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