RailNET In a NEMA Enclosure Installation Manual

RailNET In a NEMA Enclosure allows for easy installation by using mindful packing techniques.

Site Considerations

Pre-construction

1. Find the transducer location first. This is the center of the site. The center of the transducer must be located between two ties. This allows the cable at the bottom of the transducer to enter the Carflex conduit without binding.
2. Find the tower locations. Since the center of the antennas and the center of the transducer must line up, the towers will be offset from the transducer. (The antennas mount to the side of the tower.)

Areas to Avoid

Comet Electronics recommends that the following site areas are avoided. Use this list as a guide only. Since all installations are unique in some manner, avoiding these areas is not always possible. A survey of each site should be done to determine preferred equipment locations, conduit runs, and antenna configuration based upon the particular application. The user and the system integrator must ensure correct and accurate system operation in the event the areas described below cannot be avoided.

• Large metallic objects and obstructions in close proximity to the reading area
• Areas where reverse train movements occur
• Areas where train switching moves occur
• Areas where “building” moves occur (dropping and adding cars)
• Areas where train stoppage in front of reader systems is likely to occur
• Areas with severe or multiple curves in the track
• Switches
• Track joints

Foundation

Install house foundation legs at top of tie level. All trenching is to be 36" below top of tie. Set tower foundations. Recommended: 200lbs of Sakrete for the nearside.

Conduit

Install all conduits in the same trench. Lay conduit out, make the necessary cuts, glue cut pieces together as necessary, and bury the conduit.

Conduit runs on drawings are guidelines. They may be changed to fit site specific requirements. Use sweeps, not elbows!

Towers

Install tower sections and tower caps. There are holes present at the bottom of the tower. Use these holes to guide drilling through the foundation, and secure tower to foundation using provided bolts. Secure towers with six bolts each, for twelve total bolts.

Ground Rods

Install ground rods and cabling. (Pigtail at corner ground rods into hut.)

Antennas

Place the center of the antenna 3 feet 6 inches above the top of the rail and 11 feet 6 inches away from the center of the rail. The tower face should be 12 feet from the center of the rail.

Place the second antenna directly across from the first.

1. Refer to Appendix C: Site Drawings for detailed installation drawings.

Wiring Power to the AEI Box

Power must be wired into the AEI box by a licensed electrician.

Wheel Sensor

Refer to Frauscher Wheel Detector Installation and Optimization for instruction on installing the wheel sensor.

Presence Subsystem

Install loop cable on track. Loop cable must be twisted 5 times per foot from track to pedestal (if used) or junction box. Install twisted loop cable in Carflex conduit.