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Need wiring diagram for 3 phase electric motor

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Motor leads on a three phase are T1, T2, T3, T4, T5, T6, T7, T8, T9. for high voltage [480] L1 to T1, L2 to T2, L3 to T3, connect together and tape - T4-T7, T5-T8, T6-T9. For LOW voltage [240] L1 to T1 & T7 & tape, L2 to T2-T8 & tape, L3 to T3 & T9 & tape. T4-T5-T6 together and tape.

Posted on Oct 20, 2009

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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

1 Answer

I just had my electric motor rewound. At first I had 3 wires coming out of it now I have 9 that are number coded. I need to know which wires I need to hook up. The man at the motor shop said don't use


Apparently you have a three phase dual voltage motor. The wiring should be on the nameplate or in the junction box. You will need to know what voltage you have. There are standard wiring diagrams for three phase motors. If he rewound the motor he should have given you a diagram or there should already be one there. If he doesn't help ask for your money back.

Nov 24, 2014 | Pool & Spa

1 Answer

How do I reverse a three phase electric motor?


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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1 Answer

Electric Phases for Hobart Oven


you must understand this : your electric oven must be indicate if it is a single phase( use 3 wires for 230 2 hot wires + 1 Neutral see the diagram like dryer? you must sure about this. Normally any appliance for home are single phase NOT 3 phase.

2) If you electric oven, say 3 PHASES( use 4 WIRES, 3 hot wires+1 Neutral wires) this for industrial application +comercial 270266c5-a0ad-44dc-9f40-e963255d47f5.jpgNOT for home

However if you system is 3 phase you must need to install 3phase transformer.ba1c9d4d-85e3-4744-8ce5-2f25c6e34ad3.jpg

Jul 18, 2013 | Hobart HEC501-240V Electric Oven

1 Answer

Powermatic 66 wiring problem


Simple solution: switch two of the wires. Doing so will reverse the direction of the motor. You can switch it at the motor or on the electrical plug end.

Mar 28, 2013 | Powermatic 66 10" 3 HP 1 Phase 230V Table...

1 Answer

I need a three phase wiring diagram for 8145-20 model timer.


8145-20 240Volt Paragon timer is not 3-phase.
Clock motor is 240V.
You need a transformer to convert 3-phase to single phase 240V to operate timer.
Then timer outputs can control 3-phase power using 3-phase contactors
Contactor below is 3 phase with 240V coil
http://www.grainger.com/Grainger/DAYTON-Contactor-2UTP7?Pid=search

Defrost timer wiring diagrams show below:
http://waterheatertimer.org/Paragon-timers-and-manuals.html#defrost

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1 Answer

I need a wire diagram for a high voltage Baldor motor CAT # 054180 79151 connect to 440VAC it's a 40HP, RPM 3525 , 3PH and it's SPEC# 40F97Z22 please help


Normal wiring for this type of 9 lead motor to 440VAC is
Connect #4 to #7 Connect #5 to #8 Connect #6 to #9
Connect supply phase A to #1 Connect supply phase B to #2 Connect supply phase C to #3
Can you confirm the CAT and SPEC numbers? They do not show up on the Baldor site. If they are correct as listed, you need to call the Baldor help line and find out if this is a special motor.

Aug 05, 2010 | Gb Electrical 100 Amp GE Load Center

1 Answer

How do I wire a three phase electric motor to 110 plug


You can't run a 3-phase motor on 110V unless you use a 3-phase inverter. Depending on the size of your motor, these will probably run you around $150 for the least expensive type. Take a look at--- http://americanrotary.com/static-phase-converters.html

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1 Answer

Need a wiring diagram for 5kcp39fg general electric motor


if it has a brown/purple,and black wires and is a single phase motor, the purple and black are your 2 hot phase wires, and the brown goes to the motor capacitor and on other motor cap term that goes back to the purple phase wire

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