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  1. #21
    Join Date
    Dec 2009
    Posts
    947

    Re: fanuc 18m 351 alarm

    so we isolate the problem that could come from the optical encoder that should be connected to spindle by a small belt?

  2. #22
    Join Date
    Jul 2010
    Posts
    46
    I will check it tomorrow.
    Thanks for the help.
    Michael

  3. #23
    Join Date
    Jul 2010
    Posts
    46

    Re: fanuc 18m 351 alarm

    I found out that the previous owner had replaced the spindle motor and this one has inside a MZ sensor although the old one had a M sensor, because the plans I have state this.
    I checked the cable of MZ sensor and the only problem I found was that the shield is not connected to earth directly, but to pin 10 of the JY2.
    I checked the parameters and as far as can judge seem ok.
    I can not understand what that would be to trigger the alarm of X-axis communication even if it seems that is something with the spindle orientation.

    Michael

  4. #24
    Join Date
    Dec 2009
    Posts
    947

    Re: fanuc 18m 351 alarm

    what show diagnose 200,201,202,203,204 when alarm occur?

  5. #25
    Join Date
    Jul 2010
    Posts
    46
    Only 2003 X crc=1 and stb=1, all others are 0.
    This morning I tried some g84 cycles and alarm 351 continuous and also #200 x dca=1

  6. #26
    Join Date
    Dec 2009
    Posts
    947

    Re: fanuc 18m 351 alarm

    that means mainboard or option board fault

  7. #27
    Join Date
    Jul 2010
    Posts
    46

    Re: fanuc 18m 351 alarm

    Do you know how to change the mainboard?
    I think I don't have option2.

  8. #28
    Join Date
    Jul 2010
    Posts
    46

    Re: fanuc 18m 351 alarm

    Attachment 419498

    this is my mainboard.
    Couldn't reply to your PM. Your storage is full.

    Goodmorning
    Michael

  9. #29
    Join Date
    Jul 2010
    Posts
    46
    I checked the pulse coder cable, OK.
    I added a cable to ground from the replaced MZ sensor (the machine originaly had a M sensor in the spindle motor).
    This way the alarm hasn't appeared yet.
    Let's see.....

  10. #30
    Join Date
    Jun 2009
    Posts
    12

    Re: fanuc 18m 351 alarm

    hi michael .
    how to solve your problem # alm 351 ?

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