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Installation Guidelines
Basic rules for the EMC-equitable assembly of installations
Coupling mechanism
Galvanic coupling
Capacitate coupling
Inductive coupling
Radiate power coupling
70
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 propor-
tionate to the temporal change of the
voltage.
Inductive or magnetic coupling occurs
between two current active line loops.
The magnetic flows associated with
the currents induct interference vol-
tages. The coupling is proportional to
the time related change of the current.
One talks of radiate power coupling,
when an electromagnetic wave meets
a line circuit. The hit of the wave
inducts currents and voltages.
Typical source
n
Pulsed devices (Net influence from
transducers and foreign net
devices)
Starting motors
n
Different potential of component
n
cubicles with common current
supply
n
Static discharges
n
Interference through parallel signal
lines
n
Static discharge of the personnel
n
Contactors
n
Transducers, motors, electric
welding devices
n
Parallel net cables
Cables with toggled currents
n
n
Signal cable with high frequency
n
Unused coils
Sender in the neighbourhood (e.g.
n
walkie-talkie)
n
Sparking lines (sparking plugs,
collector of electric motors,
welding devices)
HB160 | TP-ECO | 62H-MHC0 | en | 17-01
VIPA HMI
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