The GEFRAN 1550 is a single-loop PID temperature controller with a large multicolor LCD display, designed for industrial heating and cooling applications. It combines a universal input, fast 60 ms sampling, and optional Modbus RTU communication with advanced functions such as a setpoint programmer, autotuning, and heater break diagnostics.

Flexible Control and Programming

• Programmable Setpoint: The built‑in programmer supports 4 different programs, each with up to 24 steps, enabling complex thermal profiles.
• Autotuning PID: Automatic calculation of optimal PID parameters reduces commissioning time and maintains stability even with changing loads.
• Heat/Cool Outputs: Up to 3 configurable outputs (relay or logic) enable direct control of heating, cooling, or motorized valves.

Advanced Diagnostics and Energy Monitoring

• Heater Break Alarm: By monitoring the load current via a CT input, the controller can detect a failed heating element or SSR, preventing unexpected downtime.
• Energy Counter: An integrated totalizer measures energy consumption, helping to optimize process efficiency.
• Scrolling Messages: Multilingual diagnostic messages appear on the LCD, simplifying troubleshooting.

Communication and Integration

• Modbus RTU: The serial interface allows easy connection to PLCs, HMIs, or SCADA systems for remote monitoring and parameter setting.
• Programmable Logic Blocks: Custom logic functions reduce the need for an external PLC by executing simple sequences directly on the controller.

Applications

• Plastics and rubber processing (extruders, injection molding machines)
• Heat treatment furnaces and ovens
• Packaging and sealing equipment
• Test benches and laboratory applications