Electrically Conductive Ring Construction Inside The Machine - ABB Wireless Proximity Switches Planning And Installation Manuallines

Planning and
Installation Guidelines
V 6 Technical Description

1.7 Electrically conductive ring construction inside the machine

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Areas which are supplied
only one-dimensional
(in direction of the line)
Top view
Fig. 1.9: Attenuation of the magnetic field by electrically conductive ring constructions (example)
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Wireless Proximity Switches / Issue: 03.2005
Electrically conductive ring constructions inside a machine running in parallel to one of the
primary loop pairs lead to an attenuation of the electromagnetic field in their neighborhood. In
order to avoid such attenuations, all these ring constructions have to be electrically interrupted,
e.g. by the use of plastic parts.
Two-dimensional supplied
machine volume
Insufficiently supplied
area (white)
If any of the ring constructions mentioned above cannot be electrically interrupted by inserting
insulating plastic parts, one dimension of the electromagnetic field will be attenuated as shown
in fig. 1.9. If wireless proximity switches shall be used in this area, the second dimension of the
electromagnetic field around the place of installation must not be shielded or attenuated in any
other way.
Two metal ring
constructions
3D representation
Planning and Installation Guidelines 13