Hey guys, I recently bought a used red and black 500x700 cutter.

Lasers
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21

@Chris_Menchions Huh…

You measured:
From the P2.4+ to the VDD (+12 or +24VDC) and you got an open?
You may be missing a power jumper. But not to worry because I do not think you want this pin anyway.

The P2.4- may read open as hopefully it is the drain of a MOSFET.

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Lets move on to the wiring:
FYI This supply looks like it has the same connections as yours?

_ https://www.aliexpress.com/item/MYJG150W-new-CO2-laser-power-supply-150W-with-signal-fault-diagnosis-voltage-regulator-and-LED-display/32792418545.html _

Below is my recommendations for wiring.

Once wired I would leave the wire to P2.4- open and test the setup by grounding it.
With P at ground (enable switch and interlocks etc closed) the laser should fire when the wire on L is touched to ground.

Then you can hook up the controller and try it …

Google Photos

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I tested the+/-of p2.4. Sorry.

That is my psu yes!

Ok I will follow the instructions tomorrow after work and let you know. Thanks

23

Also where the 5k resistor I’m adding a 5k pot just to confirm with you.

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@Chris_Menchions that is a 5K pot ;)? Note the wiper …

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I’m a bit slow lol

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Ok so wired as your diagram the laser is always firing. this is hooked to 2.4 pos terminal.
without P and G it doesn’t fire which is correct.

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@Chris_Menchions does it fire all the time if you remove the smoothie’s PWM wire?

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I will check tomorrow

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On my k40 L is on ground p2.4 and gnd is on positive but it’s a different board that’s an smini…like sbase but without heat bed mosfet.

I did try to wire it that way and well it shorts out of course. Wonder if the board is bad…

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@Chris_Menchions first lets take the board out of the circuit. With L on the LPS connector “DISCONNECTED” and everything else wired as my drawing shows does the laser fire all the time?

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Ok I’ll do that this evening and get back to you.

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Yes it fires when not hooked up to the sbase. P is still tied to G

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Hopefully the psu isn’t fried. I seen it working a while back on the stock controller.

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Could the psu be labeled incorrectly?

35

I doubt it’s labeled wrong. We have something keeping the LPS enabled.

Leaving the controller wire disconnected.
Now disconnect the T wire from the supply and see if it fires all the time?

Btw what kind of pushbutton do you have on the T connection and what pins are u using the NC or NO connections?

36

I have nothing going to T. Never did hook anything to that. Only terminals I touched were L, p, g, in, 5v.

I have a guy with similar machine and psu going to send me pics of his but where this is not going to be the same controller I dunno what good it will do.

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Where would T go to?

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I’m confused did you wire per the drawing I posted?
Can you draw for me your version of what is currently wired?.

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Sorry I’m not using any pushbutton. I just want to get it running bare min then I’ll hook up the interlock and test fire.

What is nc and no?

40

I did wire it like the diagram except I left t unhooked as I don’t even have a button purchased yet. The P is short wire I jumped to G.

Once I confirm it functions properly I was going to connect the door switch etc and add a test button.