This paper presents a portable condition monitoring system named MAPREX which was
developed as result of the cooperation between the University of Oviedo and Aceralia
inside of a research project funded by the ECSC - Steel RTD Program. The system integrates
powerful monitoring and data visualization techniques based on the Self Organizing Map
(SOM) algorithm. In this paper is described in detail the system architecture
and performances, visualization techniques implemented and an example displaying real
data from a 6,000 kW DC motor of a hot strip mill rolling stand.