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User´s Guide Power Rail Booster Version 12/2005

6.4 Determining the Transfer Resistance of Collectors

The transfer resistors for the collectors, a major factor in total resistance, can be

determined in the following ways.

6.4.1.1 Measuring individual resistances

Individual resistances can be measured by determining the resistance between

sliding contacts and contact rail on a vehicle which is stationary and has been

switched off using a hand-held multimeter. If necessary, sliding contacts and/or

contact rail must be disconnected from the Power Rail Boosters.

The following applies to the resistors measured:

Æ R measurement ≤ 100 ohms

6.4.1.2 Measuring the series resistances on individual double sliding contacts

In order to measure the transfer resistances on a moving vehicle, a pair of double

sliding contacts can be used as substitute:

Fig. 26: Measuring the series resistances on individual double sliding contacts

The following applies to resistors R1+R2 measured via the two double sliding

contacts:

Æ (R1+R2)/4 ≤ 100 ohms

6.4.1.3 Measuring the serial resistances on both double sliding contacts

In order to measure the transfer resistances on a moving vehicle, measure the

resistance over the entire series connection of double sliding contacts. Before doing

so, all Power Rail Boosters on the segment to be measured must be disconnected.

Fig. 27: Measuring the series resistances on both double sliding contacts

The following applies to the resistance ( R ) measured via both double sliding

contacts:

Æ R ≤ 100 ohms

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

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