Glossary – Cable assemblies



Frequently asked questions.

Become aware of more details of our products.  Learn more about standards, backgrounds and technology aspects. For you we did prepare everything in detail, separated according to the product groups. Enjoy by reading more!

The profibus (process field bus) distinguishes between 2 different types. There are the versions Profibus DP (decentral periphery) and Profibus PA (process automation). Within the mechanical engineering the Profibus DP standard is used. This type of bus is described by the international norm IEC 61158. Profibus DP is a 2-wire bus with 9600bit/s

to 12Mbit/s adequate for distances from 100m to 1200m. This bus is used for the electrical transmission via copper in a line based infrastructure. By using fiber optics for the transmission the distances can be extended up to 15km.

The Device Net system is commonly used in the field of industrial automation for connecting control units to one another. Device Net uses the controller area network as its basis.

The attenuation describes the reduction of the signal level on the cable. Therefore signal loss. To keep the attenuation low, the make-up length is supposed to be high. But this collides with inferior conditions for drag chain applications of a long make up length. See drag chain capabilities.


The Can-Bus (controller area network bus) is an accepted technology applied within vehicles. It is a field bus with a string/line infrastructure, additional strings/lines are possible in a limited way. The Can-Bus has to be terminated with 120 Ohm at its ends. This is necessary to prevent signal reflections and therefore communications errors. It is also possible to set up this bus with a star topology. The Can-Bus works on basis of voltage level differences, hence this bus is insensitive for external interferences. This is due to the fact that interferences influence both signal wires inside the cable and the voltage difference continues to be the same, the signal remains stable.

In accordance to the required data performance, the length and the corresponding loop resistance result the following cross sections for Can-Bus cables:

In order to achieve better drag chain properties, there is worked with a twisted wire make-up. It works like this: The lower the make-up length, the higher  the mechanical properties for drag chains. The reason for it is the compensation of the compressing and stretching within a single wire during drag chain motions. If the wires are not twisted, they will be damaged by the compressing and stretching in the drag chain. For drag chain applications the jacket of a cable is made generally of PUR (polyurethane).

The wave impedance is usually a real value (e.g. 50 ? or 100 Ω). This value is independent regarding the cable length, but it is not independent regarding the frequency. The frequency dependency is up to the dielectric material and has to be considered for all signal transmission. Another word for it is dispersion. The wave impedance is not the ohmic resistance, it is considered to be the emitter gate resistance of a endless homogeny cable without signal reflection.

The shielding is a electrical conductive cover for the functional wires of a cable. The shielding has 2 functions. It prevents interferences from decoupling off the cable, at the same time it prevent interferences from coupling into the cable. Both functions are equally important. There are 4 different shielding designs existing.

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Wind Energy

We`ve got the hang of it.


Renewable energy production is becoming increasingly important, especially wind turbines. With a hub height of 60 meters and 1.5 megawatts of power, wind turbines that were originally considered to be enormous are now standard and built worldwide using German technology. In order for the turbines to work perfectly as well as cost-effectively, the optimum balance between torque and speed must be found. For this, it is necessary to be able to adjust the rotor blades. It’s not enough to turn the head of the turbine into or out of the wind. In case of high wind speeds, rotor blade adjustment is an additional way to apply the brakes effectively and an important safety aspect.


All three rotor blades must always be aligned synchronously, because excessive forces can otherwise act on a single blade. This means the rotor blade adjustment must have a central control system that is also guaranteed to function even in case of power failure. To make the task even more difficult, the hub is only accessible from the outside. On the shaft of the rotor, only a few contacts are available on the slip ring for establishing a connection. A control system via the hub and accommodation of rotor blade technology in the nacelle are therefore not possible. On-site installation in the hub is not practical and economical due to the height and difficult accessibility.


The entire rotor blade adjustment system is supplied with electrical power just through the slip rings, so only a few contacts of the slip ring are necessary. A central control box coordinates the rotor blade positions, which are each adjusted by their own drive control. This includes a battery pack to maintain control capability in case of power failure. Everything is modular and ready to plug in. All connections are pre-tested on a specially designed test station with contact force monitoring, eliminating errors and ensuring fast commissioning.

The central control module connects the individual drive controls with a single connector kit in each case. These align the rotor blade with a servomotor. The pre-fabricated installation can be quickly incorporated into the hub on the ground. Supply, signals and bus are consolidated in a single robust plug connector. The rotor blade is completely installed electrically in no time.