The system first rectifies the 600V AC power of the grid into 750V DC through the thyristor, filters the capacitor, and then uses the insulated gate bipolar transistor IGBT to complete the inverter process to obtain 600V, frequency 50-60Hz adjustable frequency AC power, to achieve the drilling rig drawworks, turntable mud The speed control and torque control of the pump and Song Zuan motor realize stepless speed regulation and meet the transmission requirements.

The system adopts the "zero speed and large torque frequency conversion control technology" independently developed by Hande, and the controller is equipped with "speed adaptive full-order observer control algorithm". Use "one-to-one" control scheme (ZJ70DB) or turntable winch switching scheme (ZJ40DB).

The PLC system uses PROFIBUS fieldbus communication to realize the control, monitoring and fault judgment of the system. The relay can also be used for emergency operation, and the control signal can be transmitted through the multi-core cable.