The Fumex Sync Control Unit is a modular, pre‑assembled ventilation control system that synchronizes the operation of extraction fans, motorized dampers, and frequency converters in industrial and laboratory fume extraction networks. Rather than requiring each extraction point to be manually switched or individually controlled, the Sync Control Unit automatically coordinates fan start/stop, variable speed regulation, and damper positioning based on the actual demand from connected extraction arms or workstations. The system operates on a 24 V DC control voltage for operator safety and integrates with pressure sensors and frequency converters to provide demand‑based ventilation, reducing energy consumption and noise during periods of low extraction activity.

Synchronized Fan and Damper Control — One System, All Extraction Points

• Integrated Fan and Damper Coordination: The Sync Control Unit simultaneously manages both the main extraction fan (start/stop, variable speed) and individual motorized dampers at each workstation or extraction arm. When a worker opens a damper at a welding station, the control unit automatically starts the fan and adjusts the fan speed to match the required airflow. When all dampers are closed, the fan ramps down or stops after a configurable time delay, preventing unnecessary energy consumption.
• Demand‑Based Operation via Pressure Sensor: For larger installations with multiple extraction points, the Sync Control Unit can be configured to use a pressure sensor in the main duct. As dampers open and close, the duct pressure changes; the control unit reads this pressure signal and adjusts the fan speed via a frequency converter to maintain a constant duct pressure. This demand‑based control ensures that only the energy actually required for the current extraction load is consumed, rather than running the fan at full speed continuously.

Flexible Configuration — Manual, Automatic, and Time‑Delayed Modes

• Manual Operation: Operators can manually start and stop the fan using a local switch or pushbutton connected to the control unit. This is suitable for small workshops where extraction is needed only occasionally and full automation is not required.
• Automatic Operation: The control unit can be configured to start the fan automatically when a damper is opened or when an extraction arm is moved into position. The fan stops automatically after all dampers are closed, with an adjustable after‑run time (0–15 min for vehicle exhaust extraction, configurable for other applications) to clear residual fumes from the ductwork.
• Remote Control Ready: The Sync Control Unit supports remote activation via external signals (e.g., from a building management system, a PLC, or a wireless remote control). This allows integration into larger facility automation systems where ventilation is coordinated with other building functions such as heating, cooling, and access control.

24 V DC Control Voltage — Safety and Compatibility

• Low‑Voltage Control for Operator Safety: All control circuits operate at 24 V DC, eliminating the risk of electric shock from the control interface and allowing the use of standard, non‑armored control cabling. This is particularly important in laboratory environments where operators may interact with control switches and dampers in close proximity to conductive equipment.
• Compatibility with Standard Motor Starters and Frequency Converters: The 24 V control outputs interface directly with standard motor contactors, soft starters, and frequency converters (including Fumex SFC series) from all major manufacturers, simplifying integration into both new and existing ventilation systems.

Applications

• Industrial welding and grinding workshops: automatic start/stop of extraction fans when welding stations are active, with time‑delayed after‑run to clear residual fumes
• Laboratory fume hood extraction: demand‑based fan speed control via pressure sensor, coordinated with fume hood sash position
• Vehicle exhaust extraction in fire stations, ambulance bays, and vehicle repair workshops: automatic fan start when exhaust hose is connected, with adjustable after‑run time to evacuate remaining gases
• Multi‑station extraction in manufacturing: synchronized damper control ensuring that airflow is directed only to active workstations, reducing total fan energy consumption