Hello guys.
Recently i build a DIY Co2 laser cutter using the MKS DLC32 v2.1 controller.
The Co2 tube is a 40W powered by a black LPSU.
Everything works fine Lightburn talks to the board and gantry moves as expected.
The problem is that when i am trying to cut something after a few seconds i get a disconnection with the following message.
Spindle negative is not ground. J7-1 is labeled as spindle -
If you look at the schematic, it’s switched to ground via Q1 when the pwm goes to a high state.
J18-2 is the ground for the led module and the board. I’d suggest this go to the lps G pin, for a signal ground.
On your lps, IN is the current control and L is the laser enable. I’d suggest you wire L through your laser enable switch. This would manually ground it when you want the laser enabled.
Many are wired like this… What you are doing it enabling when the pwm goes high… so there isn’t any advantage to doing this and there may be a disadvantage depending on the pwm period.
This probably isn’t why the controller is failing.
The error message seems to indicate it’s going through a power cycle. Where do you get the 12 or 24V for the DLC32?
After further investigation it turned out that there was an EMF (probably) from the LPSU causing the MKS DLC to reset.
I move the LPSU further away to other side of the frame and it looks more promising.
I will test it more thourogly tomorrow.
Any one with same experience?
Any idea how to shield the LPSU or the controller. A faraday cage maybe?
Dear jkwilborn
Thank you for your reply.
With the current connection it seems to work fine but i’ll apppreciate it if you can provide me a small diagram of how it should be correctly connected.
