Only 2 legs for 3 phase service...

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kwired said:
Count me in on asking the vendor to supply a machine that will operate on single phase.
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It's complicated. We're a small town. The supplier is more likely to say 'never mind, I'll give it to someone else'. Also, the other shop owner is a buddy, so I'm helping him out. :)

That being said, from a theoretical standpoint, would something like this work: http://thero.tk/s/9p

I know it's intended to go single phase to three phase, but ultimately I should be getting acceptable 3 phase out of this should I? I mean, this is basically what was suggested earlier, just in a pre-fabbed box where I don't have to try and source my parts in my small town.

Cheers.
 
AltonToth said:
It's complicated. We're a small town. The supplier is more likely to say 'never mind, I'll give it to someone else'. Also, the other shop owner is a buddy, so I'm helping him out. :)

That being said, from a theoretical standpoint, would something like this work: http://thero.tk/s/9p

I know it's intended to go single phase to three phase, but ultimately I should be getting acceptable 3 phase out of this should I? I mean, this is basically what was suggested earlier, just in a pre-fabbed box where I don't have to try and source my parts in my small town.

Cheers.
Click to expand...
My experience with static phase converters is the load needs to be pretty constant load. You need to fine tune the thing to the load to get as much voltage/current balance as possible. If the load does vary they don't seem to work so well.

As mentioned earlier, you have two phase conductors and neutral of a three phase source - I'd probably build an open delta transformer from that before I would go with a static phase converter.

Regardless of what you do, you need to consider things like whether or not the unit requires a neutral, whether it can be connected to high leg system or corner ground system, or if it absolutely must be connected to 208 vs 240 or vice versa.

Rotary or static phase converters will have more "unusual voltages" on the derived third phase then what some see as unusual from a high leg or corner ground system.
 
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