GE Industrial Solutions AF-650 GP DeviceNet - Manual (Page 9)

2.1.3 EMC Precautions
The following EMC precautions are recommended in order to achieve interference-free operation of the DeviceNet network. Additional EMC information is available
in the relevant AF-600 FPAF-650 GP or AF-600 FP Operating Instructions.
NB!
Relevant national and local regulations, for example regarding protective earth connection, must be observed.
The DeviceNet 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 (8 inches) is sufficient, but it is generally recommended to keep the greatest possible distance between the cables, especially
where cables run in parallel over long distances. If the DeviceNet cable has to cross a motor and brake resistor cable they must cross each other at an angle of
90 degrees.
2.1.4 Connection of the Cable Screen
GE recommends connection of the screen of the DeviceNet cable to ground at both ends of the cable at every DeviceNet station (see GE recommendation for
further details). Low impedance ground connection of the screen is very important, also at high frequencies. Achieve this by connecting the surface of the screen
to ground, for example by means of a cable clamp or a conductive cable gland. The frequency converter package includes various clamps and brackets to enable
a proper ground connection of the DeviceNet cable screen. The screen connection required for CE and EMC compliance is shown in the following drawing.
2.1.5 ODVA Recommendation
The Screen must be connected to ground at only one point on the network.
NB!
Please note that this recommendation conflicts with the correct EMC in-
stallation.
AF-600FP /650 GP DeviceNet Operating Instructions
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