Method and facility for positioning an element of a machine

A system for positioning an element of a machine, comprising:

• a first generator to generate a setpoint position variable such that the element is slowed down with a predetermined deceleration, wherein the element is a part of a plastic machine or a press;
• a second generator to generate a limit variable, wherein the limit variable is a force-limiting variable or a pressure-limiting variable, wherein a limit controller limits a force or pressure value, wherein the setpoint position variable is reduced based upon the limit variable to form a modified setpoint position variable, and wherein the modified setpoint position is forwarded as a setpoint variable to a controller for positioning the element;
• an extrapolation unit:
• an expected setpoint position variable based upon the modified setpoint position variable;
• wherein the expected setpoint position is generated by the extrapolation unit;
• a braking distance of the element based upon the expected setpoint position variable;
• and
• an initiator for a braking process of the element to initiate the braking process, when the braking distance corresponds to a target location reduced by the expected setpoint position variable, wherein the element stops at the required target location.

A method for positioning an element of a plastic machine, comprising:

• providing the plastic machine performing the method;
• generating a setpoint position variable by a reference variable generation unit such that the element of the plastic machine is slowed down with a predetermined deceleration;
• reducing the setpoint position variable based upon a pressure-limiting variable controlled by a limit controller, wherein a modified setpoint position variable is formed;
• forwarding the modified setpoint position as a setpoint variable to a controller for positioning the element;
• determining an expected setpoint position variable based upon the modified setpoint position variable using an extrapolation;
• determining a braking distance of the element based upon the expected setpoint position variable;
• and
• initiating a braking process of the element, when the braking distance corresponds to a target location reduced by the expected setpoint position variable, wherein the element stops at the required target location.