Reducing direct Line powered 120vac supply from 170 to 150 vdc

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Thread: Reducing direct Line powered 120vac supply from 170 to 150 vdc

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    Default Reducing direct Line powered 120vac supply from 170 to 150 vdc

    I get a lot of people who want to run their servo motors directly from line voltage without a transformer.
    Here is a way to reduce the voltage output from the direct 169 VDC that you would get if you directly rectified the 120 (120 x 1.141)= 169 Vdc

    Using the secondary of a 12 volt (or greater) transformer out of phase with the 120 volts, it will subtract 12vac volts and give 108 VAC (just as you would get 132 vac (120+12) if it was in phase )


    You can also add a In-rush current device to the 120v input to help reduce surge current when power is first applied such as this one
    Digikey part # 570-1062-ND

    Larry K

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    Attached Thumbnails Attached Thumbnails Reducing direct Line powered 120vac supply from 170 to 150 vdc-reducing-120vac-108-jpg  
    Manufacturer of CNC routers and Viper Servo Drives
    www.LarkenCNC.com and www.Viperservo.com


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Reducing direct Line powered 120vac supply from 170 to 150 vdc
Reducing direct Line powered 120vac supply from 170 to 150 vdc