One track, two-way rail traffic When Sensor 1 detects a train, the controller will activate the signals. The train has up to 30 seconds to reach Sensor 3. As long as the train is on either Sensor 3 or Sensor 4, the signals will flash. When the end of the train clears Sensor 3 and Sensor 4, the controller will turn off the signals.   Similar operation happens for trains moving from right to left.	The following module is required for this installation:   • One MRX2 controller with four sensors

Two tracks, two-way rail traffic For this double-track crossing, trains travel in either direction on each track. As in the example above, 'standard resolution' is used (four sensors per track).   Sensor E and Sensor W are two single train detectors, which connect to the MRX2 controller.   Install the '8det 2trk' jumper on the MRX2 circuit board to enable 'eight detector, two tracks' operation.	The following modules are required for this installation:   • One MRX2 controller with six sensors, and • Two MRD1 single detectors

 

One track, two-way traffic, with stops near the crossing Trains travel in both directions. Trains might stop at the station or water tank.   If trains might stop or change direction within the crossing detection zone, one or two additional sensors help to maintain prototypical crossing signal operation. We call this 'high resolution' because the extra sensors give the controller a more accurate picture of where the trains are and which direction they're moving.   The controller will activate the signals when Sensor 1 detects a train approaching from the left. If the train stops at the station before it reaches Sensor 2, then the signals will turn off after 30 seconds, even if part of the train is still on Sensor 1.   When the train begins moving to the left again, the signals will re-activate when the train reaches Sensor 2. The train has another 30 seconds to reach Sensor 3 to keep the signals activated.   The signals remain active as long as the train is on Sensor 3 or Sensor 4. Once the train clears both Sensor 3 and Sensor 4 the signals will turn off.

Similar operation happens for trains moving right to left, which may or may not stop at the water tank.     The following module is required for this installation:   • One MRX2 controller with six sensors

One track, road crossings near each other Each set of crossing signals needs its own controller. The two controllers can share sensors when the detection zones overlap. In this example, Sensor B and Sensor E are connected to both MRX2 signal controllers. Each controller is operating in 'standard resolution' mode, (four sensors per crossing).   Sensor A gives early warning of eastbound trains approaching the 1st Street crossing. Sensor B gives early warning of eastbound trains to 2nd Street crossing, and it also tells the 1st Street crossing when the train has entered the 1st Street crossing.   When one sensor connects to two or more controllers, make sure the C 'common' terminal on all controllers are connected together.

The following modules are required for this installation:   • One MRX2 controller with six sensors, and • One MRX2 controller with no sensors

Multi-track crossings For crossings with multiple tracks, beyond the two-track examples shown above, use one MRX2 controller for the first one or two tracks, then add one or more MRD6 HexDetex™ expander units for the remaining tracks.   The MRD6 HexDetex™ expander is available with four or six infrared train sensors, and is configured in the same way as the MRX2 controller.

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