AKFD Axial fan for cooling and air handling
· noise optimized blade construction
· constant high degree of efficiency
· mountable in all installation positions
· several pre-assembled blade angles available
· wirde range of voltage- and frequency-controlled constructions
Features and Constructions:
Rosenberg axial fans with improved and noise optimized blades combined with a voltage controlled AC-external rotor motor form an optimized fan unit in regard to design and air movement.
The combination of voltage controlled Rosenberg-external rotor motors, flexible production of blades and high end metal fabrication, gives Rosenberg the capability to manufacture fan modules that provide the best possible benefit to customers while taking the design demands and the customers application into consideration. This is done mainly with the help of the three blade angles (G,K,N), which offer a variety of solutions for various customer applications.
Air heaters / Heat pumps / Condensors / Cooling Units / Evaporators / Chillers
Reference to Directives:
Declaration of incorporation and operating instruction are according to Machinery Directive 2006/42/EC, CE dentification in accordance to EMC-Directive 2014/30/EU, Low Voltage Directive 2014/35/EU and the Ecodesign-Directive 2009/125/EC.
Size 560 to 1000:
Axial fans with 6 blades made of die-cast aluminum.
Serving as finger protection and depending on the construction type also for mounting the fan onto the inlet cone. If the protection guard is only for the safety, the motor load-bearing function is taken by the motor support.
Inlet cone can be provided to suit customers individual requirements.
Rosenberg external rotor motors of size 137 comply with proctection class IP54. The winding insulation corresponds to insulation class F. Through the use of deep groove ball bearings, closed both sides, with specially paired grease lubricant, maintenance-free and low-noise operation is guaranteed. All AC-external rotor motors can also be manufactured in UL construction, upon request.
All motors are equipped with factory installed thermal contacts in the windings. Thermal contacs (TB) are temperature dependent control elements, controlling the winding temperature of the motor. If they are installed correctly, they protect the motor windings from overload, failure of a mains phase, standstill of the motor and from excessively high temperatures of the ventilated medium. We recommend the use of our motor protection control units in concert witth the installed thermal contacts. We also offer 5-step speed controllers. RTE and RTD types are equipped with thermal contact protection. An additional motor protection switch is not required.
The nominal voltage indicated on the name plate is valid with a max. allowed voltage tolerance of +/-10%. The standard construction has the cable out on the side. The connection ends are stripped at 10 cm and supplied with end splices.
Standard cable length for motor size 137 is 88 cm from the motor flange. Special cable lengths and fans with mounted terminal boxes are available upon request.
The performance data as indicated on the performance curve charts are standard versions at 50Hz 1~230V and 3~400V.
Motors for other voltages or frequencies are available upon request for an additional charge.
The required system-specific, optimal setting of the desired operatin point can only be attained with a suitable system for speed control. There are two common systems that can be used for speed controlling fans of this series.
Speed control is accomplished by reducing the terminal voltage. Using this method, the slippage is increased depending on the load and the speed is reduced. The air volume changes proportionally with the RPMs. All voltage controllable axial fans in three-phase current construction can also be speed controlled by a frequency converter from the nominal frequency on down.
Frequency Control for three-phase fans:
Speed control is accomplished by reducing the frequency through use of a frequency converter. The cut-off frequency, adjustable on frequency converter, is 50Hz for all fans. Each performance curve shows the max. frequency possible.
With frequencies higher than the rated frequency the motor will thermally overload. For emergency operation or upon failure of the frequency converter, all frequency controllable types can also be used direct with 400V on the 50Hz mains supply.
When operating the motors using a frequency controller the max. rate of voltage increase of 500 V/µs must not be exceeded. Depending on the frequency converter type and the length of the cable between motor and frequency converter additional components may be required.
Single phase fans may not be operated on a frequency controller.
Reference to Directives:
Declaration of incorporation and operating instruction are according to Machinery Directive 2006/42/EC, CE identificat ion in accordance to EMC-Directive 2014/30/EU,Low Voltage Directive 2014/35/EU and the Ecodesign-Directive 2009/
Air performance curves:
The performance curves for these fan types have been measured on a inlet side chamber testing platform according to DIN ISO EN 5801 in mounting position A (free inlet; free outlet) and are valid for air with a density of 1.2 kg/m³ and indicate the pressure increase ∆pfa as a function of the air flow.
The tests and their performance curves were conducted according to DIN 45635, part 38, and ISO 13347-3 in accordance with the envelope surface method, following data collection at several test points over a square measuring area.
The figures quoted are the "A" decibel figures which are the sound power levels at suction side LWA5.
The figures are measured in a room according to DIN 45653, part 2. In order to obtain sound pressure level in "A" decibel figures at a distance of 1 meter LPA , deduct 7dB(A) from the sound power level "A".
Testing conducted with inlet cone and without protection guard. Sound levels can differ according to the different construction type. It should be noted that sound levels may be strongly affecte by installation conditions, reflections, the acoustics of the room and other influential factors.
Rosenberg fans have a specific (pressure-) ratio < 1,05 (pressure < 5000 Pa).
For maximum service life of Rosenberg products please beware of the maintenance hints on the manual for each product type.
Recycling and disposal:
For recycling and disposal of Rosenberg products comply with applicable locally requirements and regulations.
For further information, please click the model below for detail.
Picture of Axial AKFD 1000-12 & AKFD 560-4 G to AKFD 900-8-8 G
Picture of Axial from AKFD 500-4 G to AKFD 500-4-4 K