an industrial controller for injection molding machines models the injection molding machine by observing ram state in response to control variables to alert the user when a control profile may be physically unrealizable and to inhibit a learning process to avoid extreme actuation of the controlled components such as may be detrimental to later control accuracy . simultaneous velocity and pressure control of the ram , with separate profiles , may be obtained by open - loop control of either pressure or velocity and continuous closed - loop control of the other control variable .