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IndustryArena Forum > CNC Electronics > Servo Motors / Drives > Encoder/feedback unit fg n tg?

Thread: Encoder/feedback unit fg n tg?

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  1. 11-26-2014, 06:28 AM #1
    integerspin
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    Encoder/feedback unit fg n tg?

    Just sketching out a wiring diagram and I happened to look at my old notes and my feedback units,
    Yaskawa TFUE-25ZD7 and 30ZD7 have two connections, labeled FG and TG, that I have no idea
    what they are?
    All I can find online is people flogging them.
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  2. 11-26-2014, 04:07 PM #2
    Al_The_Man's Avatar
    Al_The_Man
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    Re: Encoder/feedback unit fg n tg?

    FG is usually = Frame Ground, TG = T? Ground ?
    Could be the logic ground?
    Al.
    CNC, Mechatronics Integration and Custom Machine Design

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  3. 11-26-2014, 07:28 PM #3
    integerspin
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    Re: Encoder/feedback unit fg n tg?

    Wonder if it is tacho generator?
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  4. 11-26-2014, 08:27 PM #4
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    Al_The_Man
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    Re: Encoder/feedback unit fg n tg?

    Tach Ground maybe?
    What is the rest of the notations?
    Al.
    CNC, Mechatronics Integration and Custom Machine Design

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  5. 11-27-2014, 07:20 PM #5
    integerspin
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    Re: Encoder/feedback unit fg n tg?

    I was looking at a sketch of the plug pinout, when I saw tg and fg, seems
    there is actually a TG+ and TG-, I would say gotta be a tach, but I am rarely ever right;-)
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  6. 11-27-2014, 07:43 PM #6
    Al_The_Man's Avatar
    Al_The_Man
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    Re: Encoder/feedback unit fg n tg?

    Quote Originally Posted by integerspin View Post
    Wonder if it is tacho generator?
    Looks like you were right, Tach Generator, strange though, if it is part of an encoder it would be a digital tach, not a DC version, unless it is separately wired, if DC tach, they are rarely used now on modern drives.
    Al.
    CNC, Mechatronics Integration and Custom Machine Design

    “Logic will get you from A to B. Imagination will take you everywhere.”
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