Electromagnetic Compatibility (EMC)
3-2 Installation Manual: PSS 3056 Series
• Capacitive (electrical) coupling
A different potential between the source and interference sink (e.g. two
cables) creates an electrical field. Cross-coupling is proportional to the
rate of voltage change.
Possible sources of interference are contactors, static discharge, parallel
signal cables.
• Inductive (magnetic) coupling
A live cable produces a magnetic field which surrounds both the live and
neighbouring cables. Interference voltage is induced. Cross-coupling is
proportional to the rate of current change.
Possible sources of interference are mains cables running in parallel, live
cables, high frequency cables, inductors, transformers, motors.
• Electromagnetic coupling
A cable can emit a signal as a radio wave. This wave is then picked up
by another cable.
Possible sources of interference are transmitters such as radios, sparks
from spark plugs, welding equipment etc.
NOTICE
Stronger HF transmitters should only be operated at a distance of more
than 0.6 m.
• Static discharge
Static discharge occurs where there are very high differences in potential
between two points. If the two points are brought closer together or if the
potential difference is increased, discharges can occur in the air gaps.
Possible sources of interference are people who are statically charged
from a synthetic carpet, for example.
Making the installation EMC-compatible
Connecting the earth cables
PSS safety systems all meet protection class 1 (DIN VDE 0106, Part 1/A1,
04/90). The prescribed earth points are designed for your safety and to
guarantee compliance with noise resistance requirements.
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