Planning the MOBY D system
4.5 EMC Guidelines
MOBY D
72 System Manual, 01/2010, J31069-D0147-A6-7618
Interference sources
In order to achieve a high level of electromagnetic compatibility and thus a very low level of
disturbance in a plant, it is necessary to recognize the most frequent interference sources.
These must then be eliminated by appropriate measures.
Table 4- 25 Interference sources: origin and effect
Interference source Interference results from Effect on the interference sink
Contacts System disturbances Contactors,
electronic valves
Coils Magnetic field
Collector Electrical field Electrical motor
Winding Magnetic field
Contacts Electrical field Electric welding device
Transformer Magnetic field, system disturbance,
transient currents
Power supply unit, switched-
mode
Circuit Electrical and magnetic field, system
disturbance
High-frequency appliances Circuit Electromagnetic field
Transmitter
(e.g. service radio)
Antenna Electromagnetic field
Ground or reference potential
difference
Voltage difference Transient currents
Operator Static charge Electrical discharge currents, electrical
field
Power cable Current flow Electrical and magnetic field, system
disturbance
High-voltage cable Voltage difference Electrical field
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