System requirements with regard to EMC-stability
Instruction handbook Mains filters BFN
Document No.: 5.09010.03 Baumüller Nürnberg GmbH
52
of 70
7.5
The distance from the last screening contact point to the cabinet’s outlet must be very
short.
Figure 16: Cable installation - cabinet outlet
Screening m The cable screen is effective at magnetic fields, if the screen is connected to ground
on both ends.
m A scre
ening effect at electric fields is already existing, if the screen is connected only
single-sided to ground.
m F
ields with high frequencies always are electromagnetic fields. Thereby it does not
matter, if it is an electric or a magnetic field. Here screening must be made on both
sides.
Figure 17: Cable installation - apply screen
m Applying the screen to ground on both sides achieves that the cable remains in the
screening „system cabinet“.
m T
he both-sided grounding of cable screenings nearly excludes an influence due to
ground loops (potential differences on the ground system).
m Th
e HF-connection of a screen with ground can also take place capacitively. This
avoids low-frequent errors due to ground loops.
Screening cables which pass different EMC r
anges, may not be opened at the termi-
nals, because the screening attenuation other
wise decreases highly. They must, lead
to the next module without interruption.
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