The plan to select the type of frequency speed regulator according to the collected electrical data and the condition of the site is introduced, the actual application of it in the cam control in steel rolling mill and the problems in operation are discussed, the resolving plan proposed.

By Changing the over-model heavy girder of the turnover machine from the linear contact into point contact as well as by revamping the original point of no return,control circuit,cam controller and hydraulic oil line system the low utilization rate of the machine due to return of part of the charging material and increase of production cost are effectively solved.