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Despite the growing popularity of demand based ventilation systems, which utilizes sensors to determine the ventilation needs, manual ventilation systems are still considered popular. At the design stage of a ventilation system, an important decision is the choice between a simpler manual control via potentiometers or a fully automated control system with sensors that often make manual setting very difficult.

In most cases, a ventilation system is requested to operate in varying conditions. As a result, fans that operate at a constant speed are often over-performing which results in energy loses. Variable frequency inverters are devices, often found in commercial facilities, that are used to control the rotational speed of fan’s motors. Besides fan speed control, VFD are also being used in air conditioning compressors and for the control of water pumps.

The importance of HVAC control systems in achieving the desired indoor conditions at the minimum possible energy consumption cannot be overstated. As buildings are still one of the major energy consuming sectors worldwide, the emphasis on the development of energy saving control solutions by the industry and the academia is becoming stronger.

The SDX infinitely variable fan speed controllers regulate the speed of small, single phase AC motors up to 3 Amps. Not only has the design of the enclosure been modernised, but also the electronics are brand new and offer many benefits. Especially the quieter motor operation at low speed is remarkable.

Since many years, Sentera is one of the leading manufacturers of fan speed controllers – devices to control the rotational speed of voltage controllable AC motors.