Acting on Device Data

Understanding and responding appropriately to device data is essential for maintaining vehicle safety and device reliability. The TraX system continuously monitors wheel ends and device components, reporting sensor states that range from normal operation to critical faults.

This section provides practical guidance on how to interpret device data and prioritize actions, including:

• How alarm states are classified, what each priority level represents, and the recommended response
• When and how to reset or replace a device
• Required vehicle inspections following a Wheel End Failure alert

Priority levels and recommended actions

Device data is classified into five priority levels to indicate the urgency of response. Each level corresponds to specific sensor conditions and is represented by a color code.

Priority	Criteria	Color code	Action
No (5)	Normal operating status. No issues detected.	🟩 Green	No action required.
Low  (4)	The Wheel End feature reports No Data (typically for newly installed devices or insufficient data history).	⬜ Grey	Inform the user. Monitor until data becomes available.
Medium (3)	The Battery Level feature reports a Low Battery status.	🟧 Orange	Service will be required soon. Schedule maintenance promptly.
High (2)	A Wheel End Failure is detected, or the Wheel End Monitoring or Temperature Sensor reports a fault.	🟥 Red	Complete the current route, then have the issue inspected and resolved at a service facility before the next journey.
Critical (1)	A Temperature Warning is triggered. This warning is not generated by the device itself, but relies on implementation by the TSP.	🟥 Red	Do not continue the route. Address the issue immediately before proceeding.

For detailed information about individual device features, refer to the Device Features and Operational Indicators article.

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Determining when to reset or replace a device

As a general rule, statuses related to vehicle health—such as Wheel End Failure—can be reset. In contrast, statuses that indicate device operational issues cannot be reset and typically require device replacement.

An exception is the Wheel End Monitoring status when set to Reversed Position. This does not indicate a hardware failure, but rather incorrect installation, and can be resolved by reinstalling the device in the correct orientation.

Table: Alarm states, device behaviour & reset or replacement options

Column descriptions:

• Duration – Some states are automatically reset after a set period, others (marked with an asterisk *), are persistently included in the data frame.
• LED Indicators – Indicate whether the device’s LEDs are used to signal the current state; these LEDs are only active when the vehicle is stationary. For more information, see sections 4.12 LED Blinking and 4.8 Changing Mode Description in the TraX Technical Specification.
• Reset by App – Shows whether a state can be cleared using the TraX mobile application
• Replace Device – Specifies if the hardware must be replaced.

Alarm State	Duration	LED Indicators	Reset via App	Replace Device
Wheel End Failure	14 days	✅	✅
WEM¹: WEM Failure	14 days	✅		✅
WEM¹: Piezo Failure	*			✅
Temperature Sensor Failure	*			✅
Battery Level Low, or, Extreme Low	*			✅

Additional notes:

• ¹ WEM – refers to Wheel End Monitoring.
• ^* Asterix – efers to statuses persistently included in the data frame.

Other common symptoms of device failure

In addition to the table above, common symptoms of sensor failure include (but are not limited to):

• No data transmission from the device.
• LED does not illuminate when triggered by the magnet.
• Damaged or broken metal baseplate.

Reset options in the TraX Mobile App

The TraX mobile app provides two types of reset options, each serving a different purpose.

Option: Resetting an alarm

• The Reset Sensor feature in the TraX mobile app clears all active alarms and deletes all stored temperature data, without affecting the device’s configuration. 
• However, not all alarms are eligible for this type of reset (as detailed in a later section). The reset procedure is detailed in the SKF TraX User Manual, section 6.12 Resetting the sensor.

Option: Removing and recommissioning a device

• Alternatively, you can use the Remove Sensor option in the TraX mobile app. This disconnects the device from the SKF platform but does not alter its current operational state.
• To fully reset the device and restore its default configuration, you must recommission it. However, this reset is only temporary—once the process is complete, a new configuration will be applied shortly thereafter. As such, it is not possible to perform a factory reset and leave the device in an unconfigured state.

Replacing a device

Follow the steps below to replace a device:

1. Order a replacement device.
2. Remove the failed device from the vehicle.
3. Refer to Section 4 in the User Manual for mounting instructions.
4. Refer to Section 6.13 in the User Manual for activation instructions.

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Inspecting a vehicle after a Wheel End Failure alarm

When a Wheel End Failure alarm is triggered, follow the steps below:

1. Inspect the entire wheel end. The alarm may be caused by issues other than a bearing failure, such as:
   • A damaged or deformed tire
   • A tire hernia or flat spot from heavy braking
   • Rim damage or a detached rim
2. Remove the device if necessary to access and inspect underlying components.
3. Identify and replace the faulty part, whether it's the bearing or another damaged component.
4. Reinstall the device after completing all repairs.
5. Reset the sensor using the TraX Mobile App (see Section 6.12 for detailed instructions).
6. Return any damaged bearings to SKF, if possible, for further analysis.