Equipped with a complete supporting electrical control system,Electrical engineer design the control solution according to furnace requirements. The features PLC centralized control, intelligent temperature adjustment and automatic operation. The whole system ensures stable running, high control accuracy and safe, reliable production. Key electrical components are sourced from well-known mainstream brands including Schneider Electric, ABB, Siemens, Delta, Yudian (Xiamen) and Schneider.
The following is a simplified workflow for the supporting electrical control system of the heating furnace: [Parameter Setting and Pre-inspection] ➔ [Automatic Ignition/Power-on] ➔ [Closed-loop Closed-pulse PID Control] ➔ [Process Monitoring and Interlock Protection] ➔ [Data Logging and Shutdown]
1. Parameter Setting and Pre-Check: The operator enters the process curve (heating rate, holding temperature, and holding time) via the HMI (or host computer). The system automatically performs a pre-check on the furnace door status, cooling water pressure, gas/power supply pressure, and safety circuits.
2. Automatic Ignition/Power-On: Gas Furnace: The purge program is initiated to remove residual gases; the proportional valve or pulse valve is opened; high-voltage ignition is performed, and the flame signal is detected. Electric Furnace: The main circuit breaker is closed, triggering the output of the solid-state relay (SSR) or thyristor (SCR) power controller.
3. Closed-Loop PID Control: Thermocouples continuously measure the furnace temperature and feed the data back to the PLC or temperature controller. The PID algorithm precisely calculates the output signal, dynamically adjusting the burner opening or the SCR trigger angle to maintain the furnace temperature in close alignment with the setpoint curve (with an accuracy of up to $\pm 1\ ^\circ\text{C}$).
4. Process Monitoring and Interlock Protection: The system monitors anomalies in real time, such as overtemperature, undervoltage, thermocouple break, and water flow interruption. Once a danger threshold is triggered, the system immediately shuts off the gas valve or main power supply and activates audible and visual alarms.
5. Data Logging and Shutdown: Paperless recorders or industrial software (SCADA) archive temperature and operating curves in real time (meeting industrial traceability requirements). Upon completion of the process, the system safely cools down according to the set curve and cuts off the main circuit.
Copyright © Henan Tianli Thermal Equipment Co., Ltd. Power by yisainuo
