Siemens SIMATIC RF685R - Page 90

RF600 system planning
4.9 Guidelines for electromagnetic compatibility (EMC)
SIMATIC RF600
90 System Manual, 11/2018, J31069-D0171-U001-A21-7618
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- 15 Interference sources: origin and effect
Interference source
Interference results from
Effect on the interference sink
Contactor,
electronic valves
Contacts
System disturbances
Coils Magnetic field
Electrical motor
Collector
Electrical field
Winding Magnetic field
Electric welding device
Contacts
Electrical field
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. professional mobile
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