Automation of Electric Resistance Heating Furnaces. A Training Manual
Content:
Автоматизация электрических печей нагрева сопротивлением.pdf (573.92 KB)
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04.08.2026
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Description
- Electric resistance heating furnaces are key equipment in metallurgy, ceramics, glassmaking, food processing, and many other industries. Product quality directly depends on the accuracy and stability of the temperature regime. A control error can cost millions in spoiled products or lead to an accident.
- This practical guide covers the complete development cycle of electric furnace control systems — from physical fundamentals to cloud integration. It systematically covers all aspects of creating a professional automation system using Structured Text (ST) according to IEC 61131-3.
- The book covers in detail:
- Physical fundamentals of electric furnaces — Joule-Lenz law, heating element types, thermal inertia, heating and cooling dynamics.
- Key control system components — temperature sensors (thermocouples, RTD), actuators (contactors, SSR, phase-angle regulators), PLCs.
- ST programming — syntax, data types, operators, functions and function blocks, analog signal processing (ADC, scaling, filtering).
- Control algorithms — from simple ON/OFF to proportional (P), proportional-integral (PI), and full PID control with anti-windup and derivative filtering.
- PID tuning — Ziegler-Nichols method, practical coefficient selection, static error elimination.
- Single-zone electric furnace — complete control program with signal conversion, auto/manual modes, protection and indication.
- Multi-zone furnace — independent control of three zones with individual PID controllers.
- Cascade control — improved regulation quality through two-loop structure.
- Protection and diagnostics — multi-level protection (hardware and software), sensor integrity checks, hard temperature limits.
- SCADA and cloud integration — Modbus TCP and OPC-UA protocols, cloud data transmission, analytics and KPI in Python.
- All algorithms are accompanied by ready-to-use ST code with detailed comments. The book contains numerous practical examples: from a simple ON/OFF controller to a complete three-zone furnace control system with cascade regulation, protection, and cloud integration.
- The manual is intended for automation engineers, PLC programmers, commissioning engineers, students and teachers. It will help you master thermal process control system design — from concept to a complete industrial solution.
Additional information
- Part I: Fundamentals of Electric Furnaces
- Operating principle of resistance heating furnaces (Joule-Lenz law)
- Heating element types (wire, tubular, ceramic)
- Thermal inertia and time constant
- Furnace dynamics during on/off switching
- Part II: Programming Fundamentals
- Structured Text (ST) — syntax, data types, operators
- PLC introduction — architecture, scan cycle, manufacturers
- Analog signal processing — ADC, scaling, filtering (moving average, exponential smoothing, hysteresis)
- Part III: Control Algorithms
- ON/OFF control — logic, hysteresis, disadvantages
- P control (proportional) — formula, Kp selection, static error, feedforward
- PI control — integral term, anti-windup, parameter selection
- PID control — derivative term, derivative filtering, Ziegler-Nichols method
- Part IV: Practical Systems
- Single-zone electric furnace — complete control program, architecture, PID controller
- Multi-zone electric furnace — three-zone control, individual PID controllers
- Cascade control — outer and inner loops, improved regulation quality
- Protection and diagnostics — protection hierarchy, sensor integrity checks, hard limits
- SCADA and cloud integration — Modbus TCP, OPC-UA, cloud data transmission, analytics and KPI
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