High-Efficiency & Inverter-Controlled Fans
Product overview
Project-selected fan, motor and variable-frequency-drive arrangements for ventilation systems with changing duty. Performance and efficiency statements apply only to the exact documented fan–motor–drive package selected for the project.
RAFAVENT VARIABLE-SPEED VENTILATION
Technical boundary: A variable-frequency drive controls motor speed and can reduce input power when the required duty is lower. It does not by itself make a fan high-efficiency. The result depends on the fan and impeller, motor, operating point, drive settings and system resistance.
Variable-speed axial arrangements selected for airflow, pressure, installation limits, acoustics and the required control method.
Pressure-oriented arrangements for ducted, filtration, air-handling and industrial ventilation duties.
Project-specific packages selected around the actual duty point, installation environment and electrical requirements.
Variable fan speed within the approved operating range
Soft starting and controlled acceleration or deceleration
Pressure or airflow regulation when suitable sensors and controls are specified
BMS interface where the selected VFD and project documents support it
Closer matching of fan output to changing system demand
Select the fan close to an efficient operating region for the required duty.
Use a suitable high-efficiency motor where its class and availability are documented.
Define minimum and maximum permitted speed and any resonance exclusion bands.
Commission the fan, motor, VFD and control loop as one system.