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Interference Sources; Interference Sinks - Siemens SIROTEC Planning Manual

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Interference Spreading

3.1 Interference sources

The initiator of the interference is described as the interference source. The noise
levels generated by the interference sources or their effects must be eliminated or
at least dampened by appropriate measures.
Table 3-1
Typical interference sources and their effects on interference sinks
Interference source
Switched inductors such as e.g.
contactors, relays, electronic valves
Electrical motors
Sparking machines such as
e. g. electrical welding equipment,
electrical discharge machines
Power supply units
High-frequency appliances
Transmitters
Earth or reference potential
differences
Operator
Power lines
Transmission lines
Current converters, power electronics - Circuits

3.2 Interference sinks

An interference sink is an electrical device, whose function can be influenced by
interference sizes.
Table 3-2
Typical interference sinks and their reaction on interferences
Interference sinks
Microprocessor-controlled
systems, bus systems
Analog circuits
Electron beam monitors
Telephones
Fax machines, power
supply units
3-16
Interference generated
by...
- Contacts
- Coils
- Collectors
- Coils
- Contacts
- Transformers
- Circuits
- Switching components
- Circuits
- Antennas
- Voltage differences
- Discharges of static
electricity
- Current flows
- Fuse cases
- Voltage differences
- Corona discharges
are sensitive against...
Pulse-shaped noise levels (e.g.
switching operations) and
electromagnetic fields
Low-frequency noise levels (e.g.
potential differences)
low-frequency magnetic fields
(> 1.5 A/m)
Mains second harmonics
Mains second harmonics
EMC Installation Guideline – Planning Guide (EMV) – 03.2004 Edition
Effect
- System disturbances
- Electromagnetic fields
- Magnetic fields
- Electromagnetic fields
- Magnetic fields
- Electromagnetic fields
- System disturbances
- Compensating currents
- Magnetic fields
- Electromagnetic fields
- System disturbances
- Electromagnetic fields
- Electromagnetic fields
- Compensating currents
- Electrical discharge currents
- Electrical fields
- Power break-ins, power
overvoltages
- Electrical and magnetic fields
- Electromagnetic fields
- Electrical fields
- Overvoltages
- Compensating currents
Reaction
Sporadic processor shutdown,
transmission errors
Superimposition of the effective signal
on the noise level (e.g. 50 Hz hum on
setpoint)
Flickering screen or image, colour
distortion
Whistling is audible
Fuse case or defect in the power supply
unit, whistling is audible
© Siemens AG, 2004. All rights reserved

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