Quote Originally Posted by sticks View Post
Ironically I am having the same issue with my PP50, but only when I am at the 50 amp setting after about 10 seconds of cutting.

Air PSI is 75+, good ground, 5/8 mild steel 1/16 to 1/8 standoff. Not tripping the overload, and the problem goes away at 47 amps.

3 water separators/filters, Motorguard air filter/dryer, inlet pressure regulated at 85psi running (pressure drop from 90+ when trigger is pulled).

Not trying to hijack the thread, but it applies.
Quote Originally Posted by everlastsupport View Post
It sort of applies to this thread, but would have been better to start a new one as the PP60 and the PP50 use different torches. I run my PP50 about 65PSI and my PP60 I run at 72. Sounds like you have dry air, good flow, good ground. So I would experiment with the air pressure. Make sure consumables are good as well.
Quote Originally Posted by sticks View Post
Will do. More air pressure for higher amps, or lower? Example - 20 amps - 65psi and 50 amps 70psi (more amps/more PSI)
Quote Originally Posted by performance View Post
Actually, lowering the air pressure isn't the best idea for cutting. It can be done, but I have found that there is a better way and you will get better results... Downsizethe consumables for the amperage is a better way. The air pressure you cited is too much on the input side and on the operating side. You should be at 90 psi NO more on supply while static. Operating you should be no more than 73 or so (officially). You can buy smaller diameter holes for the PowerPlasma torch. The S-25 consumables will fit the S-45 and are designed for low amp cutting at the same air pressure.

Is the arc stuttering or going on and off completely?
Quote Originally Posted by sticks View Post
On and off completely.

And like a fool, I bought the 75pc consumable kit which are all the same size tips, #8 if I had to guess. I wish you guys had a variety pack of the 6, 8, and 10s.

I'll adjust the inlet pressure to 90, and verify my operating pressure at the torch is 73ish. When it acts up again, I'll tinker with the air pressure up and down to see if it goes away.
OK, I adjusted my static input pressure to 88ish (as close as I can get to 90 with this regulator without going over). Cutting pressure is 73ish static, and drops to 67 or so while cutting. New tip and electrode. Still cuts out (arc quits) after a few seconds of cutting, and no overload light. I did try running the air up and down a little bit to see if it made a difference. Nope.

I drop it down to 47amps and the problem goes away - No I did not try 49 or 48 amps.

Power source is a Miller Bobcat 250, (10kw generator) plugged into my 240v 2 phase, but wired for 240v single phase on a 50a breaker. I have not hooked up an ampmeter to it yet to see what I am drawing, or verifying that the voltage is still holding at 240vac/60hz. That is going to take a little dismantling of parts to isolate individual legs.

Suggestions?