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Manual VIPA HMI
Coupling
mechanisms and
interference
sources
Coupling mechanism
Galvanic coupling
Disruptor
galvanic
coupling line
Automation
System
Capacitate coupling
Disruptor
capacitive
coupling line
Automation
System
Inductive coupling
Disruptor
wanted signal
Automation
System
Radiate power coupling
Disruptor
Automation
System
HB160E - TP - RE_606-1BC40 - Rev. 08/13
The following table shows the four different coupling mechanisms, their
causes and possible interference sources.
Cause
Galvanic or metallic coupling
always occurs when two
current circuits have a
common line.
Capacitate or electric coupling
occurs between conductors
with different potential.
The coupling is proportionate
to the time wise change of the
voltage.
Inductive or magnetic coupling
occurs between two current
active line loops.
The magnetic flows associated
with the currents induct
interference voltages.
inductive
The coupling is proportional to
coupling
line
the time related change of the
current.
One talks of radiate power
coupling, when an electro-
magnetic wave meets a line
circuit.
The hit of the wave inducts
currents and voltages.
radiated
coupling
line
Chapter 3 Installation Guidelines
Typical source
• Pulsed devices
(Net influence from
transducers and foreign net
devices)
• Starting motors
• Different potential of
component cubicles with
common current supply
• Static discharges
• Interference through parallel
signal lines
• Static discharge of the
personnel
• Contactors
• Transducers, motors,
electric welding devices
• Parallel net cables
• Cables with toggled currents
• Signal cable with high
frequency
• Unused coils
• Sender in the neighborhood
(e.g. walkie-talkie)
• Sparking lines
(sparking plugs, collector of
electric motors, welding
devices)
3-3
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