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Author: search.filters.author.Krongratana, V.Subject: search.filters.subject.PID Controller

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    Item type:Publication,
    PLC-based industrial temperature controller with different response times
    (2017-12-13)
    Gulpanich, S.
    ;
    Krongratana, V.
    ;
    Srimuang, Arthit
    ;
    Tipsuwanporn, V.
    ;
    Wongvanich, N.
    This work presents a temperature control of industrial ovens using block FB58 'TCONT-CP' from the Siemens S7-300 PLC, which is evaluated by the OB35 interrupt. Two plants were considered. The first plant was a small industrial oven made of aluminum of size 1.5 cm × 5 cm and taking in 60 W of heat. The second plant was a large industry oven with a 0.125 m<sup>3</sup> capacity, capable of exuding 1500 W of heat. Both experiments were controlled by the same Block Command and ovens were tested separately. The Cohen-Coon PID tuning method was firstly applied to both plants, with a separate controller values being obtained for each plant. These values were kept fixed throughout the experiments. A tailored approach was adopted whereby a pulse gen was used in conjunction with the PID control for the small plant; whereas a control zoning was used for the larger plant. Result show that the tailored approach yielded significant improvements in settling times compared to a conventional PID controller.