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gwydir valley models...incorporating Stony Canyon Scenics and Trainmaster Hobbies

IRDOT-1 & -1D

The IRDOT-1 is the most basic train detection unit. This lights a (control panel) LED. It has an electronic "train detected" switch to activate our other units, a second green "not detected" LED, or a relay. It is also possible to operate a bicolour LED to give for example green "not occupied", red "occupied". The switch may also operate a relayor opto-isolator for interfacing to a computer etc.

The IRDOT-1d is identical to the IRDOT-1 in that it detects the train immediately, however it takes 4 seconds to undetect, this is to provide continuous detection of the train. As a train crosses the IRDOT-1 the LED will flicker off at each gap between wagons or coaches , the IRDOT-1D's LED will remain lit during these gaps due to the 4 second delay.

Main Uses:

  • Train detection in hidden sidings. The unit is supplied with a 5mm diameter red LED which lights when a vehicle is above it.
  • Train detection in conjunction with our SA range of shuttles, passing loops, station stops, block sections etc. The advantages over reed switches are that no magnets need to be fitted to the engine and the detector can be positioned where the front of the train is meant to stop rather than where the train mounted magnet will finish.
  • Train detection for uncouplers. When uncoupling at a distance from the controller it is difficult to judge when the couplings are aligned over the uncoupling magnet. The gaps between the vehicles can be detected by positioning the IRDOT-1 between the sleepers on the outside of the rails, these sleepers being adjacent to the magnet fitted within the rails.
IRDOT-1

When the IRDOT-1 detects a train, it lights an LED and operates an electronic switch "transistor". The IRDOTs are supplied with a 5mm red LED screwed to the correct terminals.After installation, the LED can be wired to a control panel.

IRDOT-1

The diagram above shows the arrangement of the screw terminals for the IRDOT-1.

Hidden Sidings and Loops

As the IRDOT can operate in tunnels and detect all types of rolling stock, it is very suitable for train positioning and indicating track occupation in hidden sidings and loops.It is usually best to position the IRDOT at the end of the loop where the front of the train is to stop.Once the "train detected" LED lights, the train can be stopped.

Green "not occupied" LED

The electronic switch of the IRDOT-1 will light an additional green "not occupied" LED.A 1K ohm resistor "shown by the brown rectangle" is used to limit the current through the green LED.


IRDOT-1

A bi-colour LED could be used instead of the two separate LEDs.The bi-colour LED will change colour from green "unoccupied" to red "occupied".Our bi-colour LED has three legs. The shortest connects to terminal 6.The other two legs connect as shown for the long legs of the two LEDs in the diagram.

Trigger for other modules

The IRDOT is used to activate other units when it detects a train.Terminal 2 will trigger the Dual Timer, IRDASCs, latching relay board, alternate route selector and SA units.

Operating Relays

The electronic switch output of the IRDOT-1 will operate many types of relay.A relay of any voltage can be switched subject to a maximum coil current of 100mA.If the relay coil voltage is 12 volts, it can use the same supply as the IRDOT-1.It will also operate an opto-isolator for interfacing to a computer.

Specifications

Voltage 12 to 16 volts, AC or DC
Maximum current consumption 25 m A

SIZE
Inches Millimetres
Length x Width 3.45 x 1.2 88 x 30
Height ( Board to highest component) 0.7 17
Height of infrared components 0.9 22