Fig.14-8:
Correct connection of a compact line filter
When connecting line filters, attention should first be paid to the frequency
ranges to be filtered. If frequencies in the MHz range are also to be filtered,
such a line filter should have a metal housing. Line filters with plastic housings
are normally not suitable for this purpose.
Current-compensating chokes
Device manufacturers sometimes specify the use of current-compensating
chokes or the installation of ferrite loops in the power supply line. Many exam-
ples of this can be found in motor lines that are fed by frequency inverters.
Such chokes (see the following illustrations) suppress common-mode inter-
ference currents (I
s
) and allow the operating currents (I
B
) to pass unhindered.
It should be noted that the operating currents in the core produce self-cancel-
ling magnetic fields so that the operating current does not saturate the ferrite
cores. Such throttles must also be placed at the inlet to the shielded housing
of the device.
Fig.14-9:
Current flow of a current-compensating choke
I
S
... Interference current
I
B
... Operating current
1
... Power supply lines
2
... Ferrite hoop
CE Conformity, Directives and Standards
KeTop T50VGA
© KEBA 2009
User's Manual V1.50
148
Summary of Contents for KeTop T100
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