Integrating window drives into building management systems

In larger buildings with many windows, skylights, or facade vents, an isolated drive control system quickly becomes insufficient. To ensure that architects, electrical engineers, and facility managers maintain an overview, window drives must be seamlessly integrated into the central building management system (BMS).

Why window drives are connected to the building management system

A connection to the building management system (BMS) enables centralized monitoring and remote control of all drives from one location, unified alarm and fault management, and interaction with heating, ventilation, and air conditioning systems – for example, for automated night cooling via open window drives. Especially when Smoke and heat exhaust ventilation systems A clean connection is also relevant for safety, as status messages from the drives must be traceable at all times.

Which interfaces are suitable?

Several bus systems have become established in building automation, allowing window drives to be connected to the building management system (BMS) – including KNX, Modbus, and BACnet. The system used usually depends on the existing building automation system and the electrical planner's specifications. It is important to define the interface early in the project so that the appropriate drives can be planned from the outset.

Synchronization of multiple window drives

As soon as multiple drives on a single window or several windows on a facade need to open together, a simple on/off control is no longer sufficient: If the drives don't run exactly synchronously, sashes and skylights can become misaligned or wear unevenly. A synchronization function ensures that multiple drives work together at identical speed and position. Our VS-LA-i smart linear actuator This function is already included as standard and can be directly integrated into bus systems.

What needs to be considered when planning integration

• Coordinate the interface and bus system early on between facade, electrical and building automation planning.
• Define clear feedback signals – status open/closed, fault, maintenance requirement
• In combined systems: Smoke and heat exhaust ventilation (SHEV) activation in case of fire must always take priority over everyday building management system (BMS) control.
• Clarify the drive type and synchronization requirements together with the manufacturer before finalizing the electrical planning.

Für einzelne Räume ohne Anbindung an die Gebäudeleittechnik genügt oft eine lokale Lösung mit Taster, Steuerung und Regensensor – mehr dazu im Beitrag Ventilation control for window actuators.

Conclusion

Window drives that integrate seamlessly into building management systems save operating costs and simultaneously increase the safety of smoke and heat exhaust ventilation systems. Considering the appropriate interface and synchronization function during the planning phase prevents later retrofitting. We would be happy to advise you on which drive solution is best suited for your building management system project.