dynasty 200dx shuts off when trying to weld AC

[travis4t]

as the title says, i have a 2011 dynasty 200dx, a little over 100 hours on it. it welds dc AWESOME. like a dream really. but I'm having trouble with AC. it welds awesome with AC for a few minutes, then the machine will keep restarting after i start an arc. the machine is running on 110v, i had just switched it over to 230v today but have not had a chance to use it, but i don't think this is the problem.

to summarize

-welds DC like a dream
-running on 110v
-welds ac perfectly for about few inches then continues to "reboot" before i can even start a puddle
-2011 and out of warranty.


since the machine is out of warranty, i will not be bringing it to the dealer for service because for the price i can just invest in a new one with a warranty.


i don't mind spending the 4-500 on a board if someone has a hunch as to what this could be.

i know its a shot i the dark but i figured it was worth a shot. thanks in advance!

[H80N]

Until "Criuizer" or one of the Miller TIG techs check in

The first thing that I would do is to reset it back to the factory defaults...............

It is possible for it's little brain to get confused..... and display psychotic behavior....

soooo.... sometimes a reset will clear things up................

BTW....PLS post your serial number

[travis4t]

s/n MB070256L i was going to try the factory reset, i haven't had a chance to mess with it. was in the middle of welding an intercooler on a tri-axle in a yard when it took it finally kicked the bucket. had to limp the truck to a friends shop and use his dynasty 350.

[travis4t]

i had just done a reset, and it did work, but i only laid down a few inches of bead. i have had this problem intermittently, but never has it not really worked at all. hopefully that was the problem. fingers crossed. maybe someone has a more technical answer then that though.

[piniongear]

I have no technical knowledge myself, but I wonder if the problem is caused by the high frequency extinguishing after starting the weld?
I say that because you are welding with it set to AC.
pg

[travis4t]

well, the machine literally shuts off and turns back on, by its self, not really just stopping the arc if that makes sense

[gnforge]

If this is happening on 110 volt. <br />
1st. Question, what amps are you welding at? <br />
You are limited on amps with 110 input....<br />
You will get more amps on DC but both are restricted with 110. <br />
Next question what is powering it, generator or shop supply? And are you using extension cord and if so how big is it. <br />
If you are welding or trying to weld higher amps than the input will handle the Dynasty will quit welding... Then after a short time will reset and you can start again. Protecting itself. <br />
My Big 40 only puts out 3000 watts and even on 220 volt my Dynasty 200 will do the same thing if I'm trying to Tig over 150 amp AC. <br />
Just a thought to check out. <br />
Greg

[piniongear]

well, the machine literally shuts off and turns back on, by its self, not really just stopping the arc if that makes sense

OK, I misunderstood, as I thought it quit welding after a short time but did not come back on.

I too own a Dynasty 200DX and weld quite a bit of aluminum.
Some months back I started a bead and the machine quit welding after maybe 1 inch of bead.
I restarted the arc again but it just made a light 'pop' and would not start again.
I thought for sure I may have blown a board.

Since my tungsten had developed quite a ball on the end I resharpened the tungsten and put it back in the torch.
The arc started beautiful and I welded the rest of the day with it and have not had it happen again.
I am not suggesting the tungsten has anything to do with it, but this is what I did when my arc went out, which sounds like what you are experiencing.
I do not think the voltage has anything to do with it either because using 110V just limits you to a lower heat range and reduced duty cycle.
I run my 200DX on 220V three phase power, and this has only happened one time to me, but it did happen.
Maybe Cruiser has a suggestion for you on what may cause the problem. I will be waiting to hear his comments.
pg

[travis4t]

thank you for all the input,

i am running it off 110,( though i literally just bought the plugs to run is off 230, which i will try next) I'm not sure that i could be reaching the duty cycle, as i tried starting an arc and keeping it at low amps to see if it would shut off and it still did, i also tried moving the ground 2" away from the joint and it still shut off. as i mentioned i did do a factory reset, but i had limited time and i only ran an couple inches of bead and it ran nice, i think I'm going to have to try it out and put it through its paces to see if that was the issue

i had tried 2 different tungsten green and arc time tungsten

oh also, this has happened on my household 110 with 20amp breaker as well hooked up to my trailblazer 325

[fabricator]

May wanna check the nuts on the inside of the output studs they can become loose and cause issues.

[gnforge]

It's not really duty cycle as would normally happen when welding near or at limit if plugged into 220 volt with 50 amp or more available. <br />
It's related to input. <br />
Keep in mind if using any extension cord that will drop input and cheap or light cord is much worse. <br />
As I said mine does that even on 220 due to my older big 40 only has 23 amp max on 220 <br />
And it does not trip breaker at welder. <br />
I would try on good reliable 220 volt 50 to 60 amp service supply first to narrow down and verify problem.

[cruizer]

Open it up, and with a philipps screw drive tighten the screws on plastic caps on the horizontal mother board. also with the rubber/ plastic end of that screw driver tap both boards down as they tend to loosen off

[travis4t]

you the man! I'm going to give it a shot next time i use it, hopefully soon. i love the machine lol.

[travis4t]

Open it up, and with a philipps screw drive tighten the screws on plastic caps on the horizontal mother board. also with the rubber/ plastic end of that screw driver tap both boards down as they tend to loosen off

so i finally used my dynasty on ac again, and what ever i tried did not fix it, so i took off the cover to try what you said.... but to be honest i didn't see any screws on the horizontal board am i missing something?

[shootist2]

My best understanding of these machines is the ac is converted back from dc after the igbts. So it's an additional circuit. Would explain why you are good on dc.