In a steel process line, shape controller of steel strip which use an electromagnet are important devices which improve strip quality and line speed. It is confirmed that the devices are beneficial when these are applied to continuous galvanizing line (CGL). However, it is necessary to avoid a static instability phenomenon by the negative spring of the electromagnet, and a spill-over phenomenon to be caused by the high gain of the control system in this device. We proposed the analysis model combining the control system with the steel strip. The model was applied to a real machine to confirm the availabilities. Moreover, this paper discusses the static instability phenomenon and the spill-over phenomenon.
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