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Old 07-02-2015, 04:34 AM #1
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Default Flexmod P3 Issue

I am trying to get my Flexmod P3 (Interlock) setup for my laser engraver. I have 2w M140 from DTR. The issue I am having is the FM goes into protection mode if I go over 1A. I am using a dummy test load 6 diodes and 2w 1ohm resistor. I am measuring mv across the resistor to get the ma. I am getting to 1.052 mv then the protection kicks in. I am using my bench top power supply for the 12v to the FM and +5v to the M+.

I don't know what the issue is. I will be using the FM for analog laser engraving.

Any help would be great!!
Thanks


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Old 07-02-2015, 04:03 PM #2
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Default Re: Flexmod P3 Issue

anyone got anything?
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Old 07-02-2015, 08:55 PM #3
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Default Re: Flexmod P3 Issue

Are you certain you're adjusting the correct pots? What is the current with MOD at 0V? Do you have a LARGE heat sink on that TO-220? What is your supply voltage with that 1A load?
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Old 07-03-2015, 02:35 PM #4
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Default Re: Flexmod P3 Issue

Thanks for responding. I figured it out, everything is fine. I have an older bench top power supply (from the 80's). It has 12v posts, 5v, and a variable 2-20v. I was using the 12v for the flexmod and the variable for the 5v for the trigger. I didn't like that the 5v post is putting out 5.3v. My power supply has sat in the same spot for years. I moved it and that is when I noticed the 1A under the 12v post...... sigh.. I had never seen it and I couldn't imagine a power supply that only had 1A on a 12v post. The variable voltage has 2.5A. So I moved things around and it works fine. I hate it when crap like that happens. So often it is the stupid stuff that gets you. The sad thing is I am pretty experienced with electronics and I should know better.

Thanks for responding.
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