Laser Continuously Fires

So like title states my, 100W blue and white CO2 laser, continuously fires when moving. I have a strong assumption it may be my voltage converter but just in case it’s not, I’m posting here.

A few months ago the voltage converter that came with the unit stopped working, and nothing on the machine would power on, so I replaced it with one I found on Amazon that some others have used to replace their voltage converter that had gone bad; it’s a ELC T-3000 (picture added). Now the machine powers on and overall seems to work as it should, except after the laser head goes to the back right corner, to recalibrate itself, and moves back to its last starting position the laser begins to fire the entire time. I ran a couple test pieces and the laser continues to fire the entire time it’s moving.

I did read another post that had a similar issue but unlike theirs mine doesn’t fire when manually positioning the laser head, only when it’s moving under its own power either when running a file or moving into position.

So I’m not sure what to do at the moment. I don’t really know how to test my voltage converter other than put a multimeter to it, which I did and it reads 240V for the output.

I attached pictures of the files I was running and their results.

One final note. I doubt it would make a difference, but while the machine was down I switched back to using my Jtech laser (which ran fine). Not sure if switching back and forth threw something off or not. Again, I doubt it did but figured I would rule it out.




I’m trying to follow you. Is the PSU you are talking about the high voltage for your tube? There is more than one in the machine.

I’ll wait for some clarity, but the lps (laser power supply) is controlled by two signals. The ‘enable’ signal, which is usually tagged ‘L’ on the chinese supplies (blue wire in photo.) And the PWM signal (yellow). It requires L to be low and fires when the PWM signal goes high. It isn’t always labeled that way…

This is my supply

The ‘L’ is the enable and the ‘IN’ is the pwm input. You should be able to measure the IN voltage and it should vary with the % power. 50% power is about 2.5 volts the average for a 5 v input. If it’s low and firing the lps is probably bad.

The PWM signal is also available at the controller, which might be easier to get to, at CN5, LPWM1 for tube one.

The device you showed is a voltage converter, not a PSU.? Assume you’ve got a 220v model?

Good luck

:smiley_cat:

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Sorry for the confusion. It’s my voltage converter I was referring to when I mentioned the PSU

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