... becoming more and more popular in speed control coal motor equipments. 2.Product Advantages l With small starting currentl ... as winch, conveyor, scrape plane, coal feeder, fans, pumps and oil pumps. 4.Technical Parameters Rated input featureAC 380V, AC 660V, ... relay outputDisplayDisplay screenSetting frequency, output frequency, current, power, motor speed, load rate, input and output torque, etc.Fault ...