To illustrate the requirements of spring steel wire heat treatment production line on take-up and its electric system.The electric control principle was illustrated.The speed setting basis of traction machine and take-up was given.The electric control system consists of human-computer interface,PLC and frequency transformer.Process parameter setting and display was finished by human-computer interface,which operated conveniently.SIEMENS PLC is the key of control,the running frequency of traction machine is ...