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Jim.
Assuming you have done your sums and applied Ohms law the 4 amp flexmod and a 24 volt psu you should draw approx 0.125 amp at 3 watts easily coped with by the unit.
Are you sure the flexmod P3 has switching capabilities?
Are you using Aerduino?
I haven't done a laser conversion nor do I want to but am interested in others results.
I can't help with Mach3 either, they are a bunch of tossers only interested in flogging what they have now and not developing to meet future needs.
Their software will fail when M$ withdraw support for win7 32 bit unless they do something now, I have fallen out with them big time over this as a win 10 tester.
Development of drivers is required, blaming M$ is not good enough, nothing has been removed just moved and I showed them where it was moved to and they refuse to act.
Switch to Linuxcnc if you want to progress.
Back to flexmod P3 have a look here if you haven't already.
CNC Laser for Printing Images and Engraving - Shapeoko 2 based : Setup the Laser Driver (FlexMod P3)...

And this may also help.

https://www.youtube.com/watch?v=kxXQ4d9owMs

<blockquote data-quote="Grump" data-source="post: 175391" data-attributes="member: 232">Jim. Assuming you have done your sums and applied Ohms law the 4 amp flexmod and a 24 volt psu you should draw approx 0.125 amp at 3 watts easily coped with by the unit.Are you sure the flexmod P3 has switching capabilities?Are you using Aerduino?I haven&#039;t done a laser conversion nor do I want to but am interested in others results.I can&#039;t help with Mach3 either, they are a bunch of tossers only interested in flogging what they have now and not developing to meet future needs.Their software will fail when M$ withdraw support for win7 32 bit unless they do something now, I have fallen out with them big time over this as a win 10 tester.Development of drivers is required, blaming M$ is not good enough, nothing has been removed just moved and I showed them where it was moved to and they refuse to act.Switch to Linuxcnc if you want to progress.Back to flexmod P3 have a look here if you haven&#039;t already.<a href="http://www.instructables.com/id/CNC-Laser-for-Printing-Images-and-Engraving-Shapeo/step8/Setup-the-Laser-Driver-FlexMod-P3/" target="_blank">CNC Laser for Printing Images and Engraving - Shapeoko 2 based : Setup the Laser Driver (FlexMod P3)...</a>And this may also help.<a href="https://www.youtube.com/watch?v=kxXQ4d9owMs" target="_blank">https://www.youtube.com/watch?v=kxXQ4d9owMs</a></blockquote>

[QUOTE="Grump, post: 175391, member: 232"] Jim. Assuming you have done your sums and applied Ohms law the 4 amp flexmod and a 24 volt psu you should draw approx 0.125 amp at 3 watts easily coped with by the unit. Are you sure the flexmod P3 has switching capabilities? Are you using Aerduino? I haven't done a laser conversion nor do I want to but am interested in others results. I can't help with Mach3 either, they are a bunch of tossers only interested in flogging what they have now and not developing to meet future needs. Their software will fail when M$ withdraw support for win7 32 bit unless they do something now, I have fallen out with them big time over this as a win 10 tester. Development of drivers is required, blaming M$ is not good enough, nothing has been removed just moved and I showed them where it was moved to and they refuse to act. Switch to Linuxcnc if you want to progress. Back to flexmod P3 have a look here if you haven't already. [url=http://www.instructables.com/id/CNC-Laser-for-Printing-Images-and-Engraving-Shapeo/step8/Setup-the-Laser-Driver-FlexMod-P3/]CNC Laser for Printing Images and Engraving - Shapeoko 2 based : Setup the Laser Driver (FlexMod P3)...[/url] And this may also help. [url]https://www.youtube.com/watch?v=kxXQ4d9owMs[/url] [/QUOTE]

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