The control system of this prepress machine is designed with a PLC-based architecture, integrating an HMI (Human-Machine Interface), pressure sensors, and multi-axis servo drives. It ensures fully automated management throughout the entire cycle, including feeding, positioning, frame installation, pressing, demolding, and discharging. The system allows flexible switching between automatic, manual, and maintenance modes, balancing high productivity with easy service and troubleshooting.
The electrical control adopts a Mitsubishi PLC as the central controller, while key electrical components are sourced from Schneider Electric. Servo systems are equipped with reliable domestic brands such as Inovance, ensuring stable performance and long-term reliability. An integrated UPS (Uninterruptible Power Supply) protects the system against sudden power failures, enabling the press to enter an emergency safety mode and preventing both personnel risks and product defects.
Strict sequential interlock logic is implemented to guarantee safe and precise operation. For example, the frame clamping cannot start before feeding and positioning are completed; the main press cannot descend unless the clamping units are in place; and demolding must be completed before the lifting and conveying mechanisms are activated. These interlocks, combined with safety limit switches and sensor feedback, effectively eliminate misoperations and equipment damage.
The HMI touchscreen interface provides real-time display of process parameters, machine status, pressure curves, and alarm messages. Operators can intuitively adjust settings and monitor operations. Key process data—such as pressure, displacement, time, and cycle history—can be stored and exported via USB, supporting remote diagnostics, data analysis, and process optimization.
The hydraulic unit is equipped with proportional valves and frequency-controlled pumps, ensuring precise adjustment of pressure and flow. Relief valves, safety valves, and a cooling system maintain system stability and safety under long-term high-load operation. Multiple pressure sensors enable closed-loop pressure control, ensuring each pressing cycle is stable, accurate, and repeatable.
In summary, the control system of this 250-ton prepress machine features high automation, robust interlock safety, intuitive operation, comprehensive data management, and remote connectivity. It is ideally suited for large-scale, continuous production and modern intelligent manufacturing requirements, significantly enhancing both productivity and product quality.