Well, I just got Passport #3 from Miller and it seems to work. I had to test it at B&R because they said Miller won't accept any more returns on it. Even though the unit failed within the first 12" of welding .035 solid with co2 both previous times . B&R said I must have a "line problem". Yeah, right. I'm gonna have to contact Miller about this. Even though the unit #3 works fine now, pardon me if I have a little worries about it still having a warranty. It SEEMS, I say SEEMS, that Miller may have 'bypassed' the duty cycle circuit altogether. Before, about when you would expect the duty cycle light to come on, say .035 solid at 65 speed for one or two minutes, it would just die. Now, at full output, it will never fail and the duty cycle never seems to come on. I ran a single slow bead up and down both sides of two 1"x1"x12" pieces of steel to a 1" 12"x6" piece of plate, and ran several other beads on the plate, all for about ten minutes and the duty cycle (20%) never kicked in (yellow thermometer light on, no weld). Maybe bigger Mosfets, maybe a faster fan, or just maybe I now have a working unit. I'm still a little paranoid though, especially since B&R claims Miller won't warranty the new replacement, "because of my power grid". I WANT to reccommend this unit, based on how its now performing, but if Miller won't honor a warranty because of their R&D or QC problems, I won't be buying Miller anymore. I have an HTP Invertig 201. Had for a year, never a problem. I have a Hypertherm. Had it for about a month. FLAWLESS. I have a single, clean, dedicated 240v line, and can only use one machine at a time. I never had a problem with either of my Maxstars (except being unable to run aluminum rod on the LE version, which runs fine now on the LF version) Anyhow, the most recent one seems to work.
18 years ago