EUD-2016026-00 Rev.2, SmartScanIS User’s Guide for Union Pacific, 14 January 2021
339
A.9 Cold Wheel Scanner Resistor Alarm
The Cold Wheel Scanner Resistor alarm represents the wheel scanner's equivalent of the
bearing scanner's Cold Resistor alarm. Evaluation of Cold Wheel Scanner Resistor alarm
occurs in two stages. The first stage mimics the same logic used in the evaluation of Cold
Resistor alarms. After finishing this check, and possibly flagging a Cold Wheel Scanner
Resistor alarm, the firmware compares the recorded resistor temperature against a value of
one-third the hot wheel alarm limit. If the recorded resistor temperature meets or exceeds this
value, the firmware cancels any previously flagged Cold Wheel Scanner Resistor alarm. In
this way, the system confirms the scanner's ability to read alarm level heat. Just like Cold
Resistor alarms, separate Cold Wheel Scanner Resistor alarms exist for each railside.
The
maximum number
(per railside) of consecutive trains, having Cold Wheel Scanner
Resistor alarms, allowed before generating a Successive Cold Wheel Resistors Exceeded
alarm is set by the
Cold Trains option
on the Alarm Limits submenu. Successive Cold Wheel
Resistors Exceeded alarms are covered in the next appendix.
Milepost-0081.2, Track:Single
Alarm Limits
---------------------------------------------------
•
•
•
H) Cold Wheel Scanner.........
30°
I) Cold Trains.................
3
J) Sliding Wheel Ratio......... 50%
•
•
•
A.10 Dead Wheel Scanner Resistor Alarm
The Dead Wheel Scanner Resistor alarm indicates the presence of two separate conditions.
First, the train must contain a Cold Wheel Scanner alarm on a given rail. Second, the
recorded temperature for the resistor on that rail must fall below the value set by the
Cold
Journal option
on the Alarm Limits submenu.
Chapter 11 - Serial Interface
tells how to view
or change the
Cold Journal option
.
There is a different Dead Wheel Scanner Resistor alarm for each rail. That is, there is a Dead
North Wheel Scanner Resistor alarm and a Dead South Wheel Scanner Resistor alarm (or,
depending on track direction, a Dead East Wheel Scanner Resistor alarm and a Dead West
Wheel Scanner Resistor alarm).
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