GE Industrial Solutions AF-600 FP Profibus DP - Manual (Page 12)

2.1.4 Earth Connection
It is important that all stations connected to the PROFIBUS network are connected to the same earth potential. The earth connection must have a low HF (high
frequency) impedance. This can be achieved by connecting a large surface area of the cabinet to earth, for example by mounting the frequency converter 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 earth potential.
2.1.5 Cable Routing
The PROFIBUS communication cable must be kept away from motor and brake resistor cables to avoid coupling of high frequency noise from one cable to the
other. Normally a distance of 200 mm is sufficient, but maintaining the greatest possible distance between cables is generally recommended, especially where
cables run in parallel over long distances.
If the PROFIBUS cable must cross a motor cable or brake resistor cable, the cables must cross at an angle of 90°.
AF-650 GP/AF-600 FP Profibus DP Operating Instructions
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