Emc Precautions - GE ecomagination Profibus DP AF-650 GP Instruction Manual

The numbers on the following diagram indicate the maximum number of stations in each segment. They are not the station addresses, as each station in the
network must have a unique address.
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2.1.2 EMC Precautions

The following EMC precautions are recommended to achieve interference-free operation of the PROFIBUS network. Additional EMC information is available in
the AF-6 series Instruction Manual and Design Guides
NOTE
Ensure compliance with relevant national and local regulations, for example in protective ground connection.
2.1.3 Connection of the Cable Shield
The shield of the PROFIBUS cable must always be connected to ground at both ends, meaning the shield must be connected to ground in all stations connec-
ted to the PROFIBUS network. It is very important to have a low impedance ground connection of the shield, also at high frequencies. This can be obtained by
connecting the surface of the shield to ground, for example by means of a cable clamp or a conductive cable connector. The adjustable frequency drive has
various clamps and brackets to enable a proper ground connection of the PROFIBUS cable shield. The shield connection is shown in the section Connecting the
Network.
2.1.4 Ground Connection
It is important that all stations connected to the PROFIBUS network are connected to the same ground potential. The ground connection must have a low HF
(high frequency) impedance. This can be achieved by connecting a large surface area of the cabinet to ground, for example, by mounting the adjustable fre-
quency drive on a conductive rear plate. Particularly when there are long distances between the stations in a PROFIBUS network, it can be necessary to use
additional potential equalizing cables, connecting the individual stations to the same ground potential.
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AF-650 GP/AF-600 FP Profibus DP Instruction Manual
DET-624