Hook up 3 phase motor

The goal here is to provide a basic instruction set that will make any future project, whether at home or at work, that much easier to perform.

How to check a 3 phase motor system

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Wye Configuration, Low Voltage

Motors Generators and Transformers. Ensure that any electrical power fed into power cord, is shut off prior to working on motor.


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  • How to connect a three-phase motor - Electrical Engineering Stack Exchange.

Using a pair of diagonal cutters, cut and remove 3 in of rubber insulation around outside of power cord. Revealing four wires inside cord. Once for inner lines are visible remove approx.

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Be aware that the power lines are referred to as: L1, L2, L3 respectively however there is no specific order to the power lines, meaning these tittles can be used interchangeably. Connect ground wire to wire terminal.

Using a crimping tool, connect ring terminal to the end of ground green wire. Examine or check the motor. Using a flat head screwdriver remove four hex head screws securing cover plate of conduit box.


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  6. This is located on the motor. Using standard wire connectors twist and connect wires in the following order: Connect motor to power source.

    3 phase electrical hook up - InternshipsAnywhere

    Feed exposed end of power cord through circular hole of conduit box. Wire power cord to motor. Connect power lines to wires located within motor by using standard wire connectors in the following order: Ensure all of connectors and wires are tight and secure. Tug on connectors lightly to confirm proper installation. Check continuity of connections.


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    Place tip of red test lead into electrical connector and the tip of black test lead onto the any pin of the plug. A three-phase motor is more efficient than a single-phase motor because of the peculiarities of alternating current AC. Electrical power, you may recall, is the voltage level multiplied by current flow. A three-phase motor may be set up in one of two configurations: Also, these motors have either six or nine leads. With a six-lead set-up, you cannot choose whether you get a high-voltage or low-voltage system, but with a nine-lead set-up, you can select either one, using either configuration.

    This offers a total of four wiring possibilities. For reference, L1, L2 and L3 are usually black, red and blue respectively. The motor leads T1 through T9 are normally, in order, blue, white, orange, yellow, black, gray, pink, red and brick red.

    Connecting 1 Phase Motor to 3 Phase VFD

    Refer to a diagram, if possible, when following the steps below. Connect 1 and 7 to L1, 2 and 8 to L2, and 3 and 9 to L3. Attach the remaining leads 4, 5 and 6 together.