Centrifugal fans

ebm-papst centrifugal fans are available with forward and backward-curved blades. The quiet-running centrifugal fans with forward-curved blades are also supplied with a scroll housing. The centrifugal fans with backward-curved blades are designed as freewheel fans and do not require a scroll housing. In the case of centrifugal fans with external rotor motors, the motor is positioned in the impeller, ensuring not just optimum cooling of the motor, but also a particularly compact design. The entire range is available with both AC and GreenTech EC technology. In addition to being particularly energy-saving, the integrated electronics also make it possible to implement any control, monitoring and maintenance functions – for both the smart home and Industry 4.0.

The advantages of centrifugal fans from ebm-papst:

• AC and EC centrifugal fans with forward-curved blades
• "RadiCal" AC and EC low-pressure fans
• "RadiCal" EC system solution in scroll housing
• "RadiPac" and "RadiFit" EC medium-pressure fans
• Compact design thanks to external rotor motor technology
• Comprehensive product ranges for every application
• 100% speed control via analog or serial interface
• High efficiency through the use of GreenTech EC technology
• Quiet operation thanks to optimized flow control and sophisticated EC motor commutation
• Start-up made easy by perfectly coordinated components: Control system/motor/fan
• Extensive accessories

RadiCal impellers are made of high-tech composite material. Optimized flow control combined with high-efficiency GreenTech EC motors – not only for ventilation and air conditioning.

Those are the main features of the backward-curved centrifugal fans in the RadiCal series. The small RadiCal fans installed in an aerodynamically optimized 3D scroll housing are the latest addition.

This enhancement includes increased efficiency and added functionality such as measurement of air flow, air temperature or humidity.

So that this data can also be used, there is an optional serial MODBUS-RTU interface.

The impellers for the sizes from 133 to 560 mm are made of special composite material. This enables high rotational velocity and high power density for the fan.

The shape of the impellers was refined with complex simulation models in combination with measurements made on prototypes. The result is optimized low-loss flow through the impeller; there are no cross-section changes to cause losses in the impeller.

A uniform flow profile without laminar separation results in fewer sources of noise and better acoustics.

Changes and additions worth mentioning in this catalog are:

RadiCal with M3G150 Gen III:
In addition to the previous versions, sizes 500 and 560 are now available with the new EC motors in size M3G150 Gen III. “In addition” because the motors in combination with the known impellers deliver significantly increased air performance. To illustrate the air performance benefits compared with the previous
fans, their characteristic curves are shown in curve families for each size.

Active PFC with RadiCal:
Sizes 500 and 560 are now available with the new three-phase 3 kW motor with integrated active PFC.
With these products, we can now fulfill the increasingly frequent requests for total harmonic distortion of no more than 5%.
Their characteristic curves are shown with those of the standard fans in a curve family.
That makes it easy to find comparable types.

Small RadiCals with more of what you need:
A new addition to the catalog is size 175, with various motor/impeller combinations.
Also new are RadiCals in sizes from 175 to 250 in a version with MODBUS-RTU and a basic PWM version.
Sizes 190 and 225 are the first innovative RadiCals in a scroll housing.
The various designs from basic control to smart and autonomous open up whole new possibilities.

The new RadiPacs stand out with the following features:

• Best overall efficiency
• Comfortable noise level
• Compact design
• Fast availability
• Easy startup with uncomplicated configuration of control electronics
• Finely tuned system with pre-configured motor / control electronics / impeller unit
• Plug & play: fully pre-assembled unit ready to install
• Single source: one contact for everything
• Logistic advantages due to complete unit
• Complete product line without gaps
• No magnets with rare earths

As technological leader for ventilation and drive engineering, ebm-papst is in demand as an engineering partner in many industries. With over 15,000 different products, we provide the right solution for just about any challenge. Our fans and drives are reliable, quiet and energy-efficient.

Air flow measurement:

The differential pressure method compares the static pressure upstream of the inlet ring with the static pressure in the inlet ring.

The air flow can be calculated from the differential pressure (between the static pressures) according to the following equation:

q_V=k*√∆p q_V in [m³/h] and ∆p in [Pa]

If the air flow is to be regulated to remain constant, the inlet pressure must be kept constant:

∆p = q_V² : k² q_V in [m³/h] und ∆p in [Pa]

k takes into account the specific properties of the inlet ring.

The pressure is tapped at 1 (4) point(s) on the circumference of the inlet ring. The customer connection consists of a built-in T-shaped hose fitting. The hose fitting is suitable for pneumatic hoses with an inside diameter of 4 mm.

k-factors: (for RadiCal inlet rings)

High standards for all ebm-papst products

At ebm-papst we are always looking to improve our products to be able to offer customers just what they need for their particular requirements. Careful monitoring of the market enables us to constantly incorporate enhancements into our products. As shown by the technical parameters listed below, you can always be sure of finding the right solution from ebm-papst for whatever application you may have in mind.

General performance parameters

Any deviations from the technical data and technical parameters described here are given in the product-specific data sheet.

Degree of protection

The degree of protection is specified in the product-specific data sheets.

Insulation class

The insulation class is specified in the product-specific data sheets.

Installation position

The installation position is specified in the product-specific data sheets.

Condensation drainage holes

Information on condensation drainage holes is provided in the product-specific data sheets.

Mode of operation

The mode of operation is specifi ed in the product-specific data sheets.

Protection class

The protection class is specified in the product-specific data sheets.

Service life

The service life of ebm-papst products depends on two main factors:

• The service life of the insulation system
• The service life of the bearing system

The service life of the insulation system is essentially governed by the voltage level, the temperature and the ambient conditions such as humidity and condensation.

The service life of the bearing system is primarily governed by the thermal load on the bearings. For the majority of our products we use maintenance-free ball bearings which can be fitted in any installation position. Sleeve bearings can alternatively be employed, as described in the product-specific data sheets.

As a rough guide (depending on the general conditions), the ball bearings have a life expectancy L10 of approx. 40,000 hours of operation at an ambient temperature of 40 °C.

We will gladly provide you with a life expectancy calculation based on your specific usage conditions.

Motor protection/thermal protection

Information on motor protection and thermal protection is provided in the product-specific data sheets.

The following protection methods are provided depending on the type of motor and area of application:

• Thermal overload protector, in-circuit or external
• PTC with electronic diagnostics
• Impedance protection
• Thermal overload protector with electronic diagnostics
• Current limitation via electronics

If use is made of an external thermal overload protector, a commercially available tripping unit must be connected by the customer for shut-off. Motor protection conforming to the applicable standard must be fi tted for products not provided with a built-in thermal overload protector and not protected against improper use.

Mechanical strain/performance parameters

All ebm-papst products are subjected to comprehensive testing in conformity with the normative specifications and also incorporating the extensive experience of ebm-papst.

Vibration testing

Vibration testing is performed as follows:

• Vibration test in operation according to DIN IEC 68 Part 2-6
• Vibration test at standstill according to DIN IEC 68 Part 2-6

Shock load

Shock load testing is performed as follows:

• Shock load according to DIN IEC 68 Part 2-27

Balancing grade

Balancing grade testing is performed as follows:

• Residual imbalance according to DIN ISO 1940
• Standard balancing quality level G 6.3

Should your particular application require a higher level of balancing, please contact us and specify the details in your order.

Chemical and physical strain/performance parameters

Please consult your ebm-papst contact for any questions regarding chemical and physical strain.

Areas of use, industries & applications

Our products are used in a variety of industries and for numerous applications:

Ventilation, air conditioning and refrigeration technology, clean room technology, automotive and railway engineering, medical and laboratory technology, electronics, computer and office systems, telecommunications, household appliances, heating systems, machinery and installations, drive engineering.

Our products are not intended for use in the aerospace industry!

Legal and normative specifications

The products described in this catalog are developed and manufactured in accordance with the standards applying to the particular product and, if known, in accordance with the conditions of the particular area of application.

Standards

Information on standards is provided in the product-specific data sheets.

EMC

Information on EMC standards is provided in the product-specific data sheets.

Compliance with EMC standards has to be assessed on the final product, as EMC properties may change under different installation conditions.

Touch current

Information on touch current is provided in the product-specific data sheets.

Measurement is performed according to IEC 60990.

Approvals

Please contact us if you require a specific type of approval (VDE, UL, GOST, CCC, CSA, etc.) for your ebm-papst product.

Most of our products can be supplied with the applicable approval. Information on existing approvals is provided in the product-specific data sheets.

Air performance measurements

All air performance measurements are conducted on intake-side chamber test rigs conforming to the requirements of ISO 5801 and DIN 24163. The fans under test are attached to the measuring chamber with free air intake and exhaust (installation category A) and operated at nominal voltage, with alternating current also at nominal frequency, without any additional attachments such as a guard grill.

As required by the standards, the air performance curves shown are referenced to an air density of 1.15 kg/m³.

Air and sound measurement conditions

Measurements on ebm-papst products are taken under the following conditions:

• Axial and diagonal fans in airfl ow direction “V” in full nozzle without guard grill
• Backward-curved centrifugal fans, free-running with inlet ring
• Forward-curved single and dual-inlet centrifugal fans with housing
• Backward-curved dual-inlet centrifugal fans with housing

Sound measurements

All sound measurements are taken in anechoic rooms with reverberant floor. ebm-papst acoustic test chambers meet the requirements of accuracy class 1 as per DIN EN ISO 3745. For sound measurement, the fans being tested are positioned in a reverberant wall and operated at nominal voltage, with alternating current also at nominal frequency, without any additional attachments such as a guard grill.

Sound pressure and sound power level

All acoustic values are determined in accordance with ISO 13347, DIN 45635 and ISO 3744/3745 as per accuracy class 2 and given in A-rated form.

For measurement of the sound pressure level Lp the microphone is located on the intake side of the fan being tested, generally at a distance of 1 m on the fan axis.

For measurement of the sound power level L_w 10 microphones are distributed over an enveloping surface on the intake side of the fan being tested (see graphic). The measured sound power level can be roughly calculated from the sound pressure level by adding 7 dB.

Measurement set-up according to ISO 13347-3 and DIN 45635-38:

• 10 measuring points
• d ≥ D
• h = 1.5d ... 4.5d
• Measurement area S = 6d² + 7d (h + 1.5d)

Cumulative level of several sound sources with the same level

The addition of 2 sound sources with the same level produces a level increase of approx. 3 dB. The noise characteristics of several identical fans can be predicted on the basis of the sound values specified in the data sheet. This is shown in the adjacent graph.
Example: There are 8 axial fans A3G800 on a condenser. According to the data sheet, the sound pressure level of one fan is 75 dB(A). The level increase determined from the graph is 9 dB. This means that a total level of 84 dB(A) is to be expected for the installation.

Cumulative level of two sound sources with different levels

The noise characteristics of two different fans can be predicted on the basis of the sound values specified in the data sheet. This is shown in the adjacent graph.
Example: In a ventilation unit, there is one axial fan A3G800 with a sound pressure level of 75 dB(A) at the point of operation and one axial fan A3G710 with 71 dB(A). The difference in level is 4 dB. The level increase of approx. 1.5 dB can now be read off the graph. This means that a total level of 76.5 dB(A) is to be expected for the unit.

Distance laws

The sound power level is not governed by the distance from the noise source. By contrast, the sound pressure level decreases with increasing distance from the sound source. The adjacent graph shows the decrease in level under far field conditions. Far field conditions apply if there is a considerable distance between the microphone and the fan in relation to the fan diameter and the wavelength under consideration. On account of the complexity of the topic, literature should be consulted for more detailed information on far fields. The level in the far field decreases by 6 dB each time the distance is doubled. Different relationships apply in the near field of the fan and the level may decrease to a far lesser extent. The following example only applies to far field conditions and may vary considerably as a result of installation effects:
For an axial fan A3G300, a sound pressure level of 65 dB(A) was measured at a distance of 1 m. From the adjacent graph, this would yield a reduction of 26 dB at a distance of 20 m, i.e. a sound pressure level of 39 dB(A)