Wongvanich, Napasool

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Wongvanich, Napasool
Alternative Name
Wongvanich, N.
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Email
napasool.wo@kmitl.ac.th

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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.
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    Item type:Publication,
    A study of flow-level cascade control with WirelessHARTTM transmitter using LabVIEW
    (2017-12-13)
    Somkane, Pongsakorn
    ;
    Kongratana, V.
    ;
    Gulpanich, S.
    ;
    Tipsuwanporn, V.
    ;
    Wongvanich, N.
    This work presents a cascade control architecture to combat network induced delays in Wireless network controlled systems. Specifically a flow-level cascade control system is considered whereby the primary process variable is liquid level, and the secondary process variable is the flow rate. The flow-level process variables are measured by Wireless HART differential Pressure (DP) transmitter and sent through a WirelessHART gateway. Control actions are provided by a control valve actuator which is manipulated through a PLC. The PLC and the WirelessHART gateway are managed by an OPC server providing a medium of communication. The PID controller gains are designed through the LabView software, in which the network induced delays is offset by adjusting the controller interval until the responses are satisfactory. Results show that cascade control outperformed the single loop control, in both handling network induced delays and coping with disturbances.