LAPP - Innovative zeroCM® technology prevents electromagnetic interference
As digitisation and connectivity come together, it creates a space for the smart factory, where machines and systems increasingly need to be networked. This increases requirements with regard to electromagnetic compatibility. This is why LAPP has presented a new, innovative EMS solution with zeroCM® technology.
Especially in industrial plants where frequency-controlled motors are used, there is an increase in unwanted currents on the potential equalisation or earthing cables. LAPP therefore set out to investigate the physical coupling mechanisms within motor connection cables to come up with an innovative cable design.
Instead of solving the EMC problem via shielding, as is usually done, when developing the zeroCM® technology, LAPP rethought the entire cable design of the ÖLFLEX® SERVO FD zeroCM®. Three phase conductors are now symmetrically arranged and twisted into an inner layer. In addition, one protective conductor in an outer layer with opposite strand direction is made up around the three phase conductors in a specific lay length ratio. The insulation of the conductors is capacity-optimised and consists of polyethylene, polypropylene or a foam variant. Between the inner layer and the outer layer is a separating fleece.
In short, zeroCM® technology does not eliminate the cause of EMC interference, but it precisely addresses one of the main points where interference is introduced into the system environment. On the one hand, the new cable design allows the equalisation currents at the inverter output and on parallel paths such as data cables to be reduced by up to 80%. On the other hand, reduced cable charging currents reduce the load on and in the frequency converter itself: For example, longer cable lengths can be installed without the frequency converter operating outside its (EMC) specifications. ZeroCM® technology also prevents the occurrence of voltages at the earth potential (ground voltage) on the consumer side. This is especially important when, for example, sensitive sensors such as analogue transducers are used.
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