of the enzymatic and mechanical banana juice extraction methods and the respective juices produced was carried out using Kayinja bananas (ABB genotype) imported from Uganda. In the enzymatic extraction process, macerated ripe banana pulp was incubated with a commercial enzyme preparation (Pectinex Ultra SP‐L) at 50 °C for 2 h. In the mechanical extraction process the ripe banana pulp was mixed with stretched strips of polythene and worked with a dough mixer at room temperature for 20 min (on average) until the juice appeared. Significantly (p < 0.05) higher ‘pure’ juice yield (604 g kg^?1 pulp) was obtained with the enzymatic method than with the mechanical method (541 g kg^?1 pulp). However, adding water to the spent pulp from the mechanical process and extracting dilute juice improved the juice yield to 757 g kg^?1 pulp. The enzyme‐extracted juice had significantly (p < 0.05) higher soluble solids, titratable acidity, fructose, glucose, total nitrogen, density and mineral potassium. However, the mechanically extracted juice had significantly higher sucrose, pH and viscosity. Although the mechanical extraction process suffers from occasional juice extraction failures, it offers an opportunity to extract banana juice without excessive energy expenditure, and the juice produced is wholesome with a superior flavour to that produced by the enzymatic method. © 2002 Society of Chemical Industry     

Fermentation optimization for a probiotic local northeastern Indian rice beer and application to local cassava and plantain beer production

Response surface methodology was employed to determine the optimal conditions of time and temperature for the fermentation of a local North East Indian rice beer. The same conditions were then applied to prepare local beers from cassava (Manihot esculanta) and plantain (Musa ABB). Saccharomyces cerevisiae, Aspergillus oryzae and Lactobacillus plantarum were used to carry out the fermentation process. Thirteen experimental runs, based on a two‐factor five‐level design were carried out according to a central composite rotatable design. The independent variables were fermentation time (24–216 h) and temperature (25–40°C). The responses studied were content of protein, alcohol, total polyphenols, reducing sugars as well as titratable acidity and L. plantarum count. Numerical optimization predicted that a fermentation period of 143 h at a temperature of 33°C would result in a desirable rice beer, with response values of protein content OF 0.77%, alcohol content OF 6.99%, L. plantarum count of 7.08 log CFU mL^?1, polyphenol content of 34.46 mg/100 g, reducing sugars of 2.39% and a titratable acidity of 0.34%. Cassava and plantain beers were prepared using the optimized parameters of the rice beer experiments and the resultant beers exhibited the desired chemical parameters, suggesting applicability of the conditions to preparing these types of local beers from a wider range of substrates. Copyright © 2015 The Institute of Brewing & Distilling     

Profibus与FF总线技术应用比较

本文对于Profibus PA和Foundation Fieldbus进行了多个层面的比较分析,通过美国知名工程公司执行的某个项目中控制系统采用ABB公司AC 800x A总线技术的总结,从应用层面探讨了Profibus总线技术在化工工业领域更具有经济性的结论。     

复合控制系统在卸船机中的应用

由于各大电厂和码头的设备逐渐进入老化期,各个器件的备件越来越少,当系统出现故障后,可能导致由于备件不足引起的系统崩溃。因此复合控制系统应时而生,既满足对控制系统稳定性的要求,又保证了各元器件的备件生命周期。着重介绍了西门子PLC和ABB直流变频器的复合控制系统在卸船机中的应用。     

智能照明系统ABB i-bus总线系统的运用

结合工程实例阐述了智能照明系统ABBi bus总线系统的技术特点以及在实际中的应用。