User´s Guide Power Rail Booster
Version 12/2005
Copyright
©
Siemens AG 2005 All rights reserved.
6ES7 972-4AA02-0XA0
Page 33 of 49
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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