Cost-efficient retro-fitting of an existing extrusion or compounding line calls for well-thought modifications to the control technology. The maax® 3 automation system developed by maag is directly integrated into the frequency converter of the pump. It is the ideal solution for retrofitting extrusion lines with gear pumps in a cost-efficient manner. Operation, control and regulation are simplified. This guarantees an optimum protection and operation of the gear pump. The process and operation reliability of the entire plant are increased.