Abstract : This paper introduces the constant tension control principle of the spool take-up in a welding wire copper plating production line. The law that the torque of the take-up motor increases proportionally with the increase of the coil diameter is derived. An Emerson frequency converter with torque control function is used to drive the spool take-up, simplifying the tension control system and improving the efficiency of subsequent operations. The parameter setting and debugging process are also explained. Keywords : take-up machine; tension control; frequency converter [b][align=center]Application of Transducer to Take-up of Welding Wire Cu-plating Line Du Chunyu Li Wutian Han Dapeng (Zhengzhou Machine Research Institute 450052)[/align][/b ] Adopting the Emerson transducer with rotation moment control function to drive spool take-up simplifies the tension control system and improves the efficiency of follow-up work. The parameter setting and adjusting process is explained. Keywords : take-up; tension control; transducer In the copper plating production line for welding wire, the I-beam take-up is the last process. As the welding wire is wound, the diameter of the I-beam gradually increases. Maintaining constant tension at all times is crucial, as this significantly affects the warp of the finished welding wire. 1. Principle of Constant Tension Take-up [b][align=center]For more details, please click: Application of Frequency Converter in Copper Plating Welding Wire Take-up Machine[/align][/b]