Manual VIPA System 300S SPEED7 Chapter 2 Assembly and installation guidelines
HB140E - CPU SC - RE_313-6CF03 - Rev. 07/45 2-9
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.
• 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 aluminum parts. Aluminum is easily oxidizing
and is therefore less suitable for grounding.
• When cabling, take care of the correct line routing.
- Organize your cabling in line groups (high voltage, current supply,
signal and data lines).
- Always lay your high voltage lines and signal res. 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).
• 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 amplitudes the one sided laying of the isolation may be
favorable.
- Lay the line isolation extensively on an isolation/protected earth con-
ductor rail directly after the cabinet entry and fix the isolation with
cable clamps.
- Make sure that the isolation/protected earth conductor rail is
connected impedance-low with the cabinet.
- Use metallic or metalized plug cases for isolated data lines.
• In special use cases you should appoint special EMC actions.
- Wire all inductivities with suppressors, which are not addressed by
the System 300 modules.
- For lightening cabinets you should prefer incandescent lamps and
avoid luminescent lamps.
• Create a homogeneous reference potential and ground all electrical
operating supplies when possible.
- Please take care for the targeted employment of the grounding
actions. The grounding of the PLC is a protection and functionality
activity.
- Connect installation parts and cabinets with the System 300 in star
topology with the isolation/protected earth conductor system. So you
avoid ground loops.
- If potential differences between installation parts and cabinets occur,
lay sufficiently dimensioned potential compensation lines.
Basic rules for
EMC
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