For lacquered or coated back walls, an adequate connection is only guaranteed if the screw has
been threaded into the back wall. If this is not the case, a contact washer must be must be placed
between the fastening nut and the back wall.
For most applications, industrial controllers are installed in switching cabinets, in which
electromagnetic switching elements (relays, contactors), transformers, motor controllers and
frequency inverters are also found. Different kinds of electromagnetic interference inevitably
exists in such switching cabinets.
Generally this kind of interference cannot be avoided. However, if suitable grounding, shielding
and other protective measures are taken, the negative influence of the devices can be
considerably reduced. These protective measures include control cabinet grounding module
grounding, cable shield grounding, protective circuits on electromechanical switching elements,
and correct use of cables (choosing the proper cable cross section and type)
Grounding has essentially two different functions:
• Protective grounding
• Dissipation of electromagnetic disturbances
The grounding measures depend on whether the module is mounted directly to the back wall of
the switching cabinet or on the mounting rail.
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