If you are looking for competence, performance and flexibility, Pfannenberg is the right partner. After all it was Pfannenberg who invented the filter fan thirty years ago and herewith founded switch cabinet air-conditioning. A pioneering achievement if you consider the fact that cool, clean air ensures that electronics last longer, thus protecting against the prohibitive cost of machine failure.
You can also benefit from our experience! Take a look at our wide range of high-quality air-conditioning components and you will always find the optimum solution for your particular need: From our patented filter fans to our superplaner compact cooling units for side-, internal as well as top-mounting, to air/water heat exchangers and water chillers for central operated cooling systems, as well as to switch cabinet heaters and the associated control devices.
You want to achieve your target by expending as little effort as possible: the maximum in fail safe operation for your production facility ensured by air-conditioning the electronic control systems. We do everything to support you in your effort: energy-saving technology, prompt planning, easy installation and efficient service.
Higher capacity!
Several detailed improvements have enabled us to increase capacity by up to 20%. This makes it worthwhile for you - especially for your pocket.
No worries about water in your switch cabinets
Air-condition your cabinets with water! Air/water heat exchangers extract the waste heat and deliver it to a water circulation system that is in turn cooled by a central located water chiller. A particularly economic method with low impact on the environment.
 | Prompt planning and easy installation We have made it as easy as possible for you: One single template accommodates all of the cooling units in a particular range, in this example four models. You can cut out the panel on your switch cabinet before you know the capacity you need to install. And installing our patented filter fans? Simply press the fan into place, "click and it fits!" There's nothing faster than that! |
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Optimum method of directing airflow
Take advantage of and support natural convection - that is the optimum method of directing airflow. We draw in warm air from the switch cabinet at the very top and blow in cold air at the bottom. This is an absolutely effective system of preventing heat pockets.
Talking about environment!
Environmental protection is important. That's why we certainly use ozone-friendly refrigerants (R 134a) as well as receive and properly dispose old equipment. And in all modesty: We were the first in our industry to do so.
Worldwide service?
If you are "hot around the collar" because on of your units has developed a fault, we won't drag our feet. Our overnight service makes sure that your spare parts are dispatched from one day to the next - anywhere in the world! Our word is our bond!
Switch Cabinet Air Conditioning with Filter Fans
General Filter Fan Information
In the past those who needed to ventilate their switch cabinets employed a simple grill which every cabinet manufacturer offered as an accessory. Through the principle of natural convection (warm air rises) an air flow was established between the lower and upper regions of the cabinet. Unfortunately these openings also allowed dust to enter the enclosure. After a short time all the internal components became coated with a layer of dust. The insulating properties of this contamination resulted in localized overheating of the switch cabinet components. A further disadvantage of this insulating layer was a reduction in the service life of the components themselves. An increase of only 10° Kelvin in the operating temperature halves the service life of the components.
The moment for Pfannenberg Filter Fans came in 1965. A simple cloth placed over the fan served as a filter. Right up to today's modern filter fans, the basic principle of filtration remains the same. Fan, filter and protective measures are the heart of Pfannenberg Filter Fans. In any event, the timely introduction of the PF series provides a compact design (max. 6mm external projection) and the cost saving "...click and fit" fastener free fixing system. Naturally we use only the highest quality components in our filter fans. Manufactured in Europe, the fans employ ABS housings with flame-resistant properties similar to UL-94 VO. This is why we can offer protection to DIN 31001, IP54, as well as a 350g filter as standard wit a filtration efficiency of 83%, established during strict testing to Ashrae standard 52-68. All the stated air flow and resistance values were measured in a double chamber and have been prepared in diagrammatic form for easy reference.
"...Click and fit" After many years experience with filter fans we launched the new series in 1990. Outstanding features of this design include the compact construction (only 6mm visible) and the patented "Click and fit" quick action fixing system developed exclusively by Pfannenberg for fastener-free installation.
This completely does away with tiresome screws for fixing filter fans and exhaust filters, and saves up to 24 minutes of valuable installation time.
"...Click and fit" is ideal for painted panels form 1.5 to 3.0 mm thick.
Filter Fan Technology
The waste heat produced inside the enclosure warms the outside air drawn into the cabinet by the filter fan. The heated air is returned to the outside environment through the exhaust fan. The maximum temperature is limited by the operating temperature of the installed components.
Using the following simple formula it is possible to determine the requisite air flow for any filter fan. The basis of this comparison forms the main principle of thermal science.
The filter fan which has been chosen to match the necessary air flow should supply a minimum of 10% more air than required to provide reserve capacity for extreme operating conditions, or contaminated filters.
The best location for the filter fan is in the lower third of the enclosure. This configuration assists the natural air flow upwards in the enclosure. Ideally, air should always be blown into enclosures, so that the resultant pressure differential prevents the ingress of dust.
Pfannenberg offers a wide range of filters for every application. Series FLF 02 and PF 1000 employ a large filter with a weight of only 150g/m². The filtration efficiency of this filter is 62%. All other filter fans are fitted with our standard 350g/m² filter. This filter provides a filtration efficiency of 83% for particles of 10 micrometer diameter. Sometimes it is necessary to fit an additional superfine filter. Dust particles up to 0.5 micrometer are filtered out with a filtration efficiency of 96%. All these air and filtration tests were established in accordance with Ashrae standard 52-68.
PRESS RELEASE 05
Cooling unit makes enclosures fit for the tropics
A new type of cooling unit protects enclosures and their sensitive electronics from tropical heat and humidity.
In tropical countries, switchgear installed in the open, for example in telecommunication or traffic light control systems, is exposed not only to high ambient temperatures, but also high levels of humidity. To prevent faults, it is not enough to cool the interior; it must also be dehumidified.
For this reason, Pfannenberg were commissioned by a leading manufacturer of telecommunication systems to modify their side-mounted DTS 7301 cooling unit accordingly. In the meantime, the Hamburg company includes the model as standard unit in their product range. As a preventive measure against corrosion the housing is made entirely of aluminium, which is also resistant against seawater.
The unit operates with a rated voltage of 230 V and a maximum refrigeration capacity of 1400 W. The temperature inside the switch cabinet is maintained at a level between approx. 28 and 33 °C. An ingenious switching system, designed as 3-turn control, uses the refrigerating machine and integrated heaters to maintain the relative humidity.
This model is a must for switch cabinet air-conditioning applications in any tropical or subtropical climate, especially in telecommunication equipment, control systems, amplifier and traffic light control systems, or any other application in which a constant level of relative humidity is imperative.
PRESS RELEASE July 1998
Cool air for cold working
At Bad Düben, they rely on switch cabinet cooling units from Pfannenberg in Hamburg, for their world-renowned thread rolling machines and profile mill cutters
One company in the new Federal German States that has made its mark on the global market to play a leading role is Bad D�ben PW GmbH, which manufactures its thread-cutting machines and profile mill cutters under he brand name "Profiroll". With a wealth of experience stretching back 55 years, the roughly 200 employees have succeeded in upholding the tradition of the PEE-WEE-Maschinen- und Apparatebau.
New products, such as ring-roller mills, have made a substantial contribution to the renaissance in cold working and the development of the company. Today, Bad D�ben not only provide a wide range of CNC machines for ring rolling, thread rolling and profile mill cutting, but also the matching tools and associated services.
Innovation and tradition coupled together with the highest demands in quality have made this success story possible. Thus, the people at Bad D�ben trust the powerful DTS 7541 switch cabinet cooling units from Pfannenberg to keep their machines' control systems.
"Long air passages" prevent heat pockets
These side-mounted units, with a cooling capacity of 2500 W, feature a "long air passage", an air duct integrated into the unit: The cool air is drawn in far down at the bottom of the switch cabinet and the warm air extracted at the very top. This means that the whole interior of the switch cabinet is enveloped by cool air in an optimum manner. No chance for those dreaded heat pockets!
An additional useful detail: The installation cutouts for air intake and extraction fit all the cooling units in the DTS 7x41 family, comprising four units with a useful cooling capacity ranging from 1100 W to 2500 W. This enables you to do the cutout work before you know the level of cooling capacity you require. You can increase the fitting depth by recessing up to 140 mm using an installation frame.
Planning personnel will also be pleased that Pfannenberg can deliver their cooling units powder-coated in any RAL colour they may require. And of course, the Hamburg manufacturers use the environmentally friendly coolant R 134a.
Cold working under the brand name "Profiroll" has enjoyed a worldwide reputation for decades: In order to ensure that the CNC machines for ring rolling, thread rolling and profile mill cutting ring ""don't gasp for air", the people at Bad D�ben put their faith in switch cabinet cooling units from Pfannenberg.
PRESS RELEASE August 1998
Cool air for high-quality textiles
Pfannenberg cooling units keep the air cool in the switch cabinets on the twine machines at Saurer-Allma in Kempten
At Saurer-Allma GmbH in Kempten everything revolves around twine. Saurer-Allma are specialists for twine machines, products that are just as much in demand in fashion as they are in industry. The range of application extends from the "fine threads" of a suit, to domestic textile goods such as curtains and floor coverings, to sturdy technical textiles used in the manufacture of tyres or in the aviation and aerospace industries, whereby 95% of the twine machines are exported all over the world.
For example, ultra-modern equipment is used to produce the Saurer Cable Corders, cabling machines for manufacturing symmetrical double tyre cord and industrial twines, machines featuring remarkable technology and of impressive proportions. The demands on the reliability of these twine machines are extremely high, since they are expected to operate round the clock on every continent in different climatic conditions.
That is why Saurer-Allma rely on Pfannenberg cooling units from Hamburg to keep their machinery control systems cool. The equipment in use consists of PWS 7402 air/water heat exchangers with central cooling systems and also DTS 7541 compact side- or door-mounted cooling units with a cooling capacity of 2500 W.
Cooling, filtering and dehumidifying the air in the switch cabinets ensures that the twine machines "keep their cool" at all times and prevent an overheated control system or corrosion from causing machine failure. Because, after all, electronic components are sensitive to heat and age a lot faster when they are constantly exposed to excessive temperatures.
The DTS 7541 switch cabinet cooling unit from Pfannenberg at Saurer-Allma in Kempten ensures optimum cooling for the cabling machines used to manufacture tyre cord
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