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Terminal Loops in Digital Operation
Every model railway enthusiast knows the problem of terminal loops from his / her conventional system. In
digital operation too, the left-hand rail profile meets the right-hand rail profile after a terminal loop and
would cause a short circuit without the appropriate wiring.
The ROCO 10767 terminal loop module solves the problems of a terminal loop in digital operation. Isolate
the terminal loop with both poles on both sides by disconnecting the terminal loop completely from the
rest of the system, using either insulated connectors or by sawing the rail profiles (see fig. 4 on page 5).
It is imperative that the isolated section of track within the terminal loop is longer than the longest train
which is going to travel through the terminal loop. The power supply to the terminal loop is connected to
the output of the terminal loop module which provides the power supply for the terminal loop. The module
itself is connected either to a track outside the terminal loop or directly to the Z21.
The terminal loop module functions as follows: A train enters the terminal loop – the direction is not
important – and the polarity of the tracks before and within the terminal loop is not identical. There is
then a short circuit within the module which the module immediately detects. The module then reverses
the polarity in the terminal loop before the short circuit detection function of the Z21 detects anything or
the train slows down. The terminal loop polarity is then corrected for the entry of the train. The reverse
of polarity in the terminal loop does of course render the polarity incorrect for the train’s exit from the
loop. This procedure or reversing the polarity is therefore repeated when the train exits. Since in digital
operation the polarity of the tracks do not determine the direction of travel of the train; the train can pass
through the terminal loop without stopping or without your intervention.
In order for the terminal module to detect incorrect polarity in time, you have to set its sensitivity using the
potentiometer visible on the side. See the terminal loop module’s instructions for use.
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