tams elektronik GBM-8 Manual page 21

GBM-8
Connecting the power supply
Each pair of connections for the rails is assigned to one connection for
the power supply.
Connect the connections for the power supply of the GBM-8 (V1a and
V1b or V2a and V2b etc.) to the rail outputs of the driving transformer
(in analogue layouts) or the rail outputs of the boosters (in digital
layouts).
As the need arises, you can connect the connections for the power supply
(V1, V2, V3, V4) either in parallel to the rail outputs of one booster or
transformer or to maximum four different transformers or boosters.
Caution: If you use a d.c. transformer as a driving transformer,
!
you generally have to respect the polarity when connecting it. If using
an a.c. transformer the polarity is of no importance.
Connecting the rail sections
The busy status can only be reported trouble free, when with each
supervised section one conductor is isolated at both ends:

3-rail systems: middle conductor or both rails;

2-rail systems (analogue): "-"-rail;

2-rail systems (digital): one of the two rails.
Pay attention to the fact that, due to technical principles, in analogue 2-
rail systems only vehicles driving into the track section in one particular
direction are detected.
GBM-8
G1, G2, G3, ... G8
V1a, V2a, V3a, V4a rail conductor which has not been isolated
Be sure to use the connections for the power supply and the rails
which are assigned to each other (e.g. V3a and G5 and G6).
Page 21
Connection to
isolated conductor of the supervised rail sections
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