Hey guys, there’re a lot of infos here, but they’re confusing me, as they change a bit from topic to topic!
Right now i’m trying to fire my co2 tube, but no success! What’s wrong?
Laser and PS are working when i push PS test fire button!
I’m using a external 12v PS to power the MKS, should i link the 12v PS Ground to the Laser PS Ground?
Spindle ground, really isn’t… J7 pin 1 is the spindle ground, but it isn’t ground as you can see in the schematic. It goes to ground through Q1 when the pwm signal goes high.
J18 is the ttl output, use the ground there as there is no real current flow to the lps, just normal led current for the lps inputs.
Pick up ground at J18. So remove the green wire…
The ground from J18 is enabling the lps all the time… Usually you’d run L through a console switch to ground, for laser enable.
Make sense?
Do you have a pot for current control somewhere? This is most common, like a K40 is wired. It has the pot wiper going to IN, one to ground and the other 5V. H is wired to the pwm signal.
Good luck
Got it! Now it’s working!
But now i’ve other issue, it’s not firing under lower power levels! ( If is set above 40% in Lightburn it works!)
What could be?
Did you follow the Lightburn grbl setup?
It’s likely that the $30 and the S-value Max setting in the device settings are not equal. This is covered in the link above.
Do you have a voltmeter? The pwm output should be relative to the ttl voltage level or 5V. At 50% pwm, it will read 2.5V and at 20% it will read 1V… You don’t need to lase to check this, so turn the lps off.
Hopefully the setup will solve the power issue.
Most machines will not lase below a certain level, mine quits lasing as I drop power below ~10%.
What was the actual fix?
Good luck
Ahh ok! thx
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