Preferred Arrangement Of The Contact Conductors - Siemens 6ES7 972-4AA02-0XA0 User Manual

User´s Guide Power Rail Booster
contact elements in this transition path (contactors, switches, terminals, sliding
contacts, etc.).
Depending on the existing ambient conditions, contamination and oxidation of the
contact rails, particularly those made of copper (alloys), must always be reckoned
with in all contact rail systems, although the constant travel of sliding contacts over a
contact rail does have a certain self-cleaning effect. Particular attention must be paid
to maintenance on those sections over which there is little travel, such as servicing
areas, sidings, out-of-the-way areas and so on.
It is therefore of the utmost importance that maintenance and cleaning be sufficiently
frequent so as not to endanger problem-free data transmission through
contaminated or oxidized contact rails, sliding contacts or switching contacts.
5.4.4

Preferred Arrangement of the Contact Conductors

For optimizing immunity to interference, it is advisable to arrange the contact
conductors as follows:
•
Maximum distance between the contact conductors for Power Rail (A, B) and
the contact conductors for protective earth and power (PE, L1, L2, L3).
•
Lay the contact conductor for PE between the contact conductors for the
phases and the Power Rail
•
Minimum distance between the two contact conductors for Power Rail A and B
•
To avoid contamination due to abrasion, you must mount contact conductors
for the Power Rail above the other contact conductors and slightly offset the
rail sections
Fig. 15: Preferred arrangement of the contact conductors
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6ES7 972-4AA02-0XA0
Version 12/2005
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