PLC-Based PID-Predictive Controller Design for 3-Phase Induction Motor on Centrifugal Machine for Sugar Manufacturing Process

3-phase induction motors have been widely used in many industrial applications e.g. on the centrifugal machine for sugar manufacturing process. Centrifugal machine is used in liquid separation process. The motor should be able to track the reference to maintain the sugar quality. Therefore, the speed controller should be added to overcome this problem. However, conventional controllers have not been successful for real time applications because of the change of reference. Predictive techniques are best suited for these situations. And the control algorithm should be able to be applied in the PLC since it is for industrial purposes. This paper presents a case study on speed control of 3-phase induction motor using PLC-based PID-predictive controller. The PID-predictive controller starting gain is chosen 18. The tracking gain is adjusted until the final value is 3. The implementation results reported in this paper demonstrate the effectiveness of the proposed controller against the change of reference. The RMSE is 7.86 and it is lower compared to PID. On top of that, the control algorithm can be applied to PLC by using ladder diagram.