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How to wire a 12 wire 3 phase motor without the

How do I wire a 12 wire 3 phase motor to hi-voltage (480) when the wires coming from the motor are not labeled.

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You wire it like this:
4 and 7 together
5 and 8 together
6 and 9 together
1 goes to T1
2 goes to T2
3 goes to T3
And if the rotation is wrong, switch any 2 or 1,2,or 3

Now you are going to have to ohm your wires, your lowest ohms of two wires go together. Best thing to do is google delta and ywe transformers...Of course if all else fails take to a motor shop (electric) and they can map it for you.

Posted on Feb 24, 2010

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I just bought a double head notcher with 2-10hp 3 phase motors they were wired 480 volt I only have 230 volt 3 phase from a converter. I put 2 starters to match voltage and motor size.what's the prob.


talk with an electrician but I think that if you have 3 phase motors on 480 volts you will need an inverter that will handle 480 volts
as it stands now you only have 230 volts for 3 phase and that means that there is insufficient power to run the motors
however in cases such as this , a long talk with an electrician could save lots of money

Aug 03, 2015 | Air Tools & Compressors

1 Answer

Wiring schematic for a 1971 Reuland 3 phase # Hp. electric motor for a grinder pump


Its going to depend on whether you are connecting to 240 volt or 440 volts...

It also depends on whether it is a 'wye' wound motor or a 'delta' wound motor.

A nine wire motor is probably a multi-voltage motor capable of running on either 240 or 440 volts. For operation on low voltage, 240 v, the windings must be connected in parallel whereas hi voltage operation makes it necessary to have the windings wired in series.

I will not give the details on the winding connections because the process to determine whether it is a 'delta' or 'wye' wound motor is too involved to derscribe on a forum. But..... if it is a 'wye' wound motor, there will be three additional wire connections 10, 11, and 12, that are wired together and under the end bell and not accessible.

We don't want to 'smoke' your motor, so let the suggestion be to contact a reputable and qualified electrician who you trust to determine what's required and to connect it without the potential for damage.

Nov 24, 2014 | Air Tools & Compressors

1 Answer

I need to wire up a 3 phase compresser motor, 9 wires wired 480, to change to 240 volt hookup. right now it is wired 3 motor wires to each hot, no nameplate or wiring diagram.


Please verify the existing connections to determine if they fit the "High Voltage" configuration listed below. If they do (and they should), the "Low Voltage" configuration below is then correct for 240.

Jaypug

Low voltage ...

L1---1--6--7

L2---2--4--8

L3---3--5--9


High voltage ...

L1---1 4--7

L2---2 5--8

L3---3 6--9

Dec 04, 2013 | Gb Electrical 100 Amp GE Load Center

1 Answer

I need to wire up a baldor 3 phase motor 208-230/480 15hp and dont have the wiring diagram to know what wire is what or where to hook it to?


Hi Casey, I'm an electrician and can help you with this problem.

First, a disclaimer. Without the catalog number of the motor you have, or a wiring diagram for it, no one can tell you how to wire this motor with any certainty. With that said...

Nearly all single speed 3 phase motors have 9 leads (numbered 1 thru 9) and can be wired for either "high" or "low" voltage. Most of the time, high is 480 volts and low is 208/240 volts. Given that you posted the amperage as "41-38 / 19", I am 99% confident that 41 amps is at 208 volts, 38 amps is at 240 volts and 19 amps is 480 volts. Further below is the way to wire unless the motor manufacturer or name plate indicates differently. You will need to determine the voltage of the appliance this is going to be installed into. You should be able to find this on a name plate of the appliance - but it may provide a dual voltage spec here, too. If this is the case, you will need to *carefully* measure the voltage with a meter, or find out the voltage of the electric panel that feeds the appliance.

Once you have learned the incoming voltage, you will connect the motor as such when L1, L2 and L3 are the line voltage supply wires and wires 1 thru 9 match the numbers on the nine wires from the motor.

208/240 or "Low" volts:
Motor leads 4, 5 & 6 connected together and wirenut.
Motor leads 1 & 7 to L1 and wirenut.;
Motor leads 2 & 8 to L2 and and wirenut and lastly,
Motor leads 3 & 9 to L3 and wirenut.

480 or "High" volts:
Motor lead 1 to L1 and wirenut,
Motor lead 2 to L2 and wirenut,
Motor lead 3 to L3 and wirenut,
Motor leads 4 to 7 and wirenut,
Motor leads 5 to 8 and wirenut and lastly,
Motor leads 6 to 9 and wirenut.

The motor should be operated briefly or "jogged" to determine the direction the motor turns. If the motor rotation needs to be changed, simply swap any two "L" wires (swap L1 and L2, or L1 and L3, or L2 and L3). Test once more to verify rotation and when correct close the wiring compartment and complete the installation. Swapping the L wires will likely be much quicker and easier to do at the magnetic contactor instead of the the motor's wiring compartment. Either location is acceptable.

You should try to obtain the name plate data for this motor - if at all possible to to make sure of the voltage and wiring method. I hope this helps & good luck!

May 13, 2012 | Gb Electrical 100 Amp GE Load Center

2 Answers

I need a wiring diagram for the Hobart H600 which has a multi tap motor on and i would like to change the voltage on the motor to 200volt single phase 120/208 or even 120208 3phase. The wiring diagram is...


You cannot wire a three phase motor for single phase and you cannot wire a single phase motor for three phase. If you have a three phase dual voltage motor your options are 220 or 440 volts. If you have a single phase dual voltage motor your options are 120 or 240 volts. A 208 volt Hobart motor will only function correctly on 208 volts and is not dual voltage.

Aug 05, 2010 | Hobart H600 Stand Mixer

1 Answer

Need to rewire from 480 to 240 need coolant pump diagram for colchester # 348337 3 phase motor


Assuming that the motor has 9 leads and the wire numbers are still on the wires, for 240 volt 3 phase connections:

Connect T1, T6, and T7 together with L1 (A phase)

Connect T2, T4, and T8 together with L2 (B phase)

Connect T3, T5, and T9 together with L3 (C phase)

If you're not sure which of the incoming wires from the supply are L1, L2, and L3, just pick one. If the rotation is wrong just swap any 2 (TWO) phase wires.

Jun 22, 2010 | Measuring Tools & Sensors

1 Answer

Trying to wire up a single phase transfomer, 480 step down to 208


TAKE ONE OF YOUR 480VOLT WIRES AND TIE IT WITH (H1) TAKE THE OTHER 480VOLT WIRE AND TIE IT TO (H4) NEXT TAKE TRANSFORMER WIRES (H2) &(H3) AND TIE THEM TOGETHER THAT WILL TAKE CARE OF THE HIGH VOLTAGE SIDE, NEXT WITH YOUR 208V- TAKE ONE OF THEM AND TIE IT TO (X1) TAKE THE LAST ONE AND TIE IT TO (X4). LAST TIE (X2) AND (X3) TOGETHER THEN YOU WILL HAVE IT. -LANCE

Oct 16, 2009 | Acme 1000-Watt Transformer with Dual...

1 Answer

How to wire a 3 phace 5 hp baldor motor


the neutral or white is not used. if the fourth wire is a ground then it goes to the motor frame. if it is a dual voltage motor then here is the wiring: for 240 volt 3 phase connect 4-5-6 together and tape, 3-9 goes on L1, 2-8 together goes on L2, 1-7 together goes on L3. To reverse direction swap any two line wires. For 480 volts 3 phase: L1 goes on T1, L2 goes on T2, L3 goes on T3. Connect together T6-T9 and tape, connect T5-T8 and tape, connect T4-T7 and tape. again to reverse direction swap two line wires.

Oct 14, 2009 | Baldor 115v,1ph, 3,600rpm 7" 1/2hpbnch...

1 Answer

I have an A.O. Smith f48l47a50 blower motor, and I need help with wiring. First it's a 460v,1phase,1/2hp,975rpm,3spd motor. My question with the wiring is do I need to supply a wire for line power? I know...


are you SURE its 460volt single phase??? that voltage is normally a 3phase motor voltage,and color of wires is right for 480/277, but that would be 3 phase.....not saying your wrong,just make sure

Jul 29, 2009 | Heating & Cooling

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