... period is 12 months within 3, the speed-adjustable equipment 4,1.5 ~ 1000kW 380VEnergy-saving system for oil extractor1,380V Single-unit 2 ... ,The warrantee period is 12 months within3, the speed-adjustable equipment 4,1 ... the fluctuant torque load of conveyor belt and ball mill. Energy saving system speed-adjustable equipment