n 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 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 impedance-low with the cabinet.
– Use metallic or metallised plug cases for isolated data lines.
n In special use cases you should appoint special EMC actions.
– Consider to wire all inductivities with erase links.
– Please consider luminescent lamps can influence signal lines.
n Create a homogeneous reference potential and ground all elec-
trical operating supplies when possible.
– Please take care for the targeted employment of the grounding
actions. The grounding of the PLC serves for protection and
functionality activity.
– Connect installation parts and cabinets with your PLC in star
topology with the isolation/protected earth conductor system.
So you avoid ground loops.
– If there are potential differences between installation parts and
cabinets, 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. Here 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:
n If possible, use only cables with isolation tangle.
n The hiding power of the isolation should be higher than 80%.
n 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 fre-
quencies. A one-sided isolation connection may be convenient, if:
–
the conduction of a potential compensating line is not possible.
– analog signals (some mV respectively µA) are transferred.
– foil isolations (static isolations) are used.
n With data lines always use metallic or metallised 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!
n At stationary operation it is convenient to strip the insulated cable
interruption free and lay it on the isolation/protected earth con-
ductor line.
Isolation of conductors
VIPA System 300S Assembly and installation guidelines
Installation guidelines
HB140 | CPU | 314-6CF03 | GB | 16-43 29
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