User manual

GBM-8 English
Page 35
supply of the LEDs but a separate transformer, for instance one used to
supply other lighting circuits.
When connecting the LEDs to an a.c. transformer, you should mount an
additional damping diode (e.g. 1N400x, x=2...7) and a capacitor with a
value between 10 and 100 µF and an electrical strength of minimum
25 V according to fig. 5.
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.
Caution:
Never use LEDs without series resistors, as in this case the LEDs will
be destroyed quickly. Apart from that the overcurrent resulting may
damage the opto-couplers on the module.
Connection to digital feed back modules
You can connect the inputs of digital feed back modules (e.g. s88-
modules) directly to the outputs of the GBM-8. Connect the earth
output of the feed back module to the connection M of the GBM-8
according to fig. 6.
Supervising switched off rail sections
Rail sections to be switched off during operation (e.g. in a shadow station)
can be supervised with the track busy indicator, as well. For that purpose
you have to mount a resistor of 1 kΩ into the lead-in wire of the rail
section concerned so that it bridges the switch when the rail section is
switched off (see fig. 4 connection to G2)
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