Electrical installation
EMC−compliant wiring
6
30
Lenze ¯ BA_p500 ¯ 3.0
6.2
EMC−compliant wiring
Notes on EMC−compliant wiring
General notes
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The electromagnetic compatibility of the system depends on the type of installation
and care taken. Especially consider the following:
– Structure
– Shielding
– Earthing
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For installations differing from the one described, the evaluation of the conformity
with the EMC Directive requires a check of the system regarding the EMC limit
values. This for instance applies to:
– Use of unshielded cables
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The compliance with the EMC Directive is in the responsibility of the user.
– If you observe the following measures, you can assume that no EMC problems will
occur during operation and that compliance with the EMC Directive and the EMC
law is achieved.
– If devices which do not comply with the CE requirement concerning noise
immunity (EN 6100042) are operated close to the system, these devices may be
electromagnetically affected by the system.
Structure
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Provide electrical contact between the device and the earthed mounting plate:
– Mounting plates with conductive surfaces (zinc−coated, stainless steel) allow
permanent contact.
– Painted plates are not suitable for an EMC−compliant installation.
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If you use several mounting plates:
– Connect as much surface of the mounting plates as possible (e.g. with copper
strips).
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When laying the cables, pay attention to the separation of signal cables and mains
cables.
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Lay the cables as close as possible to the reference potential. Freely suspended cables
act like aerials.
Shielding
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Only use cables with braids if possible.
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The overlap rate of the shield should be higher than 80%.
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For data cables for serial connection, always use metal or metallised connectors.
Connect the shield of the data cable to the connector shell.
Earthing
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Earth all metallically conductive components using suitable cables connected to a
central earthing point (PE bar).
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Maintain the minimum cross−sections prescribed in the safety regulations:
– For the EMC, not the cable cross−section is important, but the surface and the
contact with a cross−section as large as possible, i.e. large surface.
