Ray5 Flame Sensor and Motion Sensor Alarm Troubleshooting

The flame sensor and motion sensor are built-in safety features on the Ray5 laser engraver, designed to protect both the machine and the engraving process. In some cases, these sensors may trigger unexpectedly due to environmental conditions, incorrect settings, or hardware issues. This guide explains how to identify and resolve common alarm problems.

Flame Sensor Alarm

The flame sensor can be easily triggered. When it is activated, the LightBurn console will display Alarm 3. This can happen for several reasons, including ignition during use, strong light exposure, incorrect settings, short circuits, or even sensor damage.

To avoid unnecessary alarms, it is important to maintain a proper working environment. Avoid open flames during engraving. If an open flame occurs, reduce the laser power immediately to prevent triggering the sensor.

Environmental lighting also plays a role. The engraving machine should be placed in a normal indoor environment and kept away from strong light sources such as flashlights or direct sunlight, as these can interfere with the sensor.

If the flame sensor is still triggering, you can adjust its sensitivity. Open LightBurn or LaserGrbl, connect your machine via USB, and enter the following command in the control panel:

This command lowers the flame sensor trigger threshold. If the issue continues, you can further reduce the value until the sensor behaves normally.

In some cases, the issue may be caused by a hardware contact. If the flame sensor is triggered at the beginning of engraving, check whether the sensor’s metal pins are touching the metal casing. The flame sensor is a black cylindrical probe located at the back of the RAY5 control box. Carefully adjust its position to prevent contact.

If necessary, you can temporarily disable the flame sensor by entering:

To enable it again, use:

Motion Sensor Alarm

The motion sensor is designed to detect unexpected movement during operation. However, it may also trigger due to machine instability, incorrect settings, or sensor issues.

Make sure your engraving machine is placed on a stable and level surface. Any vibration or movement during operation can cause the motion sensor to activate.

If the sensor is too sensitive, you can adjust its trigger threshold through software. Open LightBurn or LaserGrbl, connect your machine via USB, and enter the following commands:

These commands reduce the sensitivity of the motion sensor and help prevent false alarms.

If the motion sensor continues to trigger at the start of engraving, it may indicate a hardware issue. In this case, you can disable the motion sensor by entering:

To turn it back on, simply send:

Conclusion

Flame sensor and motion sensor alarms on the Ray5 laser engraver are generally caused by environmental interference, configuration issues, or hardware-related factors. Most cases can be resolved by reviewing system settings, ensuring a stable operating environment, and checking basic hardware conditions.

If the issue persists after completing the troubleshooting steps, it is recommended to contact technical support at support@longer.net for further diagnosis and assistance. This helps ensure safe operation and long-term stability of the device.