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English lessons
Two complete courses translated from the Thai originals, with the same diagrams, formula IDs, calculators and simulators. Every example uses the 230/400 V 50 Hz low-voltage supply shared by Thailand, Laos, Cambodia, Vietnam, Myanmar, Malaysia and Singapore, so the device ratings and settings apply directly in all of these countries. Use the ไทย / EN switch at the top of any page to jump to the same page in the other language.
Chapter 21 · 15 pages
AC Motor Control with Magnetic Contactors and VFDs
Induction motor principles and nameplates, the 400 V 50 Hz supply and earthing, star and delta connections, contactors and overload relays, IEC symbols, DOL and reversing starters, a detailed star–delta starter, soft starters, applied circuits, VFD principles and set-up, design, installation and troubleshooting, plus a starting simulator.
Chapter 22 · 11 pages
Industrial Automation with PLCs
PLC hardware and the scan cycle, sink/source I/O wiring, ladder logic, timers and counters, the IEC 61131-3 languages, PLC motor control including star–delta, sequential control and SFC, analog signals, PID and VFD control, commissioning and machine safety, plus a ladder simulator.
Short English articles with worked examples (Laplace transform, vectors, power factor, matrices, PID) are in the English articles.
The Thai library with all other subjects (calculus, linear algebra, Laplace, control systems, power electronics, solar PV, power systems, sensors) is at คลังความรู้ (Thai).