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A building automation system (BAS) is only as smart as the devices that are connected to it. It should come as no surprise that when providing comfort in a building, a variable frequency drive, or VFD, has kept pace. This comes in the form of connecting to a BACnet network and providing the plethora of information that it contains over the network. Whether the information is transferred over an Ethernet connection, BACnet/IP, or serially, BACnet MSTP, it can be easily passed along.

At is core, a VFD provides the ability to adjust the speed of a motor, resulting in the ability to vary the speed of the fan that is attached to the motor. When compared to the older traditional methods of air flow regulation, e.g. dampers, a VFD can provide more energy savings. The keys to its energy savings capability revolve around its topology and ability to take advantage of the affinity curves for fans.

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