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Miller SRH-333/Hanovia 3 Phase to Single Phase Conversion


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  #61  
Old 08-12-2019, 12:03:32 AM
dkamp dkamp is offline
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Default Re: Miller SRH-333/Hanovia 3 Phase to Single Phase Conversion

Well, with those capacitors installed, when you go to strike an arc with welding leads, make sure you're extremely well protected. The instantanious current of those capacitors discharging will probably turn your welding rod into a fuse... that's a serious can of electrons you'll have bottled up there.

Keep in mind that a constant-current welding power supply has two functions: First is to provide a proper voltage for a managable arc... and the other is to provide a stable current that varies only slightly with arc. The inductance of the windings makes a welder self-limiting, either as a constant-current, or constant voltage supply. Adding a buttload of capacitance turns it into a very... well... it'll bite really hard.
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Old 08-13-2019, 12:36:12 AM
dalmatiangirl61 dalmatiangirl61 is offline
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Default Re: Miller SRH-333/Hanovia 3 Phase to Single Phase Conversion

Your concerns have been noted and recorded! I looked at all versions of SRH333 on Millers site today, and none show the exact circuit diagram for my machine, main difference being the lack of Z2 (transformer) which my unit has. I did find mention (in SRH333 manual) of an optional "start control" for easy arc starting on thin materials, only available for Gold Star 333 and 444, yet no description of what is involved in the circuitry. In looking at manuals I see no Gold Star 333 or 444.

In looking at the SRH manuals, all versions have the .05uf caps, only some versions have the .5uf caps. In camparing your schematic to my schematic, I think your .5uf capacitor is in a different part of the circuit, or at least its drawn that way, as best I can tell.

Without definitive info, I don't know what else to do than try it

If I'm still around I'll give an update tomorrow.
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Old 08-14-2019, 07:56:16 PM
dalmatiangirl61 dalmatiangirl61 is offline
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Default Re: Miller SRH-333/Hanovia 3 Phase to Single Phase Conversion

Well I didn't dieded. Just finished initial testing and it seems to weld great, nice easy arc start, nice quiet arc. Initial testing was done using some old stock, long open can, 7018 rods, 1/8" electrode, reverse polarity (electrode positive). seemed to weld best between 75% to 100% on amperage control knob, low negative, have not tried high negative yet. No idea what meters are reading, or if they even work, leads are 50' long and I'm welding outside. Did stick the rod a couple times, something on machine did not like that, maybe contactors chattering?

Caveat: As for my description of how its working, I have not stick welded in 30 or so years, so not a lot to compare to
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Old 08-14-2019, 08:39:04 PM
Wayne 440 Wayne 440 is offline
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Default Re: Miller SRH-333/Hanovia 3 Phase to Single Phase Conversion

After 99 months and 30 days, you have a functional welding machine. That is faster results than some of my projects.
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Old 08-24-2019, 11:23:07 PM
dkamp dkamp is offline
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Default Re: Miller SRH-333/Hanovia 3 Phase to Single Phase Conversion

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Originally Posted by Wayne 440 View Post
After 99 months and 30 days, you have a functional welding machine. That is faster results than some of my projects.
I resemble that remark, too...
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