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Assembly and installation guidelines
Installation guidelines
What does EMC mean?
Possible interference
causes
Basic rules for EMC
20
Electromagnetic compatibility (EMC) means the ability of an electrical device, to function
error free in an electromagnetic environment without being interfered respectively without
interfering the environment.
The components of VIPA are developed for the deployment in industrial environments
and meets high demands on the EMC. Nevertheless you should project an EMC planning
before installing the components and take conceivable interference causes into account.
Electromagnetic interferences may interfere your control via different ways:
n
Electromagnetic fields (RF coupling)
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Magnetic fields with power frequency
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Bus system
n
Power supply
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Protected earth conductor
Depending on the spreading medium (lead bound or lead free) and the distance to the
interference cause, interferences to your control occur by means of different coupling
mechanisms.
There are:
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galvanic coupling
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capacitive coupling
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inductive coupling
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radiant coupling
In the most times it is enough to take care of some elementary rules to guarantee the
EMC. Please regard the following basic rules when installing your PLC.
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Take care of a correct area-wide grounding of the inactive metal parts when installing
your components.
–
Install a central connection between the ground and the protected earth conductor
system.
–
Connect all inactive metal extensive and impedance-low.
–
Please try not to use aluminium parts. Aluminium is easily oxidizing and is there-
fore less suitable for grounding.
When cabling, take care of the correct line routing.
n
–
Organize your cabling in line groups (high voltage, current supply, signal and data
lines).
–
Always lay your high voltage lines and signal respectively data lines in separate
channels or bundles.
–
Route the signal and data lines as near as possible beside ground areas (e.g.
suspension bars, metal rails, tin cabinet).
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Proof the correct fixing of the lead isolation.
–
Data lines must be laid isolated.
–
Analog lines must be laid isolated. When transmitting signals with small ampli-
tudes the one sided laying of the isolation may be favourable.
–
Lay the line isolation extensively on an isolation/protected earth conductor rail
directly after the cabinet entry and fix the isolation with cable clamps.
–
Make sure that the isolation/protected earth conductor rail is connected impe-
dance-low with the cabinet.
–
Use metallic or metallised plug cases for isolated data lines.
VIPA System 300S
HB140 | SM-DIO | | en | Rev. 16-43
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