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What is an electronic fan speed controller for AC motors?

 
Electronic fan speed controllers offer continuous variable fan speed control by reducing the motor voltage. To reduce the motor voltage, they use phase angle control (TRIAC technology). A TRIAC is an electronic component that can be compared to a light switch. Either the electric current is allowed to pass, or it is blocked. A piece of energy is removed from the available power supply twice per cycle. By reducing the motor voltage in this way, the fan speed is reduced.

 
 Triac controller
 
Electronic fan speed controllers operate completely silent, they are very easy to install and they don't need no configuration. The Sentera product range features electronic fan speed controllers for 1ph 230 Volt or 3ph 400 Volt AC voltage controllable motors. Typically, they are used to control fan speed or pumps in HVAC applications. 
 
Fan speed controllers that work via phase angle control operate completely silent. Depending on the motor type, some additional motor noise at low speed might occur. 
 
These types of fan speed controllers offer you advantages in terms of comfort - optimisation of the supply of fresh air in your building, in terms of health - improvement of the indoor air quality as well as in environmental terms - thanks to the optimised airflow, your ventilation system will be more energy efficient.
   
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