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Basic Rules - Siemens SIMATIC RF300 System Manual

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4.7.3

Basic rules

It is often sufficient to follow a few elementary rules in order to ensure electromagnetic
compatiblity (EMC).
The following rules must be observed:
Shielding by enclosure
● Protect the device against external interference by installing it in a cabinet or housing.
● Use metal plates to shield against electromagnetic fields generated by inductances.
● Use metal connector housings to shield data conductors.
Wide-area ground connection
● Bond all passive metal parts to chassis ground, ensuring large-area and low-HF-
● Establish a large-area connection between the passive metal parts and the central
● Don't forget to include the shielding bus in the chassis ground system. That means the
● Aluminium parts are not suitable for ground connections.
Plan the cable installation
● Break the cabling down into cable groups and install these separately.
● Always route power cables, signal cables and HF cables through separated ducts or in
● Feed the cabling into the cabinet from one side only and, if possible, on one level only.
● Route the signal cables as close as possible to chassis surfaces.
● Twist the feed and return conductors of separately installed cables.
● Routing HF cables:
● Do not route cables through the antenna field.
Shielding for the cables
● Shield the data cables and connect the shield at both ends.
● Shield the analog cables and connect the shield at one end, e.g. on the drive unit.
● Always apply large-area connections between the cable shields and the shielding bus at
● Feed the connected shield through to the module without interruption.
● Use braided shields, not foil shields.
SIMATIC RF300
System Manual, 01/2009, A5E01642529-03
The housing or enclosure must be connected to the chassis ground.
impedance contact.
grounding point.
actual shielding busbars must be connected to ground by large-area contact.
separate bundles.
avoid parallel routing of HF cables.
the cabinet inlet and make the contact with clamps.
RF300 system planning
4.7 EMC Directives
81

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