Table of Contents
Advertisement
4 4 .10.3
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
Wide-area ground connection
Plan the cable installation
Shielding for the cables
SIMATIC RF600
System Manual, 06/2019, J31069-D0171-U001-A22-7618
Protect the device against external interference by installing it in a cabinet or housing.
The housing or enclosure must be connected to the chassis ground.
Use metal plates to shield against electromagnetic fields generated by inductances.
Use metal connector housings to shield data conductors.
Plan a meshed grounding concept.
Bond all passive metal parts to chassis ground, ensuring large-area and low-HF-
impedance contact.
Establish a large-area connection between the passive metal parts and the central
grounding point.
Don't forget to include the shielding bus in the chassis ground system. That means the
actual shielding busbars must be connected to ground by large-area contact.
Aluminium parts are not suitable for ground connections.
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
separate bundles.
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:
avoid parallel routing of HF cables.
Do not route cables through the antenna field.
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
the cabinet inlet and make the contact with clamps.
4.10 Guidelines for electromagnetic compatibility (EMC)
RF600 system planning
99
Advertisement
Table of Contents
