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14 January 2021, SmartScanIS User’s Guide for Union Pacific, EUD-2016026-00 Rev.2
6.4 Track Circuit
Not all sites use a track circuit. If your site doesn't use one, skip the instructions below and go
to
6.5 AEI Antennas
.
Following the directions that came with your track circuit:
1
Mount both track-wire connectors.
Mount one connector on each rail, directly opposite each other. Mount them within 5 ft
(1.5 meters) of the scanners.
Connection to the rail can be made in one of two ways:
Bonding
– Cadweld manufactures a complete line of bond welding systems that
are commonly used in the rail industry. The recommended practice is to weld a short
length of bond strand to the web of each rail. Cadweld can provide these items as
pre-packaged kits, which include the bond strand (
a 3/16”- diameter strand is
recommended
), and the one-shot welding system.
Note: A reusable mold of the
correct size, to be acquired by the distributor of your choice, is required.
Drilling
– The alternative to “Cadwelding” is to drill a 3/8” hole in the web of each
rail at the neutral axis, and apply a bonding kit. The kit includes ready-made lengths
of bond strand with "chicken heads" attached. The "chicken heads” are tapered solid
metal inserts that can be driven into the 3/8” holes to establish a permanent
connection to the rail.
2
Attach wires to the track-wire connectors.
Wires should be as short as practical. They should be 9 AWG (or larger) insulated
copper wire. Total wire resistance shouldn't exceed 0.2 ohm.
3
If this is a single-track site, label the end of the wires that aren't attached to the
track-wire connectors
TC
.
4
If this is a double-track site, label the end of the wires that aren't attached to the
track-wire connectors
TC-TRACK1
or
TC-TRACK2
, whichever is appropriate.
5
Extend the wires into the bungalow and leave them coiled on the floor.
6
If this is a single-track site, go to
6.5 AEI Antennas
.
7
If this is a double-track site:
a
Repeat steps
1
through
5
on the second track.
b
Go to
6.5 AEI Antennas
.
6.5 AEI Antennas
Not all sites use AEI antennas. If your site doesn't use them, skip the instructions below and
go to the next chapter.
At each SmartScanIS site that uses AEI, two 100-watt Sinclair SRL470 antennas or two
100-watt Scala HP9-915 Parapanel antennas are installed per track. In reference to the track,
antenna1
is the northmost or eastmost antenna.
Antenna2
is the southmost or westmost
antenna. (As a means of reference, transducer
TO1
is the first gating transducer going north
or east from the bearing scanner. It is the gating transducer closest to the bearing scanner.)
Summary of Contents for SmartScanIS
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