EUD-2016026-00 Rev.2, SmartScanIS User’s Guide for Union Pacific, 14 January 2021
25
STC transducers consist of a horseshoe magnet with a tightly wound coil, encapsulated in a
rigid epoxy potting compound. Each transducer is mounted 1-9/16 inches (3.97 centimeters)
below the top of the rail. As the wheels of a railcar pass over the transducer, the wheel flange
disturbs the flux field of the magnet, causing the output of a sinusoidal waveform of varying
amplitude. The depth of the flange and the speed at which the wheel is moving determines
amplitude.
The SmartScanIS can use two types of STC magnetic transducers. Both are identical, but are
named differently, depending on their location and their function. One type is called gating
transducer. The other is called advance transducer.
All tracks use two rail-mounted gating transducers. On the rail nearest the bungalow (aka
wayside enclosure), these transducers (labeled
TO1
and
TO2
) are mounted near and to the
north or east of the bearing scanner. They control scan timing and car recognition.
Additionally, some tracks use rail-mounted advance transducers. On the rail nearest the
bungalow, the two advance transducers (labeled
ADV1
and
ADV2
) are mounted about 32 feet
(9.75 meters) on either side of the gating transducers. The first one encountered provides a
signal that changes the state of an inactive system from idle to scan mode. (Instead of two
advance transducers, train presence can be ascertained by using a track circuit.) Once
mounted to the rail, the bodies of advance transducers and gating transducers can be moved
up and down.
The figure below shows a transducer cable.
One end of the transducer cable comes attached to the transducer. The other end has two
wires protruding from the conduit. These wires are black and white. They attach to a surge
protector located on the surge-protection panel. There is one surge protector assigned to
transducer TO1 and another to transducer TO2. These surge protectors protect the
SmartScanIS from transients and surges, which can be induced onto external wiring by
lightning.
Содержание SmartScanIS
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