When implementing cooling solutions for electronic equipment, system designers are confronted with a complex set of variables. However the motor bearings service life can be reduced as a result of continuous low-voltage operation mode (speed 1 or 2).UNDERSTANDING CLOSED-LOOP FAN SPEED CONTROL When operating in low-speed mode the fans with transformer speed control generate no unusual noise. Several fans may be connected to one power transformer if their total current does not exceed the maximum permissible controller current.

Transformer controllers are designed for voltage-controlled motors. Transformer speed controller operation is based on a five-step power transformer that regulates power supply voltage to the fan motors with permanent voltage frequency. The recommended speed control range is 60% till 100%. Low-voltage motor application results in reducing bearings service life. When operating in low-speed mode the fans with thyristor speed control may generate unusual noise, so the thyristor speed controllers are not recommended for low-speed applications. Thyristor controllers are featured with high control efficiency and accuracy. Several fans may be connected to one controller if their total current does not exceed the maximum permissible controller current. Operation of the thyristor speed controllers is based on output voltage control with a triac voltage regulator. Thyristor speed controllers provide smooth manual motor speed control and air flow control respectively. Engineering recommendationsįan speed is controlled with thyristor or transformer speed controllers. Determination of the Essential Air Exchange.Modular air distribution system FlexiVent.Air ducts for ventilation, heating and air conditioning.

Flexible air ducts for ventilation and air conditioning.Round and flat folding PVC duct system 'PLASTIFLEX'.Smoke extraction ventilation for parking premises.

Single-room ventilation systems with heat recovery.

Art-Deco: design decorative ventilation grilles.

DESIGN CONCEPT: design solutions for domestic ventilation.

Fan control