Lenze I/O system 1000 System Manual - Manual (Page 245)

Electrical installation
Wiring according to EMC
6
l
245 EDSIO1000 EN 7.0
6 Electrical installation
6.1 Wiring according to EMC
General notes l The electromagnetic compatibility of the system depends on the type of installation and care
taken. Especially consider the following:
– Assembly
– Shielding
– Earthing
l 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
l 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.
Assembly l Provide electrical contact between the DIN rail and the earthed mounting plate:
– Mounting plates with electrically conductive surfaces (zinc−coated or stainless steel) allow
permanent contact.
– Painted plates are not suitable for an EMC−compliant installation.
l If you use several mounting plates:
– Connect as much surface of the mounting plates as possible (e.g. with copper strips).
l When laying the cables, pay attention to the separation of signal cables and mains cables.
l Lay the cables as close as possible to the reference potential. Freely suspended cables act like
aerials.
Shielding l Only use cables with braided shield if possible.
l The overlap rate of the shield should be higher than 80%.
l For data cables for serial connection, always use metal or metallised connectors. Connect the
shield of the data cable to the connector shell.
Earthing l Earth all metallically conductive components using suitable cables connected to a central
earthing point (PE bar).
l Keep to the minimum cross−sections defined in the safety instructions:
– For EMC not the cable cross−section is important, but the surface of the cable and the
contact with a cross−section as large as possible, i.e. large surface.