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GBM-1
Evaluation of the busy signals and connection of subordinate consumers
The evaluation of the track busy signals is done internally against ground. Thus, all consumers
whose inputs switch to ground can be connected to the outputs of the GBM-1 and triggered
depending on the occupancy status of the track sections.
Note: In principle, digital feedback modules that switch to ground (e.g. s88 feedback modules)
can also be connected to the outputs of the GBM-1. However, due to the high sensitivity of the
GBM-1, interference voltages from the digital system can cause false alarms.
The four outputs of the GBM-1 can be loaded with up to 500 mA. Many downstream circuits
can therefore also be connected directly and switched on or off depending on the occupancy
status of the track sections. Consumers that require a higher current must be switched via
relays.
Display of occupied messages
When a connected track section is occupied, the assigned LED on the track occupancy
indicator lights up. Additional lamps or LEDs (e.g. in a track diagram control panel) can be
connected to the four outputs assigned to the signal sections.
Note: If consumers are connected downstream that operate with a higher voltage than the
GBM, this can cause the LEDs on the module to light up dimly even though the connected
track sections are not occupied.
Operation overview| 7