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Manual VIPA System 300S
Isolation of
conductors
HB140E - IM - RE_353-1DP01 - Rev. 14/47
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 conduc-
tor 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 300S module
and don't lay it on there again!
Please regard at installation!
At potential differences between the grounding points, there may be a
compensation current via the isolation connected at both sides.
Remedy: Potential compensation line
Chapter 1 Assembly and installation guidelines
1-9
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