The laminator prototype was equiped with standard Omron temperature control hardware modules (CJ1W-TC002). These modules contain PID algorithms, but the code cannot be changed. As a result, one cannot analyse the control challenge properly, and there are no options to improve PID control with add-ons.
Figure 1: Open loop response to step change on Manipulated Variable (heat input)
Figure 2: Closed loop response to setpoint change, for verification. Since the simulated response matches the measured response, this confirms that the model of the process seems to be suitable (for control design), and that the PID controller responds as simulated.
Figure 4: First production test: temperature deviates, on average, from setpoint.
Figure 5: Successful production test.