Description
The anti-interference filter is defined in such a way that it works by eliminating unnecessary parts of the spectrum of electrical signals, i.e. those parts that do not contain information relevant to the content of a given signal.
The filter is characterized by a loss of signal on the road on which it is located. This parameter characterizing the filtering efficiency is referred to as insertion loss. By definition, it is the level of the signal / U2 / left after switching on the filter referred to the signal level / U1 / observed at the same point of the system without a filter.
Attenuation expressed in (dB) = 20 log 10 (U2 / U1)
For network disturbances in the frequency range from 150 kHz to 30 MHz, RFI filters with a level of attenuation are used so that the emission level caused by these disturbances is lower than prescribed in the standards.
In RFI filters there are two components of symmetrical and asymmetric interference currents. The symmetrical component occurs only in the phase conductors of the power line and has a small share in the interference emission. The asymmetrical component of the current is the main source of radioelectric interference, flows in all phase conductors and in the neutral conductor, and returns back via a PE conductor or a grounding bus.
An important feature of the filter is its "reciprocity". This means that at given source and load impedances, the filter attenuation is the same in both directions: from the source to the receiver and from the receiver to the source. "Mutuality" does not mean reversibility, therefore manufacturers always indicate the power side.
 | "Footprint" anti-interference filters, mounted under the LS inverter, with increased class B attenuation. The use of these filters helps in easier assembly and - what is important - allows you to save space on the mounting plate in the control cabinet. The filter application only increases the depth of the inverter. The filters are manufactured from the highest quality components to meet the highest requirements of European EMC electromagnetic compatibility standards. |
Selection of FF filters for LS inverters
 | 1 series FEG anti-interference filters are designed for 1-phase frequency converters, drive systems, power supplies and industrial installations. It provides standards in accordance with the latest standards of electromagnetic compatibility and safety standards properties - Nominal current from 3A to 16A |
FEE - standard class A 3-phase filters
 | FEE anti-interference filters are standard filters designed for frequency converters, drive systems and power supplies. They are a great and economical solution, meeting the high demands of suppressing electromagnetic interference - 3-phase power supply for 480V voltage |
FLD - standard class B 3-phase filters
 | The FLD high interference suppression filter series is designed for frequency converters, drive systems, power supplies and industrial installations. It provides the highest standards of innovation, compliant with the latest standards of electromagnetic compatibility and safety standards. - 3-phase application for 480VAC voltage |
FEP - standard high power 3-phase class B filters
 | The FEP high interference suppression filter series is designed for frequency converters, drive systems, power supplies and industrial installations. They are designed for high power systems - Nominal current from 150A to 2500A |
