3 wire Brushed 110vdc motor wiring
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  1. #1
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    Default 3 wire Brushed 110vdc motor wiring

    Forgive me I'm spending hours on google trying to understand this motor and how to control it. I got it out of a large treadmill it is a 3hp 110vDC brushed motor with 3 wires. I want to use it to upgrade a mini mill spindle motor if I can. Do I use a SCR phase converter? and with that do I run 110vAC into it to run this DC motor? Or do I have it all wrong.

    Can you recommend a good controller to use

    I am perfectly comfortable doing electrical work on house and other machines but don't have much experience with large DC motors like this.
    Attached Thumbnails Attached Thumbnails treadmill-motor.jpg  

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    Im also confused because the motor has 3 wires black, yellow, and red

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    Looks as if the third wire is just a ground. Apparently a green/yellow wire, right? So the others are + and - and you know what to do with them.

    wiring-diagram-smooth0001

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    Quote Originally Posted by JST View Post
    Looks as if the third wire is just a ground. Apparently a green/yellow wire, right? So the others are + and - and you know what to do with them.

    wiring-diagram-smooth0001
    Im not sure, it is solid yellow and goes to a terminal labeled BW on the original controller. Ive been trying to find the actual wiring diagram for this treadmill but havn't found it yet. It was a CYBEX 445T treadmill. I also need the diagram if I want to reuse the orignal controller board and figure out which wires to short to turn it on and which wires to use for the potentiometer

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    the yellow wire has NO continuity to the motor frame so I dont think it is a ground is it?

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    Well, then it is the speed readout from connection 14 maybe.... it would surprise me if that was a single wire, though.

    What DOES that wire connect to continuity-wise?

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    OK I figured it out I finally found the right schematic and it turns out that yellow wire is just a brushes monitoring wire so the machine could tell you when the brushes needed changed. SO I can don't need to hook that one up

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    Quote Originally Posted by 57buick View Post
    OK I figured it out I finally found the right schematic and it turns out that yellow wire is just a brushes monitoring wire so the machine could tell you when the brushes needed changed. SO I can don't need to hook that one up
    Treadmill motors I've seen have the overtemp sensor located on the brushes. It could be that.

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    well the manual I found specifically says it is for monitoring the brushes and will alert you 100 hours before it shuts the machine down that the brushes are needing changed soon


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