Laser turns off, screen blinks, controller restarts

Community Laser Talk
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First of all, good morning everyone, laser users, LB fans, technicians, and OZ… always a pleasure to come on the forums!

Well, basically what the title says… im using my machine and for some reason, the screen begins to blink, and the entire system resets. Oddly enough, even when I have the machine on, and am not currently using it, the error can occur and the restart happens as well.

ive checked all the cables… the power cables from the wall to the voltage regulator, and from there to the laser. i got a little piece of MDF and poked at all the cables around the gantry and laser head, ive tried to jiggle the wires that go to the controllers, and axis box things and what not, ive stuck my arm up the side of the machine to the bottom of the display, and jiggled those cables…

i cannot make the issue occur… so i cant really say hey, its this connection right here thats causing it.

so what do i do now?

its an 80w C02, i was cutting at i think 20speed and 30% power… not very high at all…

im posting the video on youtube now so you guys can see whats going on… this sucks.

Omtech 80w 2440 Pro - Stops mid engrave, have to hard power the machine
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Video 1
video 2

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Most likely, the 24 V power supply is failing.

Those power supplies are typically inadequate for the total current required by all the hardware; OMTech installed a 6 A supply in my machine with nearly 11 A of peak current.

As a result, the supplies tend to fail sooner rather than later, while produces baffling symptoms on the way out.

Replace the power supply with one capable of about 50% more current and it’ll likely solve all the problems.

2 Likes
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I Was having the same issue i ended up opening up the power supply and adjusting the voltage up and mine seemed to work

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@ednisley
Thanks for providing insightful info.
I’m having the same problem, or something very similar.
I’ve no-doubt made an incorrect assumption thinking the issue was due to the high-voltage supply and have gone and bought a new one (yet to arrive).
When you suggest that the 24v supplies are typically inadequate and to replace with one capable of 50% more current than needed (I’m def not an electrician so…) how do I estimate/calculate the current needs?
I’m running a 100w co2
Any advice appreciated.

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The power supply has a dataplate = sticker on the case with its output voltage and maximum current:

PXL_20251208_154011221 - OMTech laser - OEM 24V-5V power supply label
PXL_20251208_154011221 - OMTech laser - OEM 24V-5V power supply label1500×1125 268 KB

It was a dual-ouput supply:

But the power supply will (almost certainly) be mounted in such a way as to make that sticker invisible:

PXL_20251208_152415465 - OMTech laser - OEM 24V-5V power supply
PXL_20251208_152415465 - OMTech laser - OEM 24V-5V power supply1500×1500 344 KB

It’s on the left side, smushed against the Z axis stepper motor driver. :grin:

I extracted the OEM supply and replaced it with a beefier one, which precipitated a major battle because it did not fit the same way:

PXL_20251216_205658342 - Laser 24V Power Suppy - installed
PXL_20251216_205658342 - Laser 24V Power Suppy - installed1125×1500 370 KB

But, hey, I can read the label.

I had that power supply on the shelf, but it has a much higher current rating than needed even by my absurd standards.

If I were buying a new supply, I’d look for one with a 10 A rating that fit into the original space.

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Thanks so much, esp for going to the effort of adding the images and explanation.
My machines typically end up having undone all the perfectly neat and tidy wiring and placement too, after upgrades.

New supply ordered. Hopefully that’s the issue (or isnt, but the issue solves itself in the process of the swap).

Cheers.

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Those are the scary ones, because the cause may be lying in wait …

Let us know what happens next!

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