Electromagnetic
compatibility (EMC)
95
02/11 MN05006002Z-EN
Electromagnetic
compatibility (EMC)
The system SmartWire-DT conforms to requirements of the
EMC guidelines. However, EMC planning is required prior to
installation. All potential interference sources, such as
galvanic, inductive and capacitive couplings as well as radi-
ation couplings should be taken into consideration.
The EMC of the system SmartWire-DT is ensured when the
following rules are observed:
• Proper and extensive earthing of the inactive metal parts
• Proper cable routing and wiring
• The creation of a uniform reference potential and the
earthing of all electrical resources
• Special EMC measures for special applications
Earthing of inactive parts
All inactive parts (control panels, panel doors, support rails,
mounting plates, top-hat rails, etc.) must be connected to
each other (earthing) with a large-area, low-impedance
connection. This ensures a uniform reference potential for all
control elements and decreases the influence of coupled
interference.
• With painted, anodized or insulated metal parts the insu-
lating layer must be removed in the screw connection
area. The connection point must be protected against
corrosion.
• Any moving earthed parts (cabinet doors, separate
mounting plates etc.) must be connected with short earth
straps with a large surface area.
• The use of aluminium should be avoided where possible as
aluminium oxidizes and is then not suitable for earthing.
j
Danger!
Ground must never carry a dangerous touch voltage – not
even in the case of a malfunction. The earth must there-
fore be connected to the protective conductor.
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