tams elektronik B-4 User Manual page 11

Booster B-4
Short circuit warning
As a basis for a PC controlled booster management the B-4 can send a
short circuit warning when a limiting value underneath the set
interrupting current is exceeded. The PC control can switch off carriage
lighting in an overloaded booster section then, for example, when a
short circuit due to overload is imminent.
The limiting value for the short circuit warning can be set from a value
0 to 1.0 A below the set interrupting current. The short circuit warning
is sent as in form of a second pulse periodical switching on and off in
the short circuit feedback line.
Switching off at overtemperature
When overheating the booster switches off automatically for safety
reasons. Possible causes:

Hindrance to the flow of air through the ventilation slits at the
booster´s top and back surface.

Significantly higher rated voltage of the transformer than the set
track voltage in combination with a high current consumption.
Watchdog function
With this function the control unit (usually controlled by a PC software)
sends in intervalls of 5 seconds a DCC points switching command to an
address assigned to the B-4. As soon as the B-4 does not receive these
commands any longer, it switches off automatically.
After switching on the booster the watchdog function is initially inactive.
It will be activated by sending a switching command to the assigned
points address. This allows you to run the layout without a PC control
and without deactivating the watchdog function.
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Page 11