They are easy to make. They also give you bragging rights if you make
Some Guy on Ebay sells a little book on how to do it for a few
dollars or you can get it from Lindsay books.
A small point, but I would just wire the garage for 220 single
phase(or the Austrailian equivalent) and the do the phase conversion in
As many others will tell you, used 3 phase motors are cheap and
available. You can round up the capacitors and other things easily if
you look around. Here is the USA I can buy 5 hp 3 phase motors for $10
to $20 (or less). I might spend $40 on capacitors and another $20 or
so on a relay, a box and some wire.
Proly the single hottest topic on rcm, no? :)
What's the relay used for? starting the motor, or perhaps switching the
Yeah, def'ly do the conversion after the main 220 panel in the garage.
Then, you can get ancillary 3 ph panels to your equipment.
Or, what I did to some extra 220 single phase panels, put another busbar
somewhere in the panel for the third leg. Now, altho this leg is not
protected, strictly speaking, the other two legs will be, which proly should
Iffin you want to dot yer i's and cross yer electrical t's, then you can get
single pole "feed thru" (I think) breakers, which have screw terminals on
both sides, that you can wire in to the third leg of yer equipment.
Or, if all you have is those two pieces, just get triple pole feed-thru
breakers for each machine, or a 3 p. fuse block, which might already be on
formerly Droll Troll
Can one get a corner grounded delta system with a RPC? I am not sure
of that. The two legs of 3 phase that come from utility, cannot be
grounded. The third leg could not be grounded, either, or else it
would not be 3 phase.
OK, you got a lot of good advice from people based in the USA. However,
they have a wierd power system, much less power available as a rule
than we do to normal dwellings.
My first suggestion is to get 3 phase power supplied. If it's available
on the street, shouldn't be a drama getting it. Never has been for me
and I've done this 3 times now. This is your single best solution.
Second suggestion is to buy a 240V 1 ph to 415V 3 ph converter from one
of the companies that sell them. Friend of mine in Sydney has done this
for his country place where 3 ph wasn't possible short of spending $40K
and he's happy with the result. Email me (the hotmail addy works) and
I'll give you his phone number.
Third, consider buying a couple of 240V in - 415V out (or 240V 3 ph
out) variable freq drives. Another friend of mine did this and he's
wrapt. Melbourne Machinery has the VFD's. Might need to reconfig the 3
ph motors fromm star to delta or vice versa, I never remember. Usually
simple, my B/port 3 ph motors it's just a matter of swapping bus bars
over to a different config and the diagram is inside the motor plate.
Fourth, build your own. Option for someone with a lot more time than
money. Personally I couldn't be bothered if I had any other choice.
I've always put 3 ph power on and forgot about it forevermore.
I'm looking at connecting my garage with three phase power, but using a
single to three phase converter. I will be running a mill and lathe with
a total of 4 KW. In Australia there are two companies which sell power
Would someone like to report first hand experience with these single to
three phase converts ?
Thanks in advance
[ ... ]
Here, that is correct, because our 220V is center tap grounded.
I believe that Oz, like the UK, uses only a 220 (or 240) volt
feed to residences, with one side of that grounded, so a corner grounded
delta should not only be possible, but actually difficult to avoid. :-)