Connection Of The Track Sections; Connection To The Voltage Supply - tams elektronik GBM-1 Manual

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4.3. Connection of the track sections

Connect the isolated conductors of the monitored rail sections to the inputs (E1 to E4) of the
GBM-1.
Monitoring switched off track sections
Track sections to be cut off in operation (e.g. in a shadow station) can also be monitored with
the track busy indicator. For that purpose a resistor with a value between 1 kW und 4,7 kW
has to be mounted in the wire leading to the concerned track section so that it shunts the
switch when the track section is cut off (see connection diagrams on previous page,
connection to E4).

4.4. Connection to the voltage supply

Connect the ground connections of the supply transformer for the GBM and the driving
transformer to the ground connection of the track occupancy detector. The two ground
connections of the GBM-1 (^) are internally connected and can be used as required.
Caution:
!
The GBM-1 must not be supplied by transformers or a digital boosters providing current for
driving operation. In order to supply the GBM-1 you can use transformers or boosters which
supply other track busy indicators or lighting modules as well.
Caution:
!
If you use a d.c. transformer for the power supply of the GBM-1, you generally have to
respect the polarity when connecting it. If using an a.c. transformer the polarity is of no
importance first.
When connecting several outputs to circuits supplied by the same transformer, all
connections have to be polarized the same way as a rule. Otherwise a short circuit could
occur damaging connected devices.
Caution:
!
The ground of the driving transformer must not be connected to any of the four track
sections to be monitored, as the busy status could not be reported then.
Connecting the track busy indicator| 17
GBM-1