Determining The Transfer Resistance Of Collectors; Measuring Individual Resistances; Measuring The Series Resistances On Individual Double Sliding Contacts; Measuring The Serial Resistances On Both Double Sliding Contacts - Siemens 6ES7 972-4AA02-0XA0 User Manual

User´s Guide Power Rail Booster

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:
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:
(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:
R ≤ 100 ohms
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6ES7 972-4AA02-0XA0
Version 12/2005
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