Laser Power Supply Indicator Light Blinking

Quick Troubleshooting Guide for Fiber Laser Users

If your fiber laser power supply indicator light keeps blinking, don’t panic.
In most cases, this is a protective warning, not a serious laser failure.

This quick guide explains what it means and what to check, in plain language.

What Does a Blinking Indicator Light Mean?

A blinking red or alternating red-green light usually indicates that the laser power supply is not in normal working status.

Common reasons include:

• Power signal abnormality

• Cooling water issues

• Incorrect internal power settings

• Unstable input voltage

Most of the time, the laser source itself is not damaged.

Step 1: Safety Check (Do This First)

Before any inspection:

• Turn off the main laser power

• Shut off the cooling water

• Wait at least 10 minutes after power-off

• Make sure there is no residual voltage

This avoids electric shock and component damage.

Step 2: Check Cooling Water System

Cooling problems are a very common cause of alarms.

Make sure:

• All water pipes are fully inserted and locked

• No leaks or loose connections

• Water flows normally after restarting

After restoring water, wait a few minutes and observe the indicator light again.

Step 3: Check Power and Signal Connections

Next, inspect the wiring:

• Input power should be stable (usually AC 380V ±5%)

• Power cables must be firmly connected

• Control and signal wires should not be loose or reversed

Even a small connection issue can trigger warning lights.

Step 4: Power Supply Adjustment (If Required)

In some cases, the power supply needs a simple internal adjustment to return to normal operation.

This may include:

• Opening the power supply cover

• Removing protective silicone in a specific area

• Bridging designated solder points

This step should be handled by trained technicians only.

Step 5: Power-On and Functional Test

After everything is restored:

1. Turn on cooling water and check for leaks

2. Power on the system

3. Observe the indicator light

   • Alternating red and green usually means normal status

4. Run a low-power laser test (around 10%)

5. Let the machine run for 20–30 minutes to confirm stability

Final Summary

A blinking laser power supply indicator light is usually a warning, not a failure.
Most issues are related to cooling, wiring, or power settings, and can be resolved with basic checks.

If the alarm continues after inspection, professional technical support is recommended.