CYLINDER CAPACITY MANAGEMENT SYSTEM FOR A LOPPING HEAD

The present invention relates to a system for driving a movable element， comprising at least one drive device (A， B) comprising: - a main motor (M11， M12) configured to be connected to the first supply line (10); - a multi-cylinder capacity secondary motor (M21， M22) configured to be connected to the second supply line (12) and comprising two half-motors (V1， V2) corresponding to two cylinder capacity levels (V1， V1+V2)， wherein the first half-motor (V1) is coupled in series with the main motor (M11， M12) via a series line (L10A， L10B); - a vacuum valve (20A， 20B) controlled using a control line (25A， 25B) and configured to activate or deactivate the second half-motor (V2); - an additional supply line (L11A， L11B) configured to be connected to the first supply line (10) and connected to the second half-motor (V2)， wherein the vacuum valve (20A， 20B， 20) is also controlled using a feedback control opposing the control by the control line (25A， 25B)， said feedback control being implemented by a feedback control line (27A， 27B， 27) drawing from the additional supply line (L11， L11B， L11).