Reduction of Electrical Noise in Computer and Control Installations in Steel Mills: I--IV

ELECTRICAL noise! You cannot hear it but, without proper system design, it can sadly affect the performance and reliability of sophisticated steel mill control systems. Some of these have been placed in service with virtually no difficulty; other systems, however, have been very troublesome, requiring extensive rework, and never quite achieving the degree of performance promised by theory or laboratory tests of the equipment. The spurious signals introduced by noise can cause weird and intermittent effects that are very difficult to resolve. The proper approach, in the first place, is to avoid noise by equipment design and installation techniques which either make the system resistant to noise or reduce the noise sources themselves.