This unit has a built in relay to provide single pole change-over relay contacts as well as the "train detected" LED for wiring to the control panel. The diagram shows that with no train detected the relay connects terminal 2 and 4. When detecting a train, the relay connects terminals 3 and 4. These contacts are electrically separate from the IRDOTs power and form a train-operated switch. The relay contacts can handle up to 2 amps of current.
AUTOMATIC STOP:
The IRDOT-2 can give precise stopping of trains in hidden sidings. When the front of the train is detected the relay breaks the electrical connection to the track. A push button switch ("on" when pressed) reconnects the power. The advantage of this compared to using a dead section is that the train stops when its front is detected by the IRDOT-2 and an LED is lit on the control panel to show the trains presence. The isolation section can be any length. The number of wheel pickups or whether the engine is at the front or rear of the train does not affect the stopping position. Wiring the IRDOT-2's LED to the control panel will show which loops and sidings have trains in them.
ALTERNATIVE TO REED SWITCHES AND MAGNETS:
The IRDOT-2 relay can replace reed switches. It will operate other manufacturers electronic modules intended for reed switch operation.
COMPUTER INTERFACE:
As the relay contacts are electrically isolated, it is safe to use them with computer interfaces. This allows a computer to "know" which tracks are
empty and when a train has arrived.
SWITCHING SLOW MOTION POINT MOTORS:
As slow motion point motors require a low current applied for a long time they can be operated by the IRDOT-2. For
very short trains, light engines etc. it may be necessary to stop over the IRDOT-2 to give
sufficient time for the point to switch.
DIMENSIONS:
Board area 97mm x 30mm 3.8 inches x1..2inches
The infrared devices extend 22mm (0.9 inches) above the board and
are 3 mm plus sleeving in diameter
02/23/02
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