DR300A series inverter is a simple, high-performance inverter with two control methods: V / F and vector control without speed sensor. It can also realize open loop torque control. The adjustment function is easy to operate and superior in performance. Especially in the speed sensorless vector control mode, low frequency torque, stable speed accuracy and dynamic characteristics are excellent. Widely used in machine tools, wire drawing machines, injection molding machines, lifting machinery, printing machinery and other fields.