The family of MICROMASTER frequency inverters address drive applications in the power range extending from 0.12 kW up to 250 kW. From simple applications with voltage-frequency control (V/f control) or complex applications with closed-loop vector control and encoder feedback. (Quoted from SIEMENS www introduction: 2008)
MM420 use : Conveyor systems, material transport, pumps, fans, mechanical engineering. MM430 use : Specially suitable for pumps and fans MM440 use : material handling systems, the textile industry, elevators, hoisting gear, mechanical engineering and the food, beverages and tobacco industries.