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Anonymous Posted on Jun 12, 2014
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How do I reverse a three phase electric motor?

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Realpowerman

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  • Posted on Nov 26, 2014
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Reversing rotation of 3 phase motors:
CAUTION: Before attempting any repair of electrical equipment verify the power is disconnected to the device.
CAUTION: Three phase motors could potentially be controlled by frequency control systems. It is recommended a trained electrician perform repairs to any electrical system. In particular, consult a trained electrician if the system includes a frequency control system.

Most 3 phase motors can reverse rotation simply by swapping any 2 of the 3 phase wires. A typical 3 phase wiring circuit will include a safety ground wire (usually green) and 3 phase wires, often designated A/B/C, or 1/2/3, or color coded to distinguish each. By swapping the terminal connection of any 2 of the three phase wires, for example, 1 & 2 or 2 & 3 or 1 & 3, but leaving the third phase wire unchanged will reverse the rotation of most motors.

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0helpful
1answer

NEED TO KNOW HOW TO REVERSE DIRECTION OF 1/3 HORSE CENTURY 115 VOLT MOTOR
Has someone torn it apart to rebuild it? This motor is wired to only run one direction.
With three phase electrical like large commercial applications you can change direction by altering the electrical hookup but not on a 115v unless there is much deeper issues internally.
Read full answer
Aug 25, 2016 • Pool & Spa
tip

How to Reverse the Rotation of Single Phase Capacitor-Start Electric Motors
Reversing the rotation of electric motors can be done easily with 3-phase motors. This can be easily achieved by swapping the connection of any two motor leads. But 3-phase motors are usually found and used for industrial purposes. The ones found and used in our homes, from water pumps to electric fans, are single phase capacitor-start type motors. Unlike 3-phase motors, reversing the rotation of single phase electric motors is no easy task. Swapping any two motor leads will not result in the reversal of the motor rotation. Analysis of the motor windings and connections are necessary before any modification can be done to achieve the desired result. Let's take a 3-speed single phase capacitor-start electric motor with electrical diagram shown below as an example. Make sure the motor is disconnected from the power supply before attempting to follow this tip. This tip is intended only for individuals with electrical knowledge, necessary tools, and understand the risks associated with handling electrical equipments and devices.

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The first step in the process is determining the start winding which is connected to the line (AC white) and to one side of the start capacitor. To accurately determine the start winding, disconnect all motor leads from the start capacitor and the speed switch for multi-speed motors and then setting your ohmmeter to the lowest scale (R x 1), measure the resistances between the AC white line and each of the motor leads connecting to the start capacitor. The one with the least resistance is the starting winding lead.

Once the start winding lead going to the capacitor is determined, reconnect the capacitor then connect the black AC line to the found start winding lead (marked X). Connect the white AC line to L of speed switch, the motor lead formerly connected to AC white to 3, red to 2, and white to 1 as shown below. Leave the green/yellow ground wire connection as is.

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Below are the wiring modifications for 2-speed and single speed single phase capacitor-start electric motors.

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on Jan 11, 2011 • Dryers
0helpful
2answers

I have Hobart D300 mixer which operates at 220V, 3phase supply and whereas the facility has 208V, single phase supply. Is there any recommended phase converters available for this product. Thanks
Hi Bill
I may be wrong here......
But I've been around Electricity for a long time.
Have Never seen a device that does phase conversion.
A Building site or home will either have Three Phase or Single Phase Power Available
BUT...A portable (Hired) generator could be "three phase" and you could use any one of those phases individually or all three phases.

I have 3 Phase supply to my house!
But I use 230 volt Single Phase for appliances.
My Bore Pump uses a 3 Phase Motor,
(so with a voltmeter it would read about 440 vAC to the pump motor).
Some Further Info:
A GENERATOR is basically a motor used the opposite way. Rotate a motor and it Generates.
The Phases refer to the THREE Windings in the supplying generator in your suburb.
A Large Magnet passes each winding in sequence giving you the three ripples in the supply.
Our houses can choose to have 1 Phase or Three Phases from the street when you set up your electric supply.
So... to confirm, look at the wires on the supply poles to the premises. Usually three in our area (Oz)
Most people are not aware that a car Alternator is actually three phase. The Rotor is the magnet that rotates.
The only difference with an Alternator is that each "Phase" is connected to 2 Diodes (6 total) to convert the three phase to DC to charge the vehicle.
The Regulator controls the voltage to the Rotor, thereby controlling the output.
So.... An Alternator could in theory supply 3 Phase in a mobile generator. Custom Made. Constant speed would determine the frequency of 50Hz or 60Hz.
Not sure what country you are in

Hope this Helps or gives you food for thought!


Three phase electric power
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Jul 08, 2015 • Hobart Food Mixers
0helpful
1answer

Marathon wiring
Are you sure? Single phase pool motors are not reversible (unless something weird happened that I can't explain). Three phase motors are reversible, but very rare in residential wiring.

Looking directly at the end of the motor shaft (where the impeller goes) it should spin counter- clockwise. Both of the power wires can be attached to either terminal; there is no "polarity".
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Nov 16, 2013 • Hayward 2HP Pool Pump Motor A O Smith...
0helpful
1answer

How to reverse rotation on type k4120 3 phase motor?
hello

make note of positions of wires and colors before moving and wires so can be put back if need to

in general 3 phase motors can be reversed by reversing only one of the phases that come in

as far as i know forward rotation sequence would be red, yellow, blue , (these are the 3 phase wires and could also have a black wire nuetral if the motor is a unbalanced load motor

but think that phase color blue is now white according to electricity regs for 3 phase motors

if the motor is a balanced load motor it may not have a black wire
.
(the function of the nuetral conductor is to to carry the out of balance current if the loads on each of the 3 phases is diffenent ) and of course has a earth wire as well ( which is yellow/ green )

you should reverse either red and yellow position only or yellow and white position only

but if in doubt check with your local electrcian to confirm
always check electrcity regs before altering

cheers






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May 29, 2011 • Garden
1helpful
1answer

Which way does motor turn
Hi,
The motor is reversible by changing the wiring in the box on the side or the back of the motor...
Look on the label on the side to see which wire need to be changed to reverse the direction of the motor..

For many motors you will reverse the 5 and the 8 wire....on some you will reverse the red and the black.. on others there will be a different combo....

on three phase motors you can reverse any of the incoming leads to reverse it...

heatman101
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Jan 19, 2011 • AO Smith 1.5hp Pool Pump Motor 2 Speed Ao...
0helpful
1answer

I have a 3 phase electrical motor for my air compressor, How would i connect this from the air compressor pressure switch and towards the electrical source 120V? (for low volt)
If the electrical 120 volt source is single phase, the only way to run this motor is with a single phase to three phase converter. Best to sell the three phase motor and obtain a similar horsepower 120 volt single-phase capacitor-start motor (1750 RPM) for the compressor. You would also require a 3-phase pressure switch for use with the 3-phase motor. Hope this helps!
Read full answer
Nov 05, 2010 • Garden
0helpful
1answer

Chinese electric motor reversable. need to know how to wire switch. Wire colors are Brown, grey, blue, ged, and yellow with tracer (this is ground)
is this a single phase motor or a three phase motor
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Mar 02, 2010 • Electrical Supplies
0helpful
1answer

Is posible run a single phase electric motor from a source three phase 120/208 wye connection the motor is rated 230 volts AC
It is indeed possible to use ONE Phase to run a motor, You simply use One Phase and Neutral. BUT ONLY if the 3 phase is Double, more or less, the required usage Voltage, EG: 440 3 phase, will be OK, for 220 single phase, . But 220 3 Phase,will not run a 240. single Phase. So in your case is suspect not, it really will do no harm to try though. it just wouldn't work, if not enough "juice", be careful.
http://en.wikipedia.org/wiki/Three-phase_electric_power
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Feb 24, 2010 • Heating & Cooling
0helpful
2answers

I need to build a single phase to three phase starting system for my compressor. I already have the starting and running capacitors, motor, the relays, box and wiring. I just need further instruction. I...
You will need a rotary converter for this, or a single phase motor. A three phase motor absolutely cannot be made to run on single phase otherwise.
Read full answer
Jul 18, 2009 • Ingersoll Rand Type 30 Electric Driven Two...
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