Thepmanee, Teerawat

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Thepmanee, Teerawat
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teerawat.th@kmitl.ac.th

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    Item type:Publication,
    Reliability enhancement of LNG fuel gas supply system in combined-cycle power plant
    (2020-12-01)
    Thepmanee, Teerawat
    ;
    Nachasingha, Chakri
    ;
    Kummool, Sart
    This article aims to present a technique to enhance reliability of liquefied natural gas (LNG) fuel gas supply system (FGSS) of gas turbine unit in a combined-cycle power plant. In order to prevent unplanned plant shutdowns, the proposed technique is based on the use of failure modes, effects, and diagnostic analysis (FMEDA) to identify and evaluate the effects of possible failure modes, to determine what could minimize the chance of failures, and to design a new safety interlock. The studied FGSS consists of gas analytical system (GAS) in 2-out-of-2 voting scheme, shutdown valve system (SDV) in 1-out-of-2 voting scheme, fuel gas controller (FGC), and engineering/operator workstations. Two automatic GAS subsystems with different measurement methods are installed in the GAS. One of two GAS subsystems uses three gas chromatography analyzers in 2-out-of-3 voting scheme. The gas chromatography results and diagnostic alarm historian are utilized to consider the failure behavior. The reliability models for the GAS subsystem using gas chromatography and the overall FGSS are also included to confirm the effectiveness of utilizing diagnostic information from the gas analyzers. Based on the FMEDA results, the new safety interlock with no additional software and hardware costs can be achieved. The workability of the proposed safety interlock is demonstrated by test results.
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    PLC FUNCTION BLOCK CREATION FOR MINIMIZING DATA LINK LIMITATION ON CC-LINK-BASED CONVEYOR HANDLING SYSTEM
    (2022-07-01)
    Pongswatd, Sawai
    ;
    Niyomtamarat, Patipak
    ;
    Kummool, Sart
    ;
    Thepmanee, Teerawat
    In order to solve a facing network capacity problem when improving an existing conveyor handling system controlled by programmable logic controllers (PLCs) on master-slave control and communication link (CC-Link) network at a wooden pallet manufacturer, this article presents a software technique for short-term solution. For new requirements to upgrade a pallet sortation to be automated by installing new robotic handling unit, a slave PLC using an interface module modeled FX2N-32CCL (or slave PLC1) cannot receive all specified data of pallet production models from an existing master PLC using intelligent module modeled QJ61BT11N in one communication cycle due to limited data links. To overcome this limitation, a PLC function block creation based on data sorting approach is proposed. Two new function blocks named FB SEND and FB RECEIVE are created based on IEC61131-3 standard for adding to the existing ladder diagrams, which execute on the master PLC central processing unit (CPU) and slave PLC1 CPU, respectively. Experimental results verify that the created function blocks can provide data transfers correctly between the specified sources and destinations. The data received at the slave PLC1 CPU are similar to the data sent from the master PLC CPU. With the proposed solution, the desired conveyor handling system can be upgraded according to user’s requirements.
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    APPLYING MELSOFT GEMINI SOFTWARE FOR DIGITAL TWIN CREATION IN AUTOMATION SYSTEM PROJECT PHASES
    (2026-08-01)
    Thepmanee, Teerawat
    ;
    Sopha, Watcharapon
    ;
    Asadi, Farzin
    ;
    Pongswatd, Sawai
    ;
    Kummool, Sart
    In the era of Industry 4.0, Digital Twin (DT) technology played a critical role in advancing manufacturing systems, particularly in real-time process simulation, performance optimization, and strategic decision-making. This study presents the application of MELSOFT Gemini software to develop DT for simulated industrial automation project phases. The system is designed to enable seamless data access and integration from physical devices into the DT in accordance with ISO 23247. The development process comprises two phases. The pre-deployment phase involves creating 3D models and simulating system behavior within a virtual environment prior to actual implementation. The Synchronized Operation phase enables visualization in MELSOFT Gemini through the transmission of data from physical devices via Operational Technology (OT) systems and Autonomous Mobile Robots (AMRs), using standard protocols such as OPC UA. The developed system accurately replicates the actual production process, provides early safety alerts, supports connectivity with various device types, and allows for future scalability all while maintaining compliance with the ISO 23247 framework. These findings demonstrate the potential of MELSOFT Gemini as a core platform for implementing practical, industry-ready DT systems.