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, 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.
My apologies for not posting the full specifications on the plate.
They didn't make sense to me then or now. Here goes.
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
AMB -40 deg INS-B3
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.
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.
Don't bother, it's not going to work.
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
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
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.
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.
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.
Never heard of a 120V 3 ph motor. Most 3 PH has three legs of 120V coming in
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.
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
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.
On Sunday, November 2, 2003 at 12:08:05 PM UTC-6, klm wrote:
With all due respect, you can find a 120V 3 phase motor in many Carrier and Payne brand furnace boxes.
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:
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.
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