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Old 06-03-2016, 12:13 PM
Shade Tree Welder's Avatar
Shade Tree Welder Shade Tree Welder is offline
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Default Millermatic 350P Issue:

Background:
A month or so back I was welding on a friends boat over at his shop and my
MM 350P would just stop welding and the displays would go blank. Then it
would come back on and weld fine. I was an on off issue but the main
contactors would not open so I knew it had power. Very odd. But at my shop
it ran without issue.

I called Miller at the time and they suggested that it might be an open ground
as the electronics use ground for reference voltage. Called my buddy and let
him know he might have a floating ground issue at his place.

Life if fine and I carry on. Then back at the GTG the same problem started
happening, now I am questioning the machine and not the power supply this
time. But not much I was going to do about at Windy’s so I just waited until I
got home. Again, when I get home machine runs just fine, since the problem
is intermittent, they are a really bitch to troubleshoot. So this week when I
was working around here, it starts again. Okay, 3 different shops, two with
single phase and one with 3 phase and I have the same problem, it is
definitely the machine.

I called my LWS buddy Rick, and we discuss it. He gives me the Miller
number (800-558-3517) and he internal repair guy as well in Davenport, IA.
Armed with a little knowledge, I take all panels off, short the really big
capacitors and start looking for loose or burnt connections. I check the plug
and machine end of the power cables etc. Find nothing obvious.

Miller:
Second call to Miller, by the way, I call their number, short menu in English
with no Spanish options, and I have a real live human in 2 rings, he transfers
me to John who answers in one ring. You gotta love that! Less than 2 minutes
I have the guy I need on the phone!

Important part for MM 350P owners.
So I discuss the problem with Joe, explaining everything with the machine and
its history. Long story short they have seen this issue and there is a cable
between the main board and the display board that supplies power to from the
main board to the display board. The pins can get some corrosion on them
and they will cause and intermittent open, since the display board supplies the
settings for the machine the welder will not provide current without input from
the encoders (dials) on the machine. In 2007-8 they started using dielectric
grease on the connectors in the board to stop this from happening, with very
good success.

On the main board the connector is RC11 and on the display board the
connector is JP5. I will post some pictures. You have to take the front of the
welder off to be able to remove JP5. You cannot access the lock from the back
of the board.

So I cleaned everything up while I had the machine apart, and blew all the
dust out.

I will post the pictures in the next post.
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Last edited by Shade Tree Welder; 06-03-2016 at 03:56 PM.
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Old 06-03-2016, 12:25 PM
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Default

I'll bet that old Lincoln just has studs and nuts for connections Good to know the diagnosis though. Thank you for sharing.
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  #3  
Old 06-03-2016, 12:25 PM
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Default

Welder porn I
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  #4  
Old 06-03-2016, 12:27 PM
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Welder porn II

Dave, I think the hours and arcs reset when you turn the machine off, or
maybe it is a artifact of the power connection issue. But they are reset to
zero again today.
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  #5  
Old 06-03-2016, 12:47 PM
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Unless it is stored in a solid state type of memory that takes no power, I assume it resets when you short the capacitors and it can no longer maintain the memory, like your automobile radio.
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  #6  
Old 06-03-2016, 04:02 PM
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Follow up...

I sent an email yesterday to a friend at Miller, he is no longer in the light
industrial group. He forwarded the message to Kevin over in light industrial
and Kevin call me in the office when I was out in the shop on the phone with
Joe.

Back in 06 I had a buzzing contactor or transformer that needed to be
replaced and at the time they upgraded my programming and gate drivers.
Kevin was the guy who did that. Damn! They have the notes in the system
based on my serial number.

Also I left the machine on all day and when I was checking on it seem stable, I
have some welding to do this weekend so we will see how it holds up.
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  #7  
Old 06-03-2016, 10:39 PM
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Sorry to hear that it was the welder but happy to hear that you got though to the right people to get the problem figured out! Hopefully it performs as it should now. hmm, too bad you didn't take my offer to dispose of that welder for you though. Would have saved you the headache if troubleshooting it. :-)

Brian
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Old 06-03-2016, 11:41 PM
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Just as a note to any of curious type my sa 200 has yet to fail, need an update, had to reboot, had trouble with menus or just plain not welded in the last 71 years.

Also it serves as a pretty decent backup machine when a Miller goes down.


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Last edited by SmokinDodge; 06-03-2016 at 11:58 PM.
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Old 06-04-2016, 08:33 AM
JBFab JBFab is offline
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Quote:
Originally Posted by smokindodge View Post
just as a note to any of curious type my sa 200 has yet to fail, need an update, had to reboot, had trouble with menus or just plain not welded in the last 71 years.

Also it serves as a pretty decent backup machine when a miller goes down.

.....
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  #10  
Old 06-04-2016, 09:19 AM
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DAMN !! My MM350P may be a ticking time bomb......................
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