Azatrax
facebook

 
Home
 
Train Detectors
 
Relays
 
USB
 
Signal Controllers
 
Crossing Signals
 
Block Signals
 
Reversing Tracks
 
Switch Control
 
Tortoise Motors
 
Exhibit Controller
 
Bell / Strobe
 
Power Supply
 
About Us
 
Contact
 
Links
     

How to configure a crossing signal system for your model railway

To help you choose the right number of train detectors and crossing signal controllers, find the configuration that best represents your grade crossing on your layout.
 
 • Trains travel in one direction on each track
 
 • Trains travel in both directions on each track
 • Both directions with station stop near the crossing
 
 • One track with three block occupancy detectors
 
one-way rail traffic
One-way rail traffic
Trains travel in one direction only on each track, and normally do not make stops near the crossing.
 
This is called Low Resolution detection because only two train sensors are used on each track. The MRX3 controller is able to watch one or two tracks in low resolution mode.
 
How it works: When a train travels from left to right on Track 1, it is detected by sensor #1. The MRX3 will activate the crossing signals for up to 30 seconds. Once the train reaches sensor #5, the signals stay on until the train leaves sensor #5.
Similar operation occurs on Track 2 when a train moves from right to left.
The following module is required for this installation:
 
• One MRX3 controller with four sensors

 

 One track, trains travel in both directions:

one track, bi-directional
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 MRX3 controller with four sensors

double track RR crossing
This diagram shows sensor locations for the MRX3 control circuit.
If using an MRX2 controller, swap the locations of sensor #4 and sensor #6.
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 MRX3 controller.
The following modules are required for this installation:
 
• One MRX3 controller with six sensors, and
• Two MRD1-NV single detectors
 

siding switch near crossing
This diagram shows sensor locations for the MRX3 control circuit.
If using an MRX2 controller, swap the locations of sensor #4 and sensor #6.

detector connection Two tracks, two-way rail traffic with switch
For this double-track crossing, trains travel in either direction on each track. There is a switch near the crossing where the two tracks merge.
As in the example above, 'standard resolution' is used (four sensors per track).
 
Sensor E is a single train detector, such as an Azatrax MRD1-NV detector.

The following modules are required for this installation:
 
• One MRX3 controller with six sensors, and
• One MRD1-NV single detector
 
The track turnout also needs to have an electrical switch contact linked to the turnout points.

 
one track with stops
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 MRX3 controller with six sensors

Multi-track crossings
For crossings with multiple tracks, beyond the two-track examples shown above, use one MRX3 controller for the first one or two tracks, then add one or more MRD6X HexDetex™ expander units for the remaining tracks.
 
The MRD6X HexDetex™ expander is available with four or six infrared train sensors. Sensor configuration is similar to the MRX3 controller.
many tracks
[Back to the top]


Paypal verified   facebook Home | Detectors | Signal Flashers | Bell Ringer | Relays
Crossing Signals | Power Adapter | How to order | Contact us | Links
© copyright 2009-2017 Azatrax LLC, Longmont, Colorado