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GBM-8
7. Performing a functional check
It is recommended to perform a functional test before installing the
GBM-8 into the layout. Test the module with a small auxiliary circuit.
The required components are included in the package.
Follow the connections diagram "Testing layout" and the list
"Assignment of the booster sections or transformers and the rail
sections to the GBM-8" in section 8. There are terminal strips soldered
to the module which are used to insert and screw on the connecting
cables.
Test for rail section 1
GBM-8
Connection to
V1a, V1b and M
Transformer
A1
Auxiliary circuit made of:
LED, series resistor
1
k
W
and damping diode.
Observe the polarity of the LED and the damping
diode! With wired LEDs the longer lead is always
the anode (positive pole). The negative end of the
damping diode is marked with a ring.
G1 and V1a
Resistor 1 k
W
→
simulation of a load in the
supervised rail section 1
After connecting the transformer with the power supply, the LED
should light. Disconnect the connection between G1 and the resistor,
the LED should go out.
Repeat the test for all other track sections. Be sure to connect the
connections for the power supply, the rails and the output, which are
assigned to each other (e.g. V3a, V3b, G5 and A5).
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