A galvo alarm is one of the most common issues users may encounter when operating a handheld laser cleaning machine. Although the alarm may seem alarming at first, it is often caused by simple configuration, hardware, or operating issues that can be resolved quickly.
The key to efficient troubleshooting is to first determine when the alarm occurs. Does it appear only after you start cleaning, or does it appear immediately after the machine is powered on? Understanding this difference can save valuable troubleshooting time and help you get back to work faster.
In this guide, Rayno Laser explains the most common causes of galvo alarms and provides practical troubleshooting steps for operators and maintenance personnel.
Why Does a Galvo Alarm Occur?
The galvanometer (galvo) scanner is one of the core components of a laser cleaning machine. It controls the movement of the laser beam and ensures accurate scanning patterns during cleaning.
When the control system detects an abnormal condition affecting the galvo, it triggers an alarm to protect both the machine and its components.
Fortunately, many galvo alarms are not caused by component failure. They are often related to machine settings, startup procedures, or external connections. The possible reasons as below:
| Symptom | Possible Cause | Recommended Solution |
|---|---|---|
| Galvo alarm after cleaning starts | Lens cover not removed | Remove the protective cover |
| Galvo alarm after cleaning starts | Laser not enabled | Enable the laser source |
| Galvo alarm after cleaning starts | Emergency stop activated | Release the E-stop |
| Galvo alarm after cleaning starts | Incorrect parameters | Reset parameters |
| Galvo alarm at startup | Incorrect 15V wiring | Check the wiring |
| Galvo alarm at startup | Power supply failure | Replace the 15V power supply |
| Galvo alarm at startup | Damaged mirror | Replace the reflector |
| Galvo alarm at startup | Faulty galvo motor | Replace the motor |
Scenario 1: The Alarm Appears Only After Starting Laser Cleaning
If the machine powers on normally and the galvo alarm only appears after you begin cleaning, start by checking the following items.
1. Is the Protective Lens Cover Still Installed?
Before operating the laser cleaning machine, confirm that the protective lens cover has been removed.
If the protective cover remains in place, the laser cannot operate correctly, which may trigger a galvo alarm.
Solution:
- Remove the protective lens cover.
- Restart the cleaning process.
2. Has the Laser Been Enabled?
Some users forget to enable the laser source after powering on the machine.
Without laser output, the control system may report abnormal operating conditions.
Solution:
- Verify that the laser source is enabled.
- Confirm the machine has entered normal operating mode.
3. Check the Emergency Stop Switch
Many handheld laser cleaning heads are equipped with an emergency stop (E-Stop) button.
If the emergency stop remains engaged, the system will prevent normal operation.
Solution:
- Release the emergency stop.
- Restart the machine if necessary.
4. Verify Cleaning Parameters
Incorrect parameter settings can also trigger alarms.
Examples include:
- Laser power exceeding the machine’s maximum limit
- Parameter values below the allowable range
- Incorrect scanning settings
Solution:
- Review all cleaning parameters.
- Restore recommended settings if necessary.
- Confirm the selected cleaning mode matches the application.
Scenario 2: The Alarm Appears Immediately After Power-On
If the galvo alarm appears immediately after the machine is switched on, the issue is more likely related to hardware or electrical components.
The following checks should be performed.
1. Check the 15V Power Supply Wiring
One of the most common causes is incorrect wiring between the controller board and the 15V switching power supply.
Loose motor cables can also generate a galvo alarm.
Solution:
- Verify that the controller board’s +15V, -15V, and GND terminals are connected correctly to the switching power supply.
- Ensure the galvanometer motor cable is fully inserted and securely fastened.
2. Inspect the 15V Switching Power Supply
A damaged switching power supply will prevent the galvo from receiving the required operating voltage.
Typical symptoms include:
- Power indicator not illuminated
- No 15V output when measured with a multimeter
Solution:
- Measure the voltage using a multimeter.
- Replace the 15V switching power supply if no output voltage is present.
3. Inspect the Reflective Mirror
After long periods of operation, the reflective mirror inside the laser cleaning head may become damaged.
Possible problems include:
- Burn marks
- Heat accumulation
- Detached mirror
These conditions may trigger a galvo protection alarm.
Solution:
Replace the damaged reflective mirror with a new one.
Regular inspection of optical components is recommended to maintain stable cleaning performance.
4. Check the Galvo Motor
If the galvo motor becomes unusually hot or produces abnormal noise during startup, it may indicate internal failure.
Common symptoms include:
- Excessive heat
- Unusual vibration
- Abnormal mechanical noise
Solution:
Replace the galvo motor if these symptoms are observed.
A Simple Troubleshooting Workflow
When a galvo alarm occurs, avoid replacing parts immediately. Instead, follow this order:
- Identify when the alarm appears.
- Check operating conditions and machine settings.
- Inspect the emergency stop and laser enable status.
- Verify all parameter settings.
- Check wiring and power supply.
- Inspect optical components.
- Evaluate the condition of the galvo motor.
This step-by-step approach can quickly eliminate the most common causes while reducing unnecessary downtime.
Preventive Maintenance Tips
To reduce the likelihood of galvo alarms, Rayno Laser recommends:
- Regularly inspecting cable connections.
- Keeping optical components clean.
- Checking the condition of reflective mirrors.
- Avoiding parameter settings outside the recommended range.
- Performing routine maintenance on cooling and electrical systems.
- Following the correct startup and shutdown procedures.
Preventive maintenance not only minimizes unexpected alarms but also extends the service life of your laser cleaning machine.
FAQ
Why does my laser cleaning machine show a galvo alarm?
A galvo alarm usually indicates an issue with the scanning system, power supply, optical components, wiring, or operating parameters. The first step is to determine whether the alarm appears during startup or after laser cleaning begins.
Can incorrect parameters cause a galvo alarm?
Yes. Parameter settings outside the allowable range may trigger a galvo alarm. Always verify laser power, scanning speed, and cleaning mode before operation.
Can I continue using the machine after a galvo alarm?
No. The machine should be inspected before continuing operation. Ignoring the alarm may result in damage to the galvo scanner or optical components.
Does a galvo alarm always mean the scanner is damaged?
No. In many cases, the issue is caused by wiring, power supply, emergency stop activation, or incorrect operating settings rather than a failed galvo motor.
Need Technical Support?
Rayno Laser provides professional technical support for all our handheld laser cleaning machines, including pulse laser cleaning machines and continuous laser cleaning machines.
If your machine displays a galvo alarm that cannot be resolved using the above steps, our technical team is ready to assist with remote diagnosis and troubleshooting.
Contact Rayno Laser today for expert support, maintenance guidance, and high-performance laser cleaning solutions.
