Safety Devices; Short-Circuit Switch-Off - tams elektronik B-6 Manual

Booster B-6

2.5. Safety devices

2.5.1. Short-circuit switch-off

The B-6 has an internal short-circuit cut-off which automatically sets the booster to "STOP"
(i.e. switches off the track voltage at the output) in the event of a short-circuit at the track
output. This prevents defects on the booster, the track and the vehicles. The time until the
short-circuit switch-off responds (= short-circuit sensitivity) can be set to a value between 20
and 200 milliseconds.
The cut-off current in case of a short circuit (= maximum track current) can be set to a value
between 2 and 6 A (in 1 A steps). In order to effectively prevent damage in the event of a
short circuit, the cut-off current must not be set too high, especially for smaller nominal sizes.
→ Section 5 "Recommendations for the settings".
Short-circuit feedback
How the digital control reacts when the maximum current at the track output of the booster is
exceeded (e.g. a short circuit) depends on the connection of the booster:

Connection of the short-circuit feedback line ("CDE") to a digital central unit via the DCC-
compliant booster interface: The booster reports the exceeding of the maximum current to
the control unit, which switches the complete layout to "STOP". This solution is useful for
automated driving, for example.

Connection to the track output of a central unit or omitting the connection of the short-
circuit feedback line: If the maximum current is exceeded, the booster automatically
switches off the track voltage for the connected booster circuit. Operation continues in
further booster circuits. This solution is suitable for areas with independent operation, e.g.
in the depot.

Connection to a BiDiB PC interface (separate or integrated in the digital control unit): Based
on the status messages and operating values sent by the B-6 via the BiDi bus, the PC
control takes over the complete booster management.

Connection to a digital central unit via the BiDiB interface without integration in a BiDiB
control: The digital central unit can react on receipt of a short-circuit message via the BiDi
bus, provided it supports this function and is configured accordingly. → Manual of the
digital central unit.
Automatic restart after a short circuit
If the digital control unit cannot receive a short-circuit feedback or is configured to ignore this
message, the Booster B-6 automatically switches the track signal at the output back on ("GO")
after 4 to 10 seconds have elapsed following a short-circuit. If the short circuit is still present,
it switches the track signal off again immediately.
In the delivery state, the automatic switch-on is interrupted for one minute after the booster
has switched itself on and off again five times. This restart time after 5 short circuits can be
individually adjusted to a value between 0 and 90 seconds.
12 | Your B-6
tams elektronik