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Electrical installation

EMC−compliant wiring

Lenze ¯ BA_3241C ¯ 4.0

6.2 EMC−compliant wiring

Notes on EMC−compliant wiring

General notes ¯ The electromagnetic compatibility of the system depends on the type of installation

and care taken. Especially consider the following:

– Structure

– Shielding

– Earthing

¯ 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

¯ 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 ¯ Provide electrical contact between the DIN rail and the earthed mounting plate:

– Mounting plates with electrically conductive surfaces (zinccoated or stainless steel)

allow permanent contact.

– Painted plates are not suitable for an EMCcompliant installation.

¯ If you use several mounting plates:

– Connect as much surface of the mounting plates as possible (e.g. with copper

strips).

¯ When laying the cables, pay attention to the separation of signal cables and mains

cables.

¯ Lay the cables as close as possible to the reference potential. Freely suspended cables

act like aerials.

Shielding ¯ Only use cables with braided shield if possible.

¯ The overlap rate of the shield should be higher than 80%.

¯ For data cables for serial connection, always use metal or metallised connectors.

Connect the shield of the data cable to the connector shell.

Earthing ¯ Earth all metallically conductive components using suitable cables connected to a

central earthing point (PE bar).

¯ Keep to the minimum crosssections defined in the safety instructions:

– For EMC not the cable crosssection is important, but the surface of the cable and

the contact with a crosssection as large as possible, i.e. large surface.

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Lenze 3200 C Bedienungsanleitung Seite 29