Basics and Assembly
22
Wieland Electric GmbH | BA000941 | 01/2014 (Rev. A)
•
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 (for details see below).
−
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 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 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 erase links, which are not addressed by the system ricos
FLEX modules.
−
For lightening cabinets you should 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 ricos FLEX 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
Electrical, magnetically and electromagnetic interference fields are weakened by means of
an isolation, one talks of absorption.
Via the isolation rail, that is connected conductive with the rack, interference currents are
shunt via cable isolation to the ground. Hereby you have to make sure, that the connection
to the protected earth conductor is impedance-low, because otherwise the interference
currents may appear as interference cause.
When isolating cables you have to regard the following:
•
If possible, use only cables with isolation tangle.
•
The hiding power of the isolation should be higher than 80 %.
•
Normally you should always lay the isolation of cables on both sides. Only by means
of the both-sided connection of the isolation you achieve high quality interference
suppression in the higher frequency area.
Only as exception you may also lay the isolation one-sided. Then you only achieve
the absorption of the lower frequencies. A one-sided isolation connection may be
convenient, if:
−
the conduction of a potential compensating line is not possible
−
analog signals (some mV res. µA) are transferred
−
foil isolations (static isolations) are used.
•
With data lines always use metallic or metalized plugs for serial couplings. Fix the
isolation of the data line at the plug rack. Do not lay the isolation on the PIN 1 of the
plug bar!
•
At stationary operation it is convenient to strip the insulated cable interruption free
and lay it on the isolation/protected earth conductor line.
•
To fix the isolation tangles use cable clamps out of metal. The clamps must clasp the
isolation extensively and have well contact.
•
Lay the isolation on an isolation rail directly after the entry of the cable in the cabinet.
Lead the isolation further on to the System
ricos
FLEX module and don't lay it on
there again!
Isolation of
conductors
