Loop status monitoring

Xia, C. and Howell, J. (2002) Loop status monitoring. In: IEE Seminar on Control Loop Performance Monitoring, London, 26 Nov 2002, (doi: 10.1049/ic:20020223)

Abstract

Loop status monitoring involves the declaration of deterministic trends, such as oscillations and drifting, in process plant control loops. Certain aspects will be of interest to the operator, whilst others will be of more interest to the control/maintenance engineer, who might be interested in investigating an incident whilst it is occurring on the plant. Some might be of use when analysing data off-line. The benefit is as much to do with providing information about plant operation, as with understanding the performance of an individual control loop. Loop status monitoring and fault localisation based on a comparison of overall loop performance indices has proved to be successful and robust by both simulation and real industrial data analysis. This comparison can point out the problem loop, and loop status information helps one to narrow down the possible root cause. Although the approach has been developed for PI/PID controllers, it should be equally applicable for those controllers that have a frequency dependent statistic, which is the ratio of the signal to noise ratios of the controlled variable and controller output. Some relevant references are given below.

• Item Type: Conference Proceedings
• Keywords: Control
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: Howell, Dr John
• Authors: Xia, C., and Howell, J.
• Subjects: T Technology > TS Manufactures
• College/School: College of Science and Engineering > School of Engineering > Systems Power and Energy