Design of Electrical Control System for 4500KN TDS

The conventional top-drive system (TDS) decelerates and increases torque through a gearbox to meet the requirements of drilling operations. To further improve transmission efficiency and reliability, a TDS’s direct drive technology that directly drives the spindle with a variable frequency motor will become a development trend. The direct-drive technology connects the motor directly to the load, achieving direct drive of the load, simplifying the intermediate transmission link, shortening the transmission chain, and improving transmission efficiency. In response to the requirements of 4500 KN top drive drilling, a direct-drive TDS that is directly driven by a variable frequency motor to drive the spindle has been developed, and an advanced electrical control system based on S7-1200PLC has been designed. This system not only allows for direct drive control of the drilling rig, but also facilitates multi-mode automatic drilling, soft torque control of the drill string and soft pump control. The experiment shows that the electronic control system runs reliably, is easy to operate and has a high degree of intelligence, fully meeting the drilling needs of various drilling conditions on land and in the ocean.