Could anyone help with the calls?
I’ve already tried to see the ones in the group here and nothing works.
If anyone here can take the image and make the connections using a paint drawing, I would appreciate it. I’ve done so many that I’m afraid of burning the machine/plate.
I don’t understand anything about electronics and I’m afraid of damaging something.
Thanks
Pedro Rodrigues
The connections, at least most of them are specified in the schematic and user manual at the github site.
It’s a standard lps, so it should wire up relatively easily.
You would want the L input to go through a switch to ground, this would enable the lps and a pwm to the IN terminal of the lps causing it to lase.
Do you have a chiller? It should be wired to the P input (water protect) that ensures the chiller is moving coolant.
| LPS | control | name |
|---|---|---|
| laser switch low enable | not applicable | L (TL) |
| laser switch high enable | not applicable | H (TH) |
| water protection | no output | P |
| signal ground | ground | ground |
| power control | pwm | IN |
| 5V | not used | not used |
| negative electrode | not applicable | ground |
This is a more normal marking – they are in the same order.
You’re likely not going to have a water protect output on your control boad, so you’d have to wire this to your sensor or ground. If you ground it, there is no way to protect the machine from you running with the circulating pump disabled.
Upper right of the control board is the pwm output, you only need the signal, although you can use this as a signal ground also.
The negative electrode return is used as a cathode (negative) connection for the tube. Most of us wire these to ground however you want to do it. FG is field ground and should work. I suspect in your photo, the blue wire is just a jumper to neutral.
Make sense?
If you have any questions, sing out 
The HV supplies on my shelf (similar to the M60) all arrived with a pigtail lead for the cathode connection and no separate Negative electrode of laser tube terminal (as in the MYJG50W), so I’m extrapolating a bit.
From what I can make out of the circuitry, the laser tube cathode connection goes through a current sensing resistor on the PCB, so it should not go directly to the FG / frame ground terminal. What the circuitry inside does remains a mystery.
The FG terminal should be wired to the machine frame to ensure the power supply case has a solid safety ground connection. In principle the mounting screws should do that, but …
Good evening.
I made this connection as shown in the image.
It cuts and makes lines, but does not engrave.
The laser does not fire anything that engraves.
What is wrong with the connection?
I suspect you have the same issue that I have. I believe your issue is that your minimum power is set too low during M4 operations. I’m running firmware 2.10 on my MKS DLC32 controller. It’s ignoring my $31 settings.
Assuming your $30=1000,
Try: $31=150
That sets the min power to 15%. If it does make a difference, your need to adjust it to your real min power.
Then see if it makes a difference. Maybe whatever firmware version you have on your board honors that setting. My version appears to ignore that setting. What firmware version are you using?
The spindle output should not be used here. It’s just an inverted pwm signal and isn’t driving the tube properly. When I had mine on the co2, I wired the L signal through a manual switch to ground. It was laser enable. In the drawing.
P should be run to a coolant switch to ground. When coolant is flowing, it pulls P low.
With L low, it will lase at whatever current the IN terminal has applied.
So you wouldn’t want low power to be set to 15%, it needs to turn off completely. $31 should be zero.
LC-0 is the pwm from the chip that drives a fet, which switches JP7-1 (spindle) to ground. J18-3 (IO32) is the diode laser signal.
Mines grounded from the cathode lead of the mA meter mount ground at the meter, same as chassis ground.
Going through any kind of resistor here would not be of any help, unless their voltmeter was across it… it reads current, the current is the same through both circuits, resistance or not.
NO, not with a tube laser. The min spec for $31 sets the power floor. The PWM signal drops to 0V during G0 moves. That pull to 0V disables the laser. Under G1 codes, the power floor is set by $31 and MUST be correctly set for M4 to correctly function. Otherwise, you’ll have inconsistent laser output. This doesn’t apply to solid state lasers. I believe the OP is using a CO2 laser, which does need this. This is known/documented.
To further make this harder for the OP, I suspect his firmware will ignore anything he sets $31. Hopefully they can report back soon.
I do agree with that.
I ran my dlc32 like this without any issues that I saw. I didn’t pound on it but it drove my 40W co2, properly, as far as I can tell…
It’d be nice to have a link to the known documentation about his … even for my own education.
If it’s high enough, it will lase all the time… how do you prevent that?
Given the hint, I remember the GRBL doc:
$31 - Min spindle speed, RPM
This sets the spindle speed for the minimum 0.02V PWM pin output (0V is disabled).
So the PWM output hits zero (or as close it can get) when the S value in the command goes below $31.
Which means the laser should shut off cleanly for small S values, which is pretty much what a CO₂ laser needs.
The resistor is inside the power supply for the usual M60 / ZYE boxes, where (I think) the supply’s control circuitry reads the developed voltage.
Perhaps the internal resistor develops a voltage for the remote current display intended to plug into the not-a-network jack on those supplies. That would explain why your supply is perfectly happy running without having the tube current going into that terminal.
Given the wild-and-wooly variety of clone / knockoff supplies, who knows? I’d wire it up according to whatever doc might have come with it, which surely shows the tube’s cathode lead should ultimately go to the appropriate terminal.
It makes no difference, if I read the voltage across an internal or external resistor, Current though the circuit is the same, one resistor or 10.
My lps says FG goes to chassis ground. My tubes cathode never went back to the lps, it was grounded to the frame when I got it.
So that supply didn’t have a pigtail coming out the back?
One wonders if 
Cathode wire was an option on the original BOM or a little flush-cutter work on the assembly line.
Helps confirm the internal resistor is not used for current sensing, which is valuable knowledge.
Ya learn something new every day around here …
I don’t know if that’s a valid conclusion. It will operate either way and the current reading should be the same.
Unless we can disassemble one, I think it’s still up in the air. The resistor could be in the display module itself, we just don’t know.
So would that be the connection?
Where do I turn on the L?
Water, air and extractor systems are independent of the machine.
What would the rest of the wiring look like?
Use the image to illustrate, thank you.
Using the center of the connector, is ground. So in effect you’re turning on the lps. I don’t think this is the best way as you could be in there and the pwm would turn on the laser.
I wired L through as switch to ground, for a manual laser enable.
