@Andy_Shilling
24vps to C3D cable
…+24v to C3D vbb
…24v gnd to C3 gnd
C3D PWM to LPS cable. Twisted pair the best.
…C3D pwm (wherever you got it from before) to TL.
…C3D gnd (from pin near pwm) to LPS gnd.
BTW, did your old supply die?
Ok I was using P2.5 screw terminal for pmw. So I can use the Gnd terminal just along from it to connect to Lps. I’m guessing as long as they are ground together it doesn’t really matter what pin I use from the C3D.
@Andy_Shilling generally yes, ideally you just want the grd current for the PWM driver to return back to the driver’s gnd.
Excellent, and yes the old one died just before Xmas so I ordered the upgraded 60w and a new flyback for the old one just it the hope that was the problem. I now have the 40w sat as a spare with the new flyback.
@donkjr I am now nearly up and running now but as it stands I have no laser fire from laserweb/Cohesion3d board. I am using grbl as before and using pin 2.5 from the board but nothing. Test fire works well although being a 60w lps I can only put max 1.5v through otherwise I’ll be burning out the laser in no time.
Any idea if I should use the pwm pin from the board instead?
@Andy_Shilling
What PWM pin from what board?
How is the C3D connected to the LPS?
Via the TL pin on the LPS?
If so, try grounding the TL pin on the LPS without it connected to the C3D and with the Laser Switch on and all interlocks and water sensors closed.
If the laser fires then the problem is at the controller otherwise the LPS is not enabled.
@donkjr I have the
p2.5 on c3d connected to TL on lps
Ground on c3d to ground on lps.
I have just checked the TL to Ground and that fired, does that mean I need to change the pin on the C3D or possibly the ground location on the C3D?
@donkjr this is the ground I used should I change it to the Ground on the pwm terminal?
Which exact pin do you have the TL and ground connected to. Not clear which of these you used. Something must not be connected like it used to be :)?
The TL is on (p2.5) in the image above and Ground is connected to the terminal 2 screws to the left.
That gnd pin looks ok but try disconnecting it and see if that changes anything.
Is that where it was connected before you swapped out the supply?
Did you change the config file at all?
What do you have that you can look at the 2.5 pin with?
Does everything else on the C3D look like its working correctly, power, lights etc?
No it was wired differently, I’ll see if I’ve still got photos to refer to, the config remained the same and what do you mean look at the pin?
@donkjr Thank you kind sir you’ve done it again. I just needed to remove the ground wire altogether.
@Andy_Shilling ok that means that that minus is not really ground (I wondered).
Find a real ground near there. You can tell by measuring it to the C3D power supply ground with power off and a DVM on ohms …
I’m out at the moment be will check when I’m back but I think both C3D, psu and lps all give ground continuity. Any any G pin that I’ve checked on the c3d is the same.
On a side note maybe @raykholo could answer this one, I’m getting a disconnect sound from my pc when the laser fires, it doesn’t actually disconnect. Could this be something to do with the ground problem?
Is it a separate 24v psu in addition to the new lpsu?
You need a common ground between them, I’d prefer you do that directly instead of through the C3D.
@raykholo @donkjr
Ok so I have run a new ground wire between the 24v psu and the lps and I am still getting the disconnect sound when the laser is fired. Link below to the video file of that. what else could I try because I’m now quite confident everything is as it should be regarding the wires and the laser is actually firing and giving me the pwm control.
https://drive.google.com/open?id=1CKhmgstZ9xJXzMcEBV5Md0sVmKeUx9hb
@raykholo ideally the ground for the PWM signal should be derived from the same grnd the driver is connected to and as close to the driver as possible so that the return current does not flow through a ground loop to the DC supply and then the C#D and finally the driver.
+Ray is the gnd connection that +Andy disconnected actually gnd or is it the drain of a mosfet?
@Andy_Shilling is the “disconnect sound” occurring with the ground wire missing to the LPS? Your symptoms sound like you have a ground loop problem.