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Posted by terry on October 10, 2007, 8:53 pm
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> dan wrote:
> > I have a Sears air compressor that is 240 and uses a different plug.
> > It's a PITA because I have to add a new (240) outlet to every house I
> > move to. Can I simply convert the motor to 110? How difficult is this?
> > Or do I need to buy a new compressor?
> Tell us the (real) horsepower of the motor or how many amperes it draws
> at 240 vac and lots of guys here will be able to give you a more
> definitive answer.
> My guess is that unless you imported a small compressor from somewhere
> where 220 or 240 is the standard "household voltage" it's probably got
> such a large motor that you'd be hard pressed to run it off a 120 volt
> 20 ampere circuit.
> I said (real) in my first paragraph because more often than not the
> advertised horsepower of air compressors and vacuum cleaners is
> exagerated hype. They use some stupid "peak horsepower" measurement of
> the energy the motor puts out when they apply a load which is large
> enough to cause it to stall.
> Jeff
> --
> Jeffry Wisnia
> (W1BSV + Brass Rat '57 EE)
> The speed of light is 1.8*10^12 furlongs per fortnight.
Agree. Some motors are dual voltage and you can alter the
connnections. But motor will take at least twice the current on 120.
Also the starting curent of a 2 HP motor, for example will/may be much
higher than when 'running'.
My neighbour modified his dual voltage bench saw motor from 240 to
120.
But encountered a) A lot of voltage drop on 120 volts and b) The
circuit breaker would sometimes trip.
Had to suggest to him that he install a a 240 outlet and convert back
to 120 volts.
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Posted by Toller on October 10, 2007, 7:54 pm
show/hide quoted text
>I have a Sears air compressor that is 240 and uses a different plug.
> It's a PITA because I have to add a new (240) outlet to every house I
> move to. Can I simply convert the motor to 110? How difficult is this?
> Or do I need to buy a new compressor?
You move that much?!
Some 240v motors can be changed; others can't.
Normally they will give amperage for both 240 and 120v if they can.
There are exceptions; my 2hp dust collector says it is 240v only, but I
opened it up and found the conversion was simple. I called the manufacturer
about it. They recommend 240v only because 120v will lead to excessive
voltage drop.
So, if it doesn't show it as being 120/240, check the 240 amperage. If it
is 9a or more you probably wouldn't want to run it on 120v even if you
could. If under, it might be worth digging further.
(I did convert the DC to 120v, putting it on a 10 gauge multiwire circuit;
so excessive voltage drop)
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Posted by Steve Barker LT on October 10, 2007, 8:57 pm
how 'bout quit moving?
show/hide quoted text
>I have a Sears air compressor that is 240 and uses a different plug.
> It's a PITA because I have to add a new (240) outlet to every house I
> move to. Can I simply convert the motor to 110? How difficult is this?
> Or do I need to buy a new compressor?
> --
>
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Posted by Jeff Wisnia on October 11, 2007, 6:09 pm
Steve Barker LT wrote:
show/hide quoted text
> how 'bout quit moving?
>
> s
>
Maybe he can't, because......
"It's time to change partners again!"
Which is a line from the song "Alma" by Tom Lehrer:
http://members.aol.com/quentncree/lehrer/alma.htm
and
http://home.comcast.net/~jwisnia18/temp/Alma.mp3
Jeff
--
Jeffry Wisnia
(W1BSV + Brass Rat '57 EE)
The speed of light is 1.8*10^12 furlongs per fortnight.
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Posted by DanG on October 10, 2007, 9:36 pm
Check the motor nameplate to see if it can be run on 110.
I had a fella give me a old Sears (Simpson, Sears, and Roebuck, as
a matter of fact) compressor mounted on a green horizontal tank,
he said it just made a funny humming noise. It had a black motor
on it, 240 only - not a dual voltage motor. Sure did hum funny on
110. I happened to have a dual voltage motor. I prefer them on
110 because so many places I work don't have 220 handy.
--
______________________________
Keep the whole world singing . . . .
DanG (remove the sevens)
dgriff237@7cox.net
show/hide quoted text
<dan> wrote in message
>I have a Sears air compressor that is 240 and uses a different
>plug.
> It's a PITA because I have to add a new (240) outlet to every
> house I
> move to. Can I simply convert the motor to 110? How difficult is
> this?
> Or do I need to buy a new compressor?
> --
>
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> > I have a Sears air compressor that is 240 and uses a different plug.
> > It's a PITA because I have to add a new (240) outlet to every house I
> > move to. Can I simply convert the motor to 110? How difficult is this?
> > Or do I need to buy a new compressor?
> Tell us the (real) horsepower of the motor or how many amperes it draws
> at 240 vac and lots of guys here will be able to give you a more
> definitive answer.
> My guess is that unless you imported a small compressor from somewhere
> where 220 or 240 is the standard "household voltage" it's probably got
> such a large motor that you'd be hard pressed to run it off a 120 volt
> 20 ampere circuit.
> I said (real) in my first paragraph because more often than not the
> advertised horsepower of air compressors and vacuum cleaners is
> exagerated hype. They use some stupid "peak horsepower" measurement of
> the energy the motor puts out when they apply a load which is large
> enough to cause it to stall.
> Jeff
> --
> Jeffry Wisnia
> (W1BSV + Brass Rat '57 EE)
> The speed of light is 1.8*10^12 furlongs per fortnight.