AKBD

AKBD/_E 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

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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.

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.
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Impellers:

Size 315 to 400:
Axial fans with 5 blades made of steel.

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Guard:

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.

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Inlet Cone:

Inlet cone can be provided to suit customers individual requirements.

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Motors:

Rosenberg external rotor motors of size 080 comply with proctection class IP44. 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.

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Motor Protection:

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.

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Electrical Connection:

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 080 is 68 cm from the motor flange. Special cable lengths and fans with mounted terminal boxes are available upon request.

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Voltage Types:

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.

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Speed Control:

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.

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Voltage Control:

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.

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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.

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Reference to Directives:

 Declaration of incorporation and operating instruction are according to Machinery Directive 2006/42/EC, CE identification in  accordance to EMC-Directive 2014/30/EU,Low Voltage Directive 2014/35/EU and the Ecodesign-Directive 2009/125/EC.

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Important notes:

 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.  

 Noise levels:
  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.

 Erp-Information:
  Rosenberg fans have a specific (pressure-) ratio < 1,05 (pressure < 5000 Pa).

 Service life:
 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 Fans AKBD