The unwinding frequency converter and two winding frequency converters work in the open-loop torque mode to control the system discharging and the up and down receiving after cutting.

The host inverter uses the Huichuan universal inverter MD500 to control the running speed of the scutter. It works in the open loop vector mode, and the main speed is generally adjusted by the potentiometer. The AO1 port is used as the output of the running frequency and is given as the line speed of the unwinding converter and the upper and lower winding converter.

The unwinding frequency converter and the winding frequency converter use the Huichuan MD330 tension special frequency converter, all of which work in the open-loop torque mode. Huichuan MD330 inverter is a frequency converter that can realize constant tension control. The real-time coil diameter can be obtained through the calculation of the internal frequency converter, and the constant tension control can be obtained by controlling the output torque of the frequency converter.