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Installation
3.3.
COMPATIBILITY WITH OTHER TRACK EQUIPMENT
Under some conditions, other types of signal equipment may share the rails with
Genrakode. This group of equipment includes overlay track circuits, motion sensors,
and constant warning time systems. Although the specific characteristics of each type
and brand of equipment varies, the following general statements can be made:
•
Any interference that may occur between Genrakode and other equipment most
likely effects the other equipment and not Genrakode. This is due to the relative
signal levels applied to the rails; Genrakode signals are high (1 - 2 Amperes)
whereas signals from other equipment are low.
•
The distance between the rail connections of Genrakode and the rail connections of
other equipment has a large impact on the ability for the equipment to co-exist. The
further apart the two connections, the lower the level of interference.
•
The lower the Genrakode transmit level, the lower the level of interference. The
higher the operating frequency of the other equipment, the lower the level of
interference.
3.3.1.
Overlay Equipment
Audio frequency overlay equipment is typically not a problem for either Genrakode or
the AF equipment. Genrakode operates without interference with signal amplitude up to
25 V RMS and frequencies between 1 kHz and 20 kHz. See Table C–11 in Appendix C
for frequency versus track input impedance data for AF equipment.
3.3.2.
Motion Sensors and Constant Warning Time Equipment
Motion sensors and constant warning time equipment (GCP, HXP) determine motion
and speed by measuring small changes in applied signals over relatively long periods of
time. This process makes the equipment susceptible to any changes of impedance that
may appear across the rails. During the transmission and reception of codes, the
Genrakode input impedance may experience small changes. Depending on a number of
variables, the changes may be sufficient to disturb the MS/CWT equipment. Although it
is impractical to attempt to address all possible applications, the following guidelines
reduce the potential for interference:
•
Where practical, maximize the rail distance between Genrakode and MS/CWT
equipment
•
Use the highest MS/CWT frequency possible to achieve the desired operation
•
When Genrakode and MS/CWT equipment reside at the same location, use
separate track leads to connect each to the rails
•
Use the lowest possible Genrakode transmit setting that produces reliable track
circuit operation
P2160B, Vol.1, Rev. Jan/07
3–3
Alstom Signaling Inc