Motor 120V 3-Phase
klm
From the Specs plate it looks like a 120Vac 3 phase motor. Is there
such an animal? How do I wire one up wth the regular household plug?
Charlie Bress
Charlie
"klm" <kl...@shaw.ca> wrote in message
news:lalaqvo9gjn992hdm...@4ax.com...
Wade Lippman
> From the Specs plate it looks like a 120Vac 3 phase motor. Is there
> such an animal? How do I wire one up wth the regular household plug?
First you would have to get 3 phase, which you probably can't. Then you
would have to get some transformers to reduce it to 120v, and you probably
can't do that either.
Then, just plug it in!
Carolyn Marenger
There is such an animal. Used them in industrial greenhouses, they were
more reliable than single phase during brown outs and the like.
How to wire it up to your home? If you don't have three phases pumped
into your house (and I don't know of anyone who does) then you don't. In
theory you could wire up one phase, leave the other two phases out of the
equation. It will work, but will probably burn out over time.
Suggestion: Go find a single phase 120Vac motor for $5 at another garage
sale. Or check out people tossing old washers & dryers. The motors are
often just fine in those beasts.
Carolyn
j j
"Wade Lippman" <tol...@frontiernetnospam.net> wrote in message
news:Owdpb.11570$Jx5....@news02.roc.ny...
he can't get 3 phases to a residential area because the netwqork itself only
brings one phase to an area, then splits it into 2 phases with a center-tap
transformer.
but why would he need a transformer to bring it down to 120V? we get 120V
per phase in Canada.
Tony Hwang
j j wrote:
Hi,
Because 3 Phase is only available in higher voltage.
Tony
>
j j
> From the Specs plate it looks like a 120Vac 3 phase motor. Is there
> such an animal?
possibly. but I don't see how you'd use them in a residential area.
>How do I wire one up wth the regular household plug?
you can't since you only get 2 phases in a house and a 3 phase motor needs 3
phases.
j j
"Carolyn Marenger" <caroly...@softhome.net> wrote in message
news:pan.2003.11.02....@softhome.net...
> How to wire it up to your home? If you don't have three phases pumped
> into your house (and I don't know of anyone who does) then you don't. In
> theory you could wire up one phase, leave the other two phases out of the
> equation. It will work, but will probably burn out over time.
it won't work if it's an induction motor.
Randd01
or in some cases one leg has 220V called Delta ph. In any case there are
converters out there that work but cost way more then $5.
Wade Lippman
> he can't get 3 phases to a residential area because the netwqork itself
only
> brings one phase to an area, then splits it into 2 phases with a
center-tap
> transformer.
>
Greg O
> From the Specs plate it looks like a 120Vac 3 phase motor. Is there
> such an animal? How do I wire one up wth the regular household plug?
Go buy a $500 Variable Frequency Drive. Most will accept single phase in and
will produce a three phase output. Set the parameters for 120 volt motor and
you are set!
Either that or sell it for $5 on a garage sale and buy a motor that you can
use!
Greg
j j
"Tony Hwang" <drag...@shaw.ca> wrote in message
news:9_dpb.261529$pl3.222127@pd7tw3no...
oh, right, I thought he meant he would need a transformer to bring the
normal residential line to 120 V (since residential areas don't get
industrial voltages, using a transformer didn't make sense to me)
j j
you get 2 120V phases into your house, and since they are 180 degrees out of
phase, you can combine them to get a 240V phase, but at the entrance to your
house you get 2 distinct 120V phases.
CBHvac
"j j" <j...@jj.com> wrote in message
news:gPdpb.849$Pg1....@news20.bellglobal.com...
>
> "Wade Lippman" <tol...@frontiernetnospam.net> wrote in message
> news:Owdpb.11570$Jx5....@news02.roc.ny...
> >
> > "klm" <kl...@shaw.ca> wrote in message
> > news:lalaqvo9gjn992hdm...@4ax.com...
> > > I bought for $5 an almost new looking 1 hp motor from a garage sale.
> > > From the Specs plate it looks like a 120Vac 3 phase motor. Is there
> > > such an animal? How do I wire one up wth the regular household plug?
> >
> > First you would have to get 3 phase, which you probably can't. Then you
> > would have to get some transformers to reduce it to 120v, and you
probably
> > can't do that either.
>
> he can't get 3 phases to a residential area because the netwqork itself
only
> brings one phase to an area, then splits it into 2 phases with a
center-tap
> transformer.
You really need to inform California Edison of that then...since they have
several like that in Indio, for starters..
HA HA Budys Here
>you get 2 120V phases into your house, and since they are 180 degrees out of
>phase, you can combine them to get a 240V phase, but at the entrance to your
>house you get 2 distinct 120V phases.
No, you don't.
HA HA Budys Here
>Date: 11/2/2003 3:30 PM Eastern Standard Time
>Message-id: <gPdpb.849$Pg1....@news20.bellglobal.com>
>
>
>"Wade Lippman" <tol...@frontiernetnospam.net> wrote in message
>news:Owdpb.11570$Jx5....@news02.roc.ny...
>>
>> "klm" <kl...@shaw.ca> wrote in message
>> news:lalaqvo9gjn992hdm...@4ax.com...
>> > I bought for $5 an almost new looking 1 hp motor from a garage sale.
>> > From the Specs plate it looks like a 120Vac 3 phase motor. Is there
>> > such an animal? How do I wire one up wth the regular household plug?
>>
>> First you would have to get 3 phase, which you probably can't.
Maybe with a phase generator.
> Then you
>> would have to get some transformers to reduce it to 120v, and you probably
>> can't do that either.
>
>he can't get 3 phases to a residential area because the netwqork itself only
>brings one phase to an area, then splits it into 2 phases with a center-tap
>transformer.
No, it splits the primary phase into 2 low voltage "legs."
(Is a 12v-18v-24 volt transformer a 3-phase output?)
Tom Horne
> brings one phase to an area, then splits it into 2 phases with a center-tap
> transformer.
>
> but why would he need a transformer to bring it down to 120V? we get 120V
> per phase in Canada.
If the motor in question is really 120 volt then it isn't three phase.
The phase to phase voltage of three phase power that will provide 120
volts relative to the center tap of a wye connected transformer set is
208 volts. I've been doing electrical work in heavy industrial to home
environments for over thirty years and I have never seen a 120 volt
three phase motor. 120 volt service is pretty much a north american
thing. I have worked a lot of places and I have never encountered a
three phase voltage that was 120 volts when measured phase to phase.
--
Tom H
Tom Horne
>> he can't get 3 phases to a residential area because the netwqork itself only
>> brings one phase to an area, then splits it into 2 phases with a center-tap
>> transformer.
>>
>> but why would he need a transformer to bring it down to 120V? we get 120V
>> per phase in Canada.
>
> Hi,
> Because 3 Phase is only available in higher voltage.
> Tony
Tony
That may be true were you are but it is untrue in many places. Many
utilities will provide 208/120 volt wye connected three phase service.
It is an especially common service to large apartment houses. Since the
US NEC forbids luminaires that require voltage over 150 in dwellings the
480/277 volt three phase service is of little use in such buildings.
--
Tom
Tom Horne
> he can't get 3 phases to a residential area because the netwqork itself only
> brings one phase to an area, then splits it into 2 phases with a center-tap
> transformer.
>
> but why would he need a transformer to bring it down to 120V? we get 120V
> per phase in Canada.
On the street in back of mine there are three 13.9 kilovolt lines on the
top cross arm of the poles. Every third transformer is tapped off of
the same phase. That is undoubtedly because the area has some apartment
houses but the point is that the network often brings all three phases
to a residential or even a rural area in order to balance the load on
the supply. PEPCO, Allegheny, and VEPCO all provide three phase service
to much of their service area. They will not supply a three phase
transformer setup to supply a service unless the demand justifies the
expense. If the demand expected on that service will not justify the
expense some power companies will supply three phase distribution
voltage as the service to a customer owned transformer.
--
Tom
j j
"HA HA Budys Here" <hahabu...@aol.com> wrote in message
news:20031102184734...@mb-m24.aol.com...
really....
what do you get then, oh great HA HA?
3 wires come in the house from the utility, what are they?
j j
"CBHvac" <webm...@carolinabreezehvac.com> wrote in message
news:bofpb.218$X5.1...@eagle.america.net...
> You really need to inform California Edison of that then...since they have
> several like that in Indio, for starters..
you get 3 phase power in a residential unit?
j j
> >he can't get 3 phases to a residential area because the netwqork itself
only
> >brings one phase to an area, then splits it into 2 phases with a
center-tap
> >transformer.
>
> No, it splits the primary phase into 2 low voltage "legs."
>
> (Is a 12v-18v-24 volt transformer a 3-phase output?)
do you get all 3 voltages at the same time, and out of phase?
Tom Horne
I can take a buck boost transformer that has four taps on the secondary
and ground one of those taps. I will have three different voltages
relative to the grounded tap. Is it your position that I know have a
three phase transformer?
Why does a 240 volt motor that is connected to a center tapped 120/240
volt seccondary need a capacitor to make it turn?
--
Tom H
HA HA Budys Here
>Date: 11/2/2003 8:56 PM Eastern Standard Time
>Message-id: <5Bipb.3700$fg4....@news20.bellglobal.com>
I'll tell ya.
The 2 "phases" as you call them are not phases at all. Each is derived from the
same primary phase. There is however, relative to their reference to neutral,
240v difference between them.
secondary primary
windings windings
(1)----------)
(
)
(
(n)----------)
(
(*) )
(
(2)----------)
You know between either 1 or 2 and N you get 120v, and between 1 & 2 you get
240. Now add a tap at the (*) and say that's 60v to (n) - it would also be 60v
from * to (2) and 180v between * and (1).
Now, would this be a 3-phase transformer? No, and that's why these kinds of
services are called single phase 120/240.
Tony Hwang
Tom Horne wrote:
Hi, Tom
There you go. 208/120. Because you have 208, 120 is byproduct.
Wye or Star no 120 without 208. Actually 120(Edison) system is inferior
to 208 or 220.
Tony
Tony
>
volts500
"Tom Horne" <hor...@mindspring.com> wrote in message
news:12ipb.2998$Oo4...@newsread1.news.atl.earthlink.net...
Tom, I've been doing electrical work in "heavy industrial to home
environments" for 27 years, and I've never seen a 120 volt 3 phase motor
either, nor a 3 phase 120 volt (line-to-line) system..............but if you
look at NEC (2002) Table 430.150 it does indeed show FLC's for 115 volt 3
phase motors 2 HP and under.........so, evidently, they must exist somewhere
for some special purpose. Also see the commentary at the beginning of
Article 647 in the NEC Handbook........evidently the motion picture and tv
production industry (NEC Article 530) has been using a 60/120 volt 6 phase
wye connected system for some time, for noise reduction when they set up to
shoot in "dirty" electrical environments. It's being referenced as
"balanced power" or "technical power." Seems the 2002 NEC (new) Article 647
is now permitting these systems for just about any sentitive electronic
equipment requiring isolation.........computers, medical equipment, etc.
Wade Lippman
Follow the link. Can't be much clear than that.
>
>
CBHvac
One of my old customers there sure as hell did.
We went to replace his old AC unit, and be damned if he didnt have 3 phase
hitting the board....
Turns out, that everyone on his block was like that...and it was
residential.
>
>
Tony Hwang
Hi,
Alas! Now they're talking about BPL!
Tony
Dean Hoffman
x3kpb.90484$RP2....@twister.tampabay.rr.com, "volts500"
<volt...@tampabay.rr.com> wrote:
> Tom, I've been doing electrical work in "heavy industrial to home
> environments" for 27 years, and I've never seen a 120 volt 3 phase motor
> either, nor a 3 phase 120 volt (line-to-line) system..............but if you
> look at NEC (2002) Table 430.150 it does indeed show FLC's for 115 volt 3
> phase motors 2 HP and under.........so, evidently, they must exist somewhere
> for some special purpose. Also see the commentary at the beginning of
> Article 647 in the NEC Handbook........evidently the motion picture and tv
> production industry (NEC Article 530) has been using a 60/120 volt 6 phase
> wye connected system for some time, for noise reduction when they set up to
> shoot in "dirty" electrical environments. It's being referenced as
> "balanced power" or "technical power." Seems the 2002 NEC (new) Article 647
> is now permitting these systems for just about any sentitive electronic
> equipment requiring isolation.........computers, medical equipment, etc.
Would it be practical for the original poster to use a static phase
converter for this motor? Maybe he'd be better off to just buy a regular
single phase 1 hp motor money wise.
Dean
-----= Posted via Newsfeeds.Com, Uncensored Usenet News =-----
http://www.newsfeeds.com - The #1 Newsgroup Service in the World!
-----== Over 100,000 Newsgroups - 19 Different Servers! =-----
j j
> j...@jj.com Wrote:
>
> > he can't get 3 phases to a residential area because the netwqork itself
only
> > brings one phase to an area, then splits it into 2 phases with a
center-tap
> > transformer.
> >
> > but why would he need a transformer to bring it down to 120V? we get
120V
> > per phase in Canada.
>
> On the street in back of mine there are three 13.9 kilovolt lines on the
> top cross arm of the poles. Every third transformer is tapped off of
> the same phase.
well, then I guess every network is different. Where I live, I'm pretty sure
we don't get 3 phases (I have no idea how it is in a building, I live on a
street with houses only). On my street there's no transformer, the phases
get split somewhere else.
j j
> > "HA HA Budys Here" <hahabu...@aol.com> wrote in message
> > news:20031102184647...@mb-m24.aol.com...
> >
> >
> >>>> >he can't get 3 phases to a residential area because the netwqork
itself
> >
> > only
> >
> >>>> >brings one phase to an area, then splits it into 2 phases with a
> >
> > center-tap
> >
> >>>> >transformer.
> >>
> >>>
> >>> No, it splits the primary phase into 2 low voltage "legs."
> >>>
> >>> (Is a 12v-18v-24 volt transformer a 3-phase output?)
> >
> >
> > do you get all 3 voltages at the same time, and out of phase?
> >
> >
>
> I can take a buck boost transformer that has four taps on the secondary
> and ground one of those taps. I will have three different voltages
> relative to the grounded tap. Is it your position that I know have a
> three phase transformer?
again, are these voltages out of phase? if not, no you don't have different
phases, but if the voltages are not in phase, then they're different phases.
the 2 120V lines most people get in their residential units are 180 degres
out of phase, which is why together they can make 240V.
> Why does a 240 volt motor that is connected to a center tapped 120/240
> volt seccondary need a capacitor to make it turn?
because them otor is being fed a single 240V phase and it needs at least 2
phases to run, the capacitor gives a 90 degree phase shift.
volts500
No, Tony, only an electronics "wizahd" like you would confuse BPL with
"clean" 120 volt power. Wouldn't surprise me if you told the OP to wire the
motor up with some Cat5.
Tony Hwang
Hi,
When clean power is mentioned BPL came to my mind.
Tony
>
volts500
"Dean Hoffman" <dh0...@ineINbrasVALkaID.com> wrote in message
news:BBCB2FD2.42A2D%dh0...@ineINbrasVALkaID.com...
> Would it be practical for the original poster to use a static phase
> converter for this motor? Maybe he'd be better off to just buy a regular
> single phase 1 hp motor money wise.
>
> Dean
I think the OP has a $5 boat anchor. Have you ever seen a converter with a
120 volt output?
Tom Horne
>>I can take a buck boost transformer that has four taps on the secondary
>>> and ground one of those taps. I will have three different voltages
>>> relative to the grounded tap. Is it your position that I know have a
>>> three phase transformer?
>
>
> again, are these voltages out of phase? if not, no you don't have different
> phases, but if the voltages are not in phase, then they're different phases.
> the 2 120V lines most people get in their residential units are 180 degres
> out of phase, which is why together they can make 240V.
>
>
>>> Why does a 240 volt motor that is connected to a center tapped 120/240
>>> volt seccondary need a capacitor to make it turn?
>
>
> because them motor is being fed a single 240V phase and it needs at least 2
> phases to run, the capacitor gives a 90 degree phase shift.
>
>
Make up my mind! Either the two conductors that supply the 240 are a
single phase or they are two phases. There is no difference between my
buck boost transformer and the utilities center tapped single winding
secondary service transformer except for the number of taps. They both
have a primary that is connected to one grounded conductor (the Multi
Grounded Neutral [MGN] in the case of the utility transformer) and a
single conductor that has a voltage relative to the grounded conductor.
They both have points on the single secondary winding that are tapped
so that different voltages can be supplied from the same transformer.
If the utility transformer is two phase why isn't my multi voltage
secondary with three voltages relative to the grounded tap three phase?
--
Tom
TURTLE
"klm" <kl...@shaw.ca> wrote in message
news:lalaqvo9gjn992hdm...@4ax.com...
> I bought for $5 an almost new looking 1 hp motor from a garage sale.
> From the Specs plate it looks like a 120Vac 3 phase motor. Is there
> such an animal? How do I wire one up wth the regular household plug?
this is turtle.
I have a 480 volt Step down transformer to 120 volts that you could try to
fix to do something or someway to do something for your 120 volt 3 phase 1
horse motor. I don't know how you could wire it up but it's cheap and i only
want $2.00 for it because it has $2.00 worth of copper in it. Now you only
need 3 phase 480 volt service to your home and you have it here. I kept it
for it has a tap off the side for 480 volt 3 phase to go to rooftop
condenser fan motors of 230 volt 3 phase fan motors which 4 will run off it.
I don't know what the 120 volt 3 phase taps is doing on it.
Hurry up it's going fast for I have only had it 5 years now and looking for
a home. Awwwwwwwwwwww E-Bay they can find a home for anything.
TURTLE
j j
> Make up my mind! Either the two conductors that supply the 240 are a
> single phase or they are two phases.
if you take a 3-phase 120V/phase Wye connection, line to line you get 208V
Are the 3 phases separate or the same phase?
If you take the line to line voltage, (using one phase as the neutral) do
you get another phase of 208V or is it the same phase?
I dunno, by the basic definition of "phase", since the 2 120V lines in the
house are 180 degrees out of phase, they are different phases. If they're
not in phase, they can't be the same phase...
TURTLE
This is turtle.
You have them somewhere but maybe you have transformer bank /
Mini-Substation on the ground some where to feed the hold area.
TURTLE
Dean Hoffman
"j j" <j...@jj.com> wrote:
>
> "Tom Horne" <hor...@mindspring.com> wrote in message
> news:60jpb.3068$Oo4...@newsread1.news.atl.earthlink.net...
TH:
>>
>> I can take a buck boost transformer that has four taps on the secondary
>> and ground one of those taps. I will have three different voltages
>> relative to the grounded tap. Is it your position that I know have a
>> three phase transformer?
JJ:
>
> again, are these voltages out of phase? if not, no you don't have different
> phases, but if the voltages are not in phase, then they're different phases.
> the 2 120V lines most people get in their residential units are 180 degres
> out of phase, which is why together they can make 240V.
TH:
>
>> Why does a 240 volt motor that is connected to a center tapped 120/240
>> volt seccondary need a capacitor to make it turn?
JJ:
>
> because them otor is being fed a single 240V phase and it needs at least 2
> phases to run, the capacitor gives a 90 degree phase shift.
JJ, look at it this way. Your second statement is true. I'm not sure
about the amount of degree shift. That means the first one can't be since
the 240 volt motor would run fine without a capacitor off residential
power. The residential power would supply the phase shift to start the
motor without the capacitor.
Power companies supply either single phase or three phase in my area.
This is in a rural area so the wires and transformers are up on power poles.
Three phase has 3 wires plus ground. Single phase has one wire plus ground.
The supply to the farm yards is generally single phase 240/120. This is a
really crude diagram of a transformer for the single phase 240/120 power.
The top line is the utility's primary high voltage connection.
7200VAC??------------------------------------------- Ground.
120----G----120
The bottom line is the consumer's supply
secondary winding. Three wires. Two "hots" and the "neutral". This is a
single winding but it has a tap in the middle to provide the 120 voltage
line to neutral. There would be only 240 single phase without the center
tap. The secondary would be something like this:
240----------G
Two wires, single phase just like the power company's supply voltage.
I did not include the equipment grounding conductor in either of the
secondaries.
The power company's supply voltage to the transformer is single phase so
the 120/240 to the consumer has to be single phase. There is nothing in the
transformer to create a time/degree shift.
klm
<dh0...@ineINbrasVALkaID.com> wrote:
>
> Would it be practical for the original poster to use a static phase
>converter for this motor? Maybe he'd be better off to just buy a regular
>single phase 1 hp motor money wise.
>
> Dean
>
My apologies for not posting the full specifications on the plate.
They didn't make sense to me then or now. Here goes.
MARATHON ELECTRIC
Wausau, Wisconsin 54401
Cat No. K049 Model 6V556T17D2130D P
FR 56 PH-3 Type TS
(Left Hand Column) ( RH Column)
FLA 1.4 Hz 60
SF 1.15 HP 1
SFA 1.6 RPM 1725
CODE L VOLT 575
Single Voltage L1 L2 L3
T1 T2 T3
(wiring diagram)
FR 56
AMB -40 deg INS-B3
DUTY- Cont.
DES B
Looks like I goofed on the voltage (575V) but does such a voltage
exist in a 3 phase industrial power source?
The motor has its own attached control box with an ordinary toggle
switch hooked with three conductor 16 ga rubber insulated cord, but
no power plug connector. It doesn't look right for a 575V system but
there it is.
I have already wired an ordinary three prong household plug to the
cord but I have not stuck that into any outlet yet to test it. That
575V spec gave me reason to ask first. That was sometime ago until I
thought about asking this newsgroup.
A new 1 hp motor costs >$200. $5 for one at a garage sale is a safe
bet and if it doesn't work its no loss. And darn, there is not a
scratch on it from power on usage so its practically new.
j j
"Dean Hoffman" <dh0...@ineINbrasVALkaID.com> wrote in message
> JJ:
> >
> > because them otor is being fed a single 240V phase and it needs at least
2
> > phases to run, the capacitor gives a 90 degree phase shift.
>
> JJ, look at it this way. Your second statement is true. I'm not sure
> about the amount of degree shift. That means the first one can't be since
> the 240 volt motor would run fine without a capacitor off residential
> power. The residential power would supply the phase shift to start the
> motor without the capacitor.
actually when I was asked that question, I thought about why a motor
wouldn't work with the 2 phases in the house: since the phases are exactly
180 degrees out of phase, the resulting magnetic field in the motor just
pulsates, it doesn't rotate, and it's not enough to make the motor turn (at
least in an induction motor). a single phase induction motor will need a
capacitor to start because the capacitor gives it a 90 degreep hase shift,
and the resulting magnetic field will rotate.
> The power company's supply voltage to the transformer is single phase
so
> the 120/240 to the consumer has to be single phase. There is nothing in
the
> transformer to create a time/degree shift.
but aren't the two hot wires out of phase by 180 degrees? (when one is at
positive peak, the other is at negative peak)
HA HA Budys Here
>Date: 11/3/2003 6:59 PM Eastern Standard Time
>Message-id: <pZBpb.4511$fg4.1...@news20.bellglobal.com>
You have to change the way you define "phase" for yourself.
A phase, or multiple phases, are segments of a circle.
Multiple voltages, or "legs" derived from a single source, (only 1 phase
segment,) are multiple "taps" or "legs," not each an individual phase.
This is why you'll see most 3-phase equpiment labled A-B-C or Phase A - Phase B
- phase C , and most 240v volt equipment, especially residential, labled "L1 &
L2" meaning, leg (or line) 1 and leg 2.
Tony Hwang
Hi,
If he can see it as 220V winding with center tap.(Edison circuit).
No phase involved here.
Tony
>
>
>
>
volts500
Yes, usually in Canada.
> The motor has its own attached control box with an ordinary toggle
> switch hooked with three conductor 16 ga rubber insulated cord, but
> no power plug connector. It doesn't look right for a 575V system but
> there it is.
Sure it is. The FLA (Full Load Amps) is only 1.4 amps. 1.4 amps x 125% =
1.75 amps The 16 gauge wire is sufficient for 1.75 amps, as long as the
wire is rated for 600 volts.
> I have already wired an ordinary three prong household plug to the
> cord but I have not stuck that into any outlet yet to test it. That
> 575V spec gave me reason to ask first.
Don't bother, it's not going to work.
>That was sometime ago until I
> thought about asking this newsgroup.
>
> A new 1 hp motor costs >$200. $5 for one at a garage sale is a safe
> bet and if it doesn't work its no loss. And darn, there is not a
> scratch on it from power on usage so its practically new.
Sorry, but you still have a $5 boat anchor. You may be able to find a 575
volt 3 phase converter, but if you can, I suspect that it will cost as much
as a new 1 HP (120 volt or 240 volt single-phase) motor. Keep trying, you
should be able to find a used motor out there..........except this time
don't buy it unless it is a 120 volt or 240 volt _single-phase_(PH-1) 1 HP
motor.
j j
> cord but I have not stuck that into any outlet yet to test it. That
> 575V spec gave me reason to ask first. That was sometime ago until I
> thought about asking this newsgroup.
the problem is the lack of 3 phase power, not the voltage itself...
how did you connect it to an ordinary house plug? an ordinary 3-prong house
plug has 1 ground, 1 neutral and one hot. you need at least 3 hots for this
motor...
Dean Hoffman
"j j" <j...@jj.com> wrote:
>
> "Dean Hoffman" <dh0...@ineINbrasVALkaID.com> wrote in message
> news:BBCC367F.42B81%dh0...@ineINbrasVALkaID.com...
>> The power company's supply voltage to the transformer is single phase
> so
>> the 120/240 to the consumer has to be single phase. There is nothing in
> the
>> transformer to create a time/degree shift.
>
> but aren't the two hot wires out of phase by 180 degrees? (when one is at
> positive peak, the other is at negative peak)
No. What you actually have is 240 volts single phase. It's the tap
in the center that gives you the 2 120 volt hot legs. That tap could be
moved to change the output to, say, one line at 216 volts and the second
line at 24 volts. The total voltage would still be 240. The transformer is
just taking 7200 volts single phase and cutting it down to 240 single phase.
Here are a couple links that might help. There are 2 or 3 pages at the
first one. There's a next button way at the bottom to change pages.
http://www.tpub.com/neets/book5/17a.htm
The second one is an old military training manual. There are some
explanations for generators and transformers.
http://www.adtdl.army.mil/cgi-bin/atdl.dll/fm/55-509-1/toc.htm
As someone mentioned the degrees out of phase refers to the rotation of
the generator making the power. One phase would be X degrees out of phase
with another. That's not possible if only one of the power company's lines
is being used. Look at the differences between a single phase generator and
a three phase generator at those links.
j j
"Dean Hoffman" <dh0...@ineINbrasVALkaID.com> wrote in message
> > but aren't the two hot wires out of phase by 180 degrees? (when one is
at
> > positive peak, the other is at negative peak)
>
>
> No. What you actually have is 240 volts single phase. It's the
tap
> in the center that gives you the 2 120 volt hot legs. That tap could be
> moved to change the output to, say, one line at 216 volts and the second
> line at 24 volts. The total voltage would still be 240. The transformer
is
> just taking 7200 volts single phase and cutting it down to 240 single
phase.
look, I know this already.
you have 3 wires, one neutral (the reference) and two phases or legs or
whatever you want to call them.
take an oscilloscope and measure the two voltages taken with respect to the
neutral. Are the two sinusoidal signals in phase or out of phase by 180?
volts500
> take an oscilloscope and measure the two voltages taken with respect to
the
> neutral. Are the two sinusoidal signals in phase or out of phase by 180?
They are "in-phase", only the _polarity_ has changed. Do they cross the
zero line at the same time? Do they peak at the same time? You're
referencing the _same_ waveform with respect to polarity _only_. How can a
single waveform be "out-of-phase" with itself?
HA HA Budys Here
You can lead a horse to water, but you, JJ, will probably die from dehydration.
The almighty HaHa has spoken.
Tony Hwang
HA HA Budys Here wrote:
Hi,
JJ is funny guy for sure. Don't think he really has practical
experience. like climbing poles or wiring up transformers, hooking up
motors, power distribution, etc.
Tony
j j
"volts500" <volt...@tampabay.rr.com> wrote in message
news:K1Ppb.157875$ox6.2...@twister.tampabay.rr.com...
>
> "j j" <j...@jj.com> wrote in message
> news:prGpb.4613$fg4.1...@news20.bellglobal.com...
>
> > take an oscilloscope and measure the two voltages taken with respect to
> the
> > neutral. Are the two sinusoidal signals in phase or out of phase by 180?
>
>
> They are "in-phase", only the _polarity_ has changed.
well, I don't know what your definition of phase is.
where I live, the two waveforms are out of phase by 180.
in a shorted transmission line, for example, the reflecting wave is out of
phase by 180 while in an open transmission line, the reflection is in phase.
I didn't hear anyone say that the reflection in a shorted TL is in phase,
but reversed polarity.
Do they cross the
> zero line at the same time? Do they peak at the same time? You're
> referencing the _same_ waveform with respect to polarity _only_. How can
a
> single waveform be "out-of-phase" with itself?
but there's 2 waveforms. I get 2 hot wires, and the waveform is not in
phase.
take a generator with 4 (separate) poles. the 4 waveforms are out of phase
by 90, so the third is out of phase by 180 with respect to the first, and
the fourth with respect to the second.
same goes for any even fraction of PI.
HA HA Budys Here
That's all fine and good. One doesn't need hands-on experience in power
distribution to comprehend, or rather in this case, *accept* that there's a
difference between a "phase" and a "leg", or that you don't have 2 "phases" in
a home just because you've been calling the legs phases for years.
Many electricians, even utility workers will use the term phase when making a
distinction between the 2 legs of a single-phase 240v service. The trouble
starts when one tries to apply practical electrical theory to this misnomer.
hawthorn...@gmail.com
Taxed and Spent
> It's a railway motor.. 110 volt 3 phase.. Railway is exempt from the NEC code.. Source from a 110volt 3 phase generator.
>
bob haller
Taxed and Spent
Bob F
generally when the (re)poster gives no such info.
Tony944
wrote in message
news:92df533e-3730-4203...@googlegroups.com...
keit...@gmail.com
> I bought for $5 an almost new looking 1 hp motor from a garage sale.
> From the Specs plate it looks like a 120Vac 3 phase motor. Is there
> such an animal? How do I wire one up wth the regular household plug?
The fan blower motor is 120v ECM, electronically commutated motor, which is a 3-phase motor with an attached speed controller. These were originally built by GE. GE then sold off the motor design.
The motor model number is:
5SME39SL0122 or
5SME39SL0310 or
HD52AE120
Remove the rear section of the motor, retained by two screws, then disconnect the 3-wire connector between the motor and the speed controller.
This leaves the front section of the motor, which is a 1HP 3-phase 120v motor
Connect a Reliance Electric SP500 VFD model 1SU11001 (120VAC input, single or 3-phase), 120VAC output 3-phase.
Connect a regular grounded line cord to the RS inputs (black and white), green to the grounding screw, and the motor's 3 wires connect to the RST output terminals.
Plug in the controller, let it run its self-test, then press start. The motor will immediate spin up. Press stop, then Reverse, then Start. The motor will follow, and reverse rotation
Pressing the up or down buttons will vary the motor speed up to about 1800RPM.
You can provide a 5k pot for speed variable, or use 0-10VDC speed control, or 0-20ma speed control.
Long and short of it, the variable speed fan blower motors in the Carrier and Payne (high efficiency) furnace units are 3-phase... just remove the rear speed control section that comes on the motors.
These motors run around $800 retail, new, yes, horrendous, but find a replaced unit and grab the blower motor.
The furnace inducer is also variable speed, 1/5hp, and the outdoor compressor fan unit contains a variable speed 1/3 hp 3-phase motor, both having similar speed controls on rear end.
The outdoor fan is 240v, however, and the inducer fan motor is 120v 3-phase.
