... -unit 2,18 ~ 1000kW 3,The warrantee period is 12 months within 4,the motor frequency adopting PID regulating t ... for oil extractor1,380V Single-unit 2,18 ~ 1000kW3,The warrantee period is 12 months within4,Energy-saving system designed ... regulating theory, it was developed to satisfy the operating requirement of the production line by achieving the energy saving effect. Variable frequency energy ...