Filtration
© Siemens AG, 2004. All rights reserved
EMC Installation Guideline – Planning Guide (EMV) – 03.2004 Edition
7-47
Wiring
· Supply lines and shunts to the filter are to be routed with spatial separation.
· Power and signal lines must basically be conducted separately. For this, the
power lines from the converter must be conducted functionally downwards and
the transmitter lines upwards, to achieve as large a spatial distance as possible
(see also Chapter 6 for this).
· To comply with the radio interference thresholds, it is necessary to create all
motors and main lines with shielding. Optionally, an earthed metal channel with
an electrically extensive contacted cover may be used. The extensive link of the
shielding to the appropriate components (motor, converter) must always be
ensured.
Functional earthing
The extensive conducting assembly of the filter in the cabinet provides the
functional earthing. If only a more or less insulated installation is possible, then the
functional earthing must be provided via an equipotential bonding conductor.
Protection earthing
Basically, the regulations for protection earthing also apply. However, additional
measures are necessary for converters due to the high deflection currents.
Caution
According to EN 50178, only currents ≤ AC 3.5 mA or ≤ DC 10 mA may flow to a
conductor. As the interference currents of current converter-filters normally
exceed these values, the following measures must be performed:
1. Laying of a second conductor via separated clamps parallel to the current
conductor, whereby this equipotential bonding conductor must likewise meet
the requirements for conductors according to IEC 364-6-543.
2. Use of a conductor with a cross-section ≥ 10mm
2
Cu.
!
Warning
Unused cores of power lines (e.g. brake cores) and their line shields must be
installed on at least one side to the earthing potential in order to discharge the
loads arising through capacitive overcoupling. Hazardous contact voltages on the
unearthed shields and cores may arise if this warning is disregarded.
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