dyn 200 output on 120v ?

[aphexafx]

the machine only got to 199 amps, so MILLER owes me 1 amp

Hehe! Thanks for letting us know your findings.

[aphexafx]

the Dynasty 200 does NOT need 3 phase power for any reason other than if you happen to have it.

Hey HAWK,

All of the weldors I've talked to...talk about how three phase power gives them a better performance (because the rectified three phase wave is steadier and averages higher). I've always wondered if this is something you can really notice. Is that what they feel, or are they just misinterpreting the stiffer current that three phase must provide?

And so, for inverters like the Dynasty, the input power is rectified and then pulsed at high frequency - thru the transformer - and then re-rectified, right? If I understand, then this re-rectified DC current is either sent out of the unit for DC welding, or polarity switched at whatever frequency for AC output, right? So, IF three phase power gives better performance on traditional machines BECAUSE of rectification, it doesn't matter to an inverter because it samples whatever power it needs and it doesn't matter what the input waveform looks like...right?

Wait I confused myself...no that makes sense. If anyone can parse my blabbering, I'd be curious to know the answer.

I hope I don't regret this question in the morning...beer? what?

Thanks!

[Tailshaft56]

Just read the inverter description from the Miller tig handbook and looks like you are exactly right. Since the frequency is much higher than 60 hertz the transformer can be much smaller and lighter. One other interesting sidenote is that inverter technology was first conceived in the 1940s but was not successfully marketed till the 1970s. So much for new unproven technology. LOL


Dennis

[fun4now]

tailshaft56

by new tecnolegee we realy mean newly afordable to the masses.

5years ago i would never have imagined having a plasma cutter in my lil back yard shop. yet we can now have a plasma cutter for under $1000.00 same with the inverters it just wasent put to practical use in the publice although they did hit the market several years ago, gust not wide spred. however the dynasty series has several years of real world usage behind it giving miller plenty of time to work out the so called bugs, resulting in a well built reliable welder you can depend on.

[HAWK]

Hey HAWK,

All of the weldors I've talked to...talk about how three phase power gives them a better performance (because the rectified three phase wave is steadier and averages higher). I've always wondered if this is something you can really notice. Is that what they feel, or are they just misinterpreting the stiffer current that three phase must provide?

And so, for inverters like the Dynasty, the input power is rectified and then pulsed at high frequency - thru the transformer - and then re-rectified, right? If I understand, then this re-rectified DC current is either sent out of the unit for DC welding, or polarity switched at whatever frequency for AC output, right? So, IF three phase power gives better performance on traditional machines BECAUSE of rectification, it doesn't matter to an inverter because it samples whatever power it needs and it doesn't matter what the input waveform looks like...right?

Wait I confused myself...no that makes sense. If anyone can parse my blabbering, I'd be curious to know the answer.

I hope I don't regret this question in the morning...beer? what?

Thanks!

YOU ARE RIGHT! THE DYNASTY INVERTERS DO NOT KNOW THE DIFFERENCE BETWEEN 1 AND 3 PHASE POWER AS FAR AS ARC QUALITY IS CONCERNED. The real difference with the inverters is the 3 phase power allows the rectifier bridge and input filter capacitors to work under much less load. This allows for the higher duty cycles per amperage output over 1 phase ratings on some machines. For example the DC (DUTY CYCLE) ratings are the same for the Dynasty 300 for 1 and 3 phase while the DC ratings are dramatically different for the ALT304 and XMT 304 between 1 and 3 phase. Even though these 2 inverters are listed as 225 amps at 60% on 1 phase they are capable of the full 400 amp output on 1 phase at approximately a 50% reduced DC. RE: since these machines are rated at 400 amps for 30% DC on 3 phase power you can still get 400 amps at 1.5 minutes on 1 phase. The rectifiers and filter caps are working much harder on 1 phase than 3 phase to achieve this output though.