General information
Instruction handbook Mains filters
BFN
Document No.: 5.09010.03
Baumüller Nürnberg GmbH
36
4.1
4.1.1
Functional description
The resulting impedance of the parts used in the filters leads to an optimum mismatch
between the mains- and the load impedance. Now the interference-current can return to
its interference source. The dropping harmonic voltages at the impedance of the system
can be reduced substantially between the frequency range 150 kHz ... 30 MHz .
4.1.2
Block diagram filters for mains applications (simplified)
Power supply
Load
Figure 10:
Block diagram
WARNING!
Filters cause high discharge currents and are incompatible, if they have RCDs. The
notes of EN 50178 must be considered when configuring. Due to the high discharge
currents the cross-section of the ground conductors at the filter must be at least 10
mm
2
(EN 50178, chapter 5.3.2.1). The grounding conductor must be connected to
the filter before commissioning.
NOTE!
In order to return the interference current with low impedance to its interference
source, mounting must be made on a conductive mounting plate (mounting of the
mains filter and of the power converter, which must be cleared and of the bonded
face-to-face contacting of the motor cable screen). The use of unvarnished mounting
plates provides the best results.
Summary of Contents for BFN 3-1 Series
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