In article ,
Ignoramus6304 wrote:
:Besides the 10 hp motor that I use as an idler, I have a 7.5 HP motor
:that is rated for 200V. I know that it runs fine from 220V three phase.
:
:I am thinking what to do with it and am considering making a "phase
:converter kit", with the motor, furnas contactor, and 2 capacitors,
:and a regular light switch wired all together, and listing this kit on
:ebay, for say $100. The buyer who buys it would mount it in his own
:enclosure, but it should be ready to go once mounted.
:
:My issue is that I do not want to sell a combo that will burn out due
:to inappropriate voltage.

Most single phase service is nominally 120/240V, and if that "240V"
service is running at the high end of its tolerance range it can
actually be close to 260V. I'd be seriously concerned that 260V
would saturate the iron in a 200V motor.

--
Bob Nichols AT comcast.net I am "rnichols42"

Ignoramus6304 wrote:

Besides the 10 hp motor that I use as an idler, I have a 7.5 HP motor
that is rated for 200V. I know that it runs fine from 220V three phase.

I am thinking what to do with it and am considering making a "phase
converter kit", with the motor, furnas contactor, and 2 capacitors,
and a regular light switch wired all together, and listing this kit on
ebay, for say $100. The buyer who buys it would mount it in his own
enclosure, but it should be ready to go once mounted.

My issue is that I do not want to sell a combo that will burn out due
to inappropriate voltage.

Any thoughts?

i


I made a few phase converters for sale and quickly came to the
conclusion that it was not a good way to make a buck. Lots of time
involved with not a lot of return. A kit gets around this, but how sure
are you your components (like the contactor) are sized right?

The other way to think about it: now that you have 3 phase, some day
you're going to really wish you had kept that 7.5HP motor. They don't
take up much room...

Steve

Steve Smith wrote:


Ignoramus6304 wrote:

Besides the 10 hp motor that I use as an idler, I have a 7.5 HP motor
that is rated for 200V. I know that it runs fine from 220V three phase.

I am thinking what to do with it and am considering making a "phase
converter kit", with the motor, furnas contactor, and 2 capacitors,
and a regular light switch wired all together, and listing this kit on
ebay, for say $100. The buyer who buys it would mount it in his own
enclosure, but it should be ready to go once mounted.

My issue is that I do not want to sell a combo that will burn out due
to inappropriate voltage.
Any thoughts?

i


I made a few phase converters for sale and quickly came to the
conclusion that it was not a good way to make a buck. Lots of time
involved with not a lot of return. A kit gets around this, but how sure
are you your components (like the contactor) are sized right?

The other way to think about it: now that you have 3 phase, some day
you're going to really wish you had kept that 7.5HP motor. They don't
take up much room...

Steve


I've built a few phase convertors to sell too, and my experience was
about like you say.

I'm afraid what Ignoramus would find dealing a kit is people picking
your brain (wasting your time if you're looking to make a buck) and then
picking up their own parts. By the time you get them aware of how it
works and how to make it work well they've got the picture and won't
need anything more from you..

But.. I've been wrong before, maybe give it a shot, might end up with a
new business.

John

So how do you know a 50A contactor is good enough? You've built how many
converters?

I don't mean to be difficult, just pointing out what seems like an
obvious issue.

Steve

Ignoramus6304 wrote:

On Sun, 31 Jul 2005 19:33:08 -0400, Steve Smith wrote:


I made a few phase converters for sale and quickly came to the
conclusion that it was not a good way to make a buck. Lots of time
involved with not a lot of return. A kit gets around this, but how sure
are you your components (like the contactor) are sized right?



A 50 a furnas contactor should be good enuf...



The other way to think about it: now that you have 3 phase, some day
you're going to really wish you had kept that 7.5HP motor. They don't
take up much room...



I dunno, do you have any ideas regarding how it may be used in the future?

And, again, there is this 200V issue... it is rated for 200 volts.

i

Ignoramus21687 wrote in
:

On Mon, 01 Aug 2005 09:08:51 -0400, JohnM wrote:
Steve Smith wrote:


Ignoramus6304 wrote:

Besides the 10 hp motor that I use as an idler, I have a 7.5 HP
motor that is rated for 200V. I know that it runs fine from 220V
three phase.

I am thinking what to do with it and am considering making a "phase
converter kit", with the motor, furnas contactor, and 2 capacitors,
and a regular light switch wired all together, and listing this kit
on ebay, for say $100. The buyer who buys it would mount it in his
own enclosure, but it should be ready to go once mounted.

My issue is that I do not want to sell a combo that will burn out
due to inappropriate voltage.
Any thoughts?

i


I made a few phase converters for sale and quickly came to the
conclusion that it was not a good way to make a buck. Lots of time
involved with not a lot of return. A kit gets around this, but how
sure are you your components (like the contactor) are sized right?

The other way to think about it: now that you have 3 phase, some day
you're going to really wish you had kept that 7.5HP motor. They
don't take up much room...

Steve


I've built a few phase convertors to sell too, and my experience was
about like you say.

I'm afraid what Ignoramus would find dealing a kit is people picking
your brain (wasting your time if you're looking to make a buck) and
then picking up their own parts. By the time you get them aware of
how it works and how to make it work well they've got the picture and
won't need anything more from you..

But.. I've been wrong before, maybe give it a shot, might end up with
a new business.

Thanks.

Based on common sense, it is not really a good business for me
personally. For little side gigs, selling liquidated industrial
equipment or military stuff is more fun and profitable. Especially now
that I can test the 3 phase items. For example, I have a DC motor with
a 3 phase controller, that I could now test, and based on bid amounts
I think that the converter already paid for itself. However, I have a
motor that I need to get rid of, and everything else that could come
with it. (as other said, 200V motor may not be suitable). Why not
connect that stuff with wires, label it "phase converter kit", and
sell it to someone who needs a cheap phase converter.

I may sell phase converter kits consisting of capacitors, a furnas
switch, a regular light on/off switch, all wired and labeled
properly. The buyer would need to buy his own 3 phase motor and
connect it to pre-labeled wires with wire nuts. There would be
pre-labeled input lines and pre-labeled output lines.

Do you know how to spell "liability" or "law suit"? Building one for
yourself is one thing. Producing a kit for sale is completely
different, not to mention that you're using parts of unknown origin.

-- Geoff