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Thread: 401, 410 ALARM Fanuc O-T

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  1. 11-28-2011, 05:43 PM #1
    F-Stop
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    401, 410 ALARM Fanuc O-T

    Hi all,

    I have a puma 12LC fanuc O-T control, and recently it has an ALARM 401 Servo alarm: (VRDY OFF) and 410 Servo alarm: X axis excess err. This alarm happen most of the time when the machine is doing rapid move. I google around the net and many expert saying it is a pulse coder. How do i fix this problem? Please Help.

    Thank you very much.
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  2. 11-28-2011, 05:58 PM #2
    Al_The_Man's Avatar
    Al_The_Man
    Al_The_Man is offline Community Moderator
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    Not necessarily the encoder.
    With a slant bed lathe and the X axis carrying the turret, check on what style of counter balance it has, if this is not working, it places a strain on the X servo motor.
    Check the diagnostic registers.
    Al.
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    CNC, Mechatronics Integration and Custom Machine Design

    “Logic will get you from A to B. Imagination will take you everywhere.”
    Albert E.
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  3. 11-28-2011, 06:05 PM #3
    alexfanuc
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    Yes, it could be a mechanical problem.
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  4. 11-28-2011, 06:39 PM #4
    F-Stop
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    Hi Al The Man,

    Looking at your pdf, I dont understand the formula at Note 1

    What is the PRM517? and how do i get the dection unit value?

    If my X axis is 480 IPM then it equal 12192 mmPM right?
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