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Filtration

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

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.

Siemens SIROTEC Planning Guide

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