Table of Contents
Advertisement
2.
APPLICATION, INSTALLATION, AND ADJUSTMENTS
2.1. General
This section provides information on the application of the ATT-20, as well as
installation and adjustment procedures for the ATT-20 and related equipment. It is also
critical that this section be read in its entirety prior to any application considerations.
2.2. Shunt Mode Track Circuit Application
In this application, the transmitter output and receiver input are connected by cable
directly to the rails. The connection is made through surge protectors by twisted line
pairs as shown in Figure 2-1. The point at which the transmitter wires are connected
one end of the track circuit. While the other end of the track circuit is
defines
the receiver connections to the track. The receiver detects the presence of a train by the
loss of the audio frequency signal that is shunted away by the train axle.
The shunt mode of operation is defined as a vital application.
USSP-21
1
3
2
4
TO
BATTERY
Figure 2-1. Shunt Mode Track Circuit Application
Copyright 2019
3
1
4
2
ATT-20
TWISTED PAIR
SM 6299 Rev. 3, March 2019
ATT-20 Audio Track Transceiver
300 FEET
MAX.
USSP-21
1
2
5
7
8
6
defined
RING-BY
HARD-WIRE SHUNT
3
USED DURING
4
SET-UP
by
2-1
Hide quick links:
Advertisement
Table of Contents
