I am controlling 40 w　co 2 laser with audino From yesterday it will stop

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1

I am controlling 40 w　co 2 laser with audino
From yesterday it will stop if you set the laser output above 40%
Who else knows the cause?

Almost always it stops at this level
Raster processing is possible (only use within 40% of output) Laser output 20% (little output) or machining start can be activated with laser power turned off.

I would appreciate if someone who understands

I am sorry if I do not understand the meaning because I am trying Google translation
https://drive.google.com/file/d/1SO3dETzT_d7AqZ8cQQAIN5nV5YsESmR1/view?usp=drive_web

2

I am investigating the cause over various sites, but is there a possibility that electricity is charged and noise is generated in usb communication? Come to think of that, Earth is not taken, where should we take Earth?

3

I fixed it after I grounded it

4

can you can help me

https://plus.google.com/112997820906585766784/posts/gLBmHYWXxCR