User manual

English GBM-8
Page 32
Performing a visual check
Perform a visual check after the assembly of the module and remove
faults if necessary:
§ Remove all loose parts, wire ends or drops of solder from the PCB.
Remove all sharp wire ends.
§ Check that solder contacts which are close to each other are not
unintentionally connected to each other. Risk of short circuit!
§ Check that all components are polarised correctly.
When you have remedied all faults, go on to the next part.
Performing a functional check
It is recommended to perform a functional test after mounting the
GBM-8 and before installing it into the layout. In order to simulate a
load in a supervised section, use a resistor. A small auxiliary circuit
made of a LED, a series resistor 1K and a damping diode, is used to
display the busy status. The required components are included in the
package.
Follow the connections diagram fig. 3 and the list in section 7. First,
make the following connections in order to check if the GBM-8 properly
detects and displays the busy status:
1. model railway transformer à connections V1a, V1b and M
2. auxiliary circuit à connections A1 and V1a
3. resistor 1K à connections G1 and V1a
Caution:
Never connect electric light bulbs to the outputs as these consume
more than 50 mA current, as a rule. The outputs which are designed
for a maximum current of 50 mA would be destroyed when putting
them into operation.
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.
!