Four Sets of Lights Are Operated. LED Lights with a Common Negativeconnection Are Used

Instructionsforthe UK crossing4L

The crossing controller can work on single or double track. It may be operated by reed switches, IRDOT-1 infra red detectors or manually with a switch.

Four sets of lights are operated. LED lights with a common negativeconnection are used

Power connections

The power supply connects to terminal 0 and + as shown above. The crossing controller can work from 12 to 16 Volts either AC or DC.

For a 12 volt DC supply connect the supply positive to the "+" and supply negative to the "o" terminals of the crossing controller. The IRDOT-1s are wired to the same power supply as shown in the diagram. Connect the terminal 1s to positive and the terminal 6s to negative. If AC is used be very careful to ensure that all terminal 6's of the IRDOTs and terminal "0" are connected to one of the AC terminals and that all terminal 1's and terminal "+" connect to the other terminal of the AC supply. Mistakes in AC wiring can result in damage to the terminal 2 transistor of the IRDOT-1. To safeguard against damage a diode can be used in one of the feeds from the power supply.

Train detectors

For a single line crossing one detector is required at either side of the crossing. This is shown above. Wire from terminal 2 of one of the IRDOT-1s to terminal D1 of the crossing controller. Wire from terminal 2 of the other IRDOT-1 to terminal D2 For double track two more detectors or reed switches are wired to terminals D3 and D4.

Now check that each IRDOT-1 is working correctly. The LED supplied fitted to the IRDOT-1 should light when your hand moves over the IRDOTs infra red sensors. If the LED does not light recheck the power wiring. If the LED is permanently lit check for infra red reflections off sleepers etc.

Reed switches can be used instead of IRDOT-1 train detectors. Wire one end of each reed switch to the "o" terminal. Wire the other end of the reed switch as described for terminal 2 of the IRDOT-1.

Crossing lights

Terminals are provided for four sets of road traffic lights. Each set of lights consist of 2 red and 1 amber LEDs. Different sized LEDs may be substituted. The short leg of every LED connects to the COM terminal. The long leg of each LED to the appropriate terminal as shown in the diagram. Resistors for the LEDs are built into the board.

Manual switch

For manual operation a switch is wired to make a connection between terminal "o" and terminal "SW".

Heathcote Electronics, 1 Haydock Close, Cheadle, Staffordshire, England, ST10 1UE

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