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14 January 2021, SmartScanIS User’s Guide for Union Pacific, EUD-2016026-00 Rev.2
10.11 Sliding Wheel Alarms
The Sliding Wheel alarm indicates that a combination of very low bearing and wheel
temperatures were found on a given axle in conjunction with high wheel temperatures
recorded on the remaining axles of a car. This condition could mean that the wheels on the
affected axle were sliding, rather than rolling, on the rail.
The Sliding Wheel alarm is both an Exception Alarm and a System Alarm. Sliding Wheel
alarm detection is enabled/disabled using the
Sliding Wheel option
on the Equipment
submenu. The Sliding Wheel function requires that both bearing and wheel scanners be
installed and in operation at a site. The Sliding Wheel detection algorithm is intended to be
used where trains travel down a long grade before reaching the site. The algorithm calculates
average wheel and bearing heat per train side and per car and attempts to isolate those axles
that have extremely low bearing and wheel temperatures in comparison.
The
Sliding Wheel Ratio option
on the Alarm Limits submenu is used to specify the ratio that
is applied when evaluating wheel and bearing temperatures to identify sliding wheels. This
ratio is applied to calculated average temperatures to establish minimum acceptable wheel
and bearing temperatures that are in turn used to identify sliding wheels.
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