AC frequency harm 280DX?

[WillieB]

Soon after I bought my Dynasty 280 DX I read something from a source I can't remember. The gist was using 400 HZ will damage boards in the welder. I've played conservative, not exceeding 250HZ. What's the truth? Will it damage the welder?

[CODE4]

I am not sure why it would have a feature that is self destructive.

Try googling and find that source and post it.

[WillieB]

I can't seem to find it tonight. It was someone on one of the forums. Maybe while it is still under warranty I should try it. Would it put undue stress on the machine?

[cruizer]

Maybe incomming frequency, certainly not outgoing completely isolated hf freq

[WillieB]

Maybe incomming frequency, certainly not outgoing completely isolated hf freq

I don't remember the individual talking of HF. He was talking of turning the welding frequency to 400.

[snowbird]

Maybe incomming frequency, certainly not outgoing completely isolated hf freq

Just what i needed....

Does that mean that using HF in reverse polarity could harm a machine ????

Can it be done HF RP ? i have never tried it, is it used in some applications?

Does it apply to old "dinausorus" like dialarc 250 ac dc hf ???

needless to mention that i'm a tig noob

[CODE4]

Again, I ask, why would using a machine's features cause it to self destruct?

[johnnyg340]

Might have been me...

On Weldingtipsandtricks... I briefly related the experience of a customer who bought one when they were initially offered. He ran 400HZ and fried a board... Ran 400HZ again and fired the new board. Miller took the machine back and did indeed agree that it was a design issue. Never heard anything about it again. Perhaps they have solved the issue?

[zank]

Jody has been running his at 400 Hz with no problem. I haven't ventured up there myself.

[johnnyg340]

Very possible. Like I said, they may have the issue fixed, OR they saw a defect in his machine ONLY. But the message to him was clear: Your machine cannot do 400hz. He is now a happy owner of a 350...

[zank]

not a bad compromise

[WillieB]

I'll leave the question of HF on reverse polarity to greater minds than mine. The question of when you would use reverse polarity with TIG I pose to you. Reverse polarity would have limited application in TIG. It heats the tungsten real hot except at very low current. With SMAW or stick I doubt you want HF.

[WillieB]

On Weldingtipsandtricks... I briefly related the experience of a customer who bought one when they were initially offered. He ran 400HZ and fried a board... Ran 400HZ again and fired the new board. Miller took the machine back and did indeed agree that it was a design issue. Never heard anything about it again. Perhaps they have solved the issue?

Thanks for responding, I tried every search I could think of, but couldn't find it.


Jody says not much Earth shaking changes above 200 HZ but I wanted to see for myself. Logic says anything I can do to narrow the arc, concentrating the heat will give better penetration, melt what needs melting, and get me moved along quicker. Anything that shortens the time on the metal reduces HAZ and subsequently distortion.

As for the sound, I wear ear plugs, and I'm already quite deaf to high frequency sounds anyway. Still it's awful! I never knew what a happy, gentle sound I had from my 60 HZ Dialarc.

[H80N]

Link..???

On Weldingtipsandtricks... I briefly related the experience of a customer who bought one when they were initially offered. He ran 400HZ and fried a board... Ran 400HZ again and fired the new board. Miller took the machine back and did indeed agree that it was a design issue. Never heard anything about it again. Perhaps they have solved the issue?

while interesting... that reference is not very useful without a link to the original posts on WeldingTipsandTricks... to understand the context...

pls post that link...

[Ltbadd]

Who's Jody?

Jody says not much Earth shaking changes above 200 HZ but I wanted to see for myself.

???