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.
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Install a central connection between the ground and the protected earth conductor
system.
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Connect all inactive metal extensive and impedance-low.
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Please try not to use aluminium parts. Aluminium is easily oxidizing and is there-
fore less suitable for grounding.
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When cabling, take care of the correct line routing.
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Organize your cabling in line groups (high voltage, current supply, signal and data
lines).
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Always lay your high voltage lines and signal respectively data lines in separate
channels or bundles.
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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.
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Data lines must be laid isolated.
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Analog lines must be laid isolated. When transmitting signals with small ampli-
tudes the one sided laying of the isolation may be favourable.
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Lay the line isolation extensively on an isolation/protected earth conductor rail
directly after the cabinet entry and fix the isolation with cable clamps.
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Make sure that the isolation/protected earth conductor rail is connected impe-
dance-low with the cabinet.
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Use metallic or metallised plug cases for isolated data lines.
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In special use cases you should appoint special EMC actions.
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Consider to wire all inductivities with erase links.
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Please consider luminescent lamps can influence signal lines.
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Create a homogeneous reference potential and ground all electrical operating sup-
plies when possible.
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Please take care for the targeted employment of the grounding actions. The
grounding of the PLC serves for protection and functionality activity.
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Connect installation parts and cabinets with your PLC in star topology with the
isolation/protected earth conductor system. So you avoid ground loops.
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If there are potential differences between installation parts and cabinets, lay suffi-
ciently dimensioned potential compensation lines.
Basic rules for EMC
VIPA HMI
Installation Guidelines
Basic rules for the EMC-equitable assembly of installations
HB160 | TP-ECO | 62E-MHC0 | en | 17-01
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