[TheForge] Fwd: Shop tools & layount (3-phase converter)
Ralph Sproul
[email protected]
Wed Jan 21 12:32:00 2004
Thanks Pal, I knew I could count on you to help me out. :-)
Ralph
----- Original Message -----
From: "John Newman" <[email protected]>
To: <[email protected]>
Sent: Tuesday, January 20, 2004 10:48 PM
Subject: Re: [TheForge] Fwd: Shop tools & layount (3-phase converter)
> When you get the rebuilding done Ralph, you should send the hammer up here
till
> they get three phase closer to you : ) I have three phase in the new shop
and
> can take care of the hammert for you till you get the three phase.
>
> John
>
> Ralph Sproul wrote:
>
> > Well, Maybe I ought to fess up as to what I'm really thinking!
> >
> > The Nazel 3B I'm rebuilding has a 575 volt, 3 phase motor that
runs
> > at 875 RPM. So, I was thinking of making a 10 Hp phase converter that
would
> > make 240 - then going with transformers to boost the voltage to the
motors
> > correct plate requirements. I have a 10 Hp idler motor available to me,
and
> > the transformers off a really large industrial control panel with high
> > voltage ratings.........so I was wondering if that might be an option as
> > compared to taking a tractor PTO to run the pinion gear to the hammer,
or if
> > it came right down to it......... maybe a chevy Cavelier front wheel
drive
> > friction unit developed a few miles north of here. (Oh, Hi Mike)
> > :-)
> >
> > Ralph
> >
> > PS, 3 phase is not an option - the nearest line is miles from
here.
> >
> > ----- Original Message -----
> > From: <[email protected]>
> > To: <[email protected]>
> > Sent: Monday, January 19, 2004 10:47 AM
> > Subject: Re: [TheForge] Fwd: Shop tools & layount (3-phase converter)
> >
> > > Yes, to get optimum performance you should add run capacitors,
> > > especially if you are only running a single motor off of the
> > > converter. I expect that your unit has both run and start. The
run
> > > capacitors are there to balance the current, rather than voltage.
> > > For the average home shop where you just want to be able to run that
> > > single bargain industrial machine I would just wire up a second motor
of
> > > same or larger size as a rotary converter, use a rope to start it.
If
> > > your machine motor gets hot with your usage, then I would go to the
> > > trouble of balancing the current with capacitors, otherwise just keep
it
> > > simple and be happy. The power company doesn't measure power factor
> > > for residentials. For your situation Ralph, it would be worth
> > > monitoring the current with an amp meter and adding capacitors as
needed.
> > >
> > > Charles
> > >
> > >
> > > Ralph Sproul wrote:
> > >
> > > >Charles, Thanks for writing this reply to the converter topic.
> > > >
> > > >I have one question. On the Static converters your mentioning the
size
> > of
> > > >the capacitors for starting and running loads. Does one have to
"tune"
> > the
> > > >third leg of a rotary phase converter with capacitors?
> > > >
> > > >I'm asking as the store bought 7 1/2 HP rotary phase converter that
was
> > > >included in my Iron worker package deal has a bank of capacitors in
> > > >it.........is this just for starting? or is this to bring the
> > manufactured
> > > >leg up to acceptable voltages?.......or both?
> > > >
> > > >
> > > >
> > >
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