Variable Frequency Drive (VFD) for Fans
Fans are widely used in industrial installations for ventilation, cooling and air handling in production environments.
The required airflow often varies depending on occupancy, climate conditions or production demands.
To ensure efficient and reliable operation of ventilation systems, precise control of fan speed is essential.
A variable frequency drive (VFD) enables dynamic control of fans, allowing airflow to be adjusted exactly to actual demand.
Within modern industrial automation, VFDs are a key component of reliable
drive technology and efficient motor control.
Constant Airflow and Pressure Control
With a VFD, the fan speed can be automatically adjusted based on airflow or pressure.
By using an integrated PID controller, stable control behavior is achieved, maintaining constant pressure and airflow in the ventilation system.
This type of VFD integration allows ventilation systems to be easily connected to
machine control systems and industrial process control.
More technical background on VFD operation can be found in the
Fluxcon variable frequency drives wiki.
Improved Performance
By adjusting fan speed, fans operate more efficiently and produce less noise.
In addition, resonance issues can be avoided by defining so-called skip frequencies.
This increases system reliability and ensures stable performance in industrial ventilation and process installations.
Energy Savings with VFDs
A major advantage of using a VFD for fans is energy savings.
Since maximum capacity is only required occasionally, fan speed can often be significantly reduced.
A speed reduction of approximately 10% can already result in energy savings of more than 25%.
Would you like a calculation example or more information about energy consumption?
Then visit our VFD FAQ.
IE3 Efficiency Directive
Since January 1, 2015, the IE3 efficiency directive for electric motors has been in force.
All motors from 0.75 kW up to and including 7.5 kW must meet IE2 efficiency requirements,
and all motors above 7.5 kW must comply with IE3 efficiency or IE2 in combination with a
variable frequency drive (VFD).
Reduced Maintenance Costs with VFDs for Fans
Lower pressure and airflow mean the fan operates under reduced load.
This results in less wear, lower maintenance costs and a longer service life.
Suitable VFDs for Fans
The compact VFD series includes a built-in PID controller.
Based on an analog signal from a pressure sensor, the fan can automatically maintain the desired pressure and/or airflow.
