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User´s Guide Power Rail Booster Version 12/2005

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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Siemens 6ES7 972-4AA02-0XA0 User Manual

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