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  1. #13
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    Jul 2010
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    33

    Re: fanuc 18m 351 alarm

    The machine is grounded.
    Everithing is happening when no other equipment is on at the factory.
    The strange thing is that 90% of the circumstances, the alarm is happening during or afterwards a toolchange.
    I though it might be a spark killer of the motor that brings the umbrella of the tools forward and backward to the spindle, or this motor's brake.
    I dont know how to check the spark killer and the brake is supplied ok with 90v when the umbrella motor is moving.

    Another thing is that our mains is 410V but the transformer of the machine is 380V. I have already ordered a new tranformer so I would check with 220V and not 234V as is now.
    The transformer is a little noisy, at the back side of the machine, and close by is the metal pipe whitch has the x-pulse coder cable inside. I moved the transformer about 0.5m away but still no luck.
    The power cables go from the transformer to the machine and back and for some length we have 2 power cables near the metal pipe which has the x-pulse coder inside and the metal pipe which has the y-pulse coder inside.
    I have checked DC bus is at the upper limit of DC.
    24v is OK
    5V is ok

    Thanks
    Michael

  2. #14
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    Dec 2009
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    551

    Re: fanuc 18m 351 alarm

    ok let me understand the atc cycle:
    -magazine rotate to the tool number in spindle;
    -z goes up to reference point
    -umbrella has a pneumatic cylinder moving foward to spindle side
    -tool unclamp
    -z moves to second ZRN to go out from tool
    -magazine rotates to desire tool;
    -z moves down to the tool
    -tool clamp
    -umbrella moves backward
    tool change complete

    if this is happening on tool change i would try to isolate what moving from this tool cycle is generate the alarm
    you should have M codes for magazine foward/backward;
    if so,make a small program with some dwell time between and do some magazine moving foward and backwards for ,lets say 30 minute and see if it is happening.
    also u can also do on the rotation ogf magazine by making a program with only calling a tool in standby with no tool change,like:
    T1;
    G04 X15.
    T2;
    G04 X15.
    ....

    In this way you will isolate the umbrella and motor moving.

    good luck and let us know about results.

  3. #15
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    Jul 2010
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    33

    Re: fanuc 18m 351 alarm

    The toolchange is happening exactly as you mention exept it has not a pneumatic cylinder but a 3phase motor.

    When the alarm is generated during the toolchange macro, it doesn't happen on a specific instance. Maybe it will happen when magazine goes forward to spindle side, maybe when it goes backward, maybe when z leaves the old tool, maybe when z goes down to clamp the new tool.
    It is possible to do 3 toolchanges in a row from MDI without an alarm but it will happen on the next.
    The alarm never happens when the magazine rotates buring the toolchange macro.

    I have tried to move the magazine, calling the M codes for back and forth as you said but I couldn't succeed.

    Do you think the mainboard is ok? and we have not as a cause to the alarm some noise?
    Maybe I should change the pulse coder and its cable again?

  4. #16
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    Dec 2009
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    551

    Re: fanuc 18m 351 alarm

    yes,the pulsecoder of X should be identical to Y axis so can be changed,also the cable from motor to cabinet side.

    PS:for me sounds like the there is a cable issue for the encoder of X

  5. #17
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    The alarm is happening always with the x axis stopped. I have tried to move the cable from both ends in case any of its wires is loose although I checked its wiring and ground.

  6. #18
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    Jul 2010
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    Re: fanuc 18m 351 alarm

    I have started from the begining to find maybe a pattern of what happens to trigger the alarm.
    This morning I referenced the machine then issued a M19 spindel orientation into MDI mode and all the times after some seconds the alarm happened without any movement of the machine.
    If a just reference the machine without doing anything then alarm doen't appear.

  7. #19
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    Re: fanuc 18m 351 alarm

    so if you try M19 several times will generate the alarm?

  8. #20
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    Re: fanuc 18m 351 alarm

    Every time, but the time the alarm follows it varies from 2 sec to 10 sec.
    I found that my machine has a M sensor and a position coder because there are cables connected to JY2 and JY4 ports of the spindle amplifier.
    My spindle motor is A06B-0854-B100 and the amplifier is A06B-6078-H211

  9. #21
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    Dec 2009
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    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?

  10. #22
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    I will check it tomorrow.
    Thanks for the help.
    Michael

  11. #23
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    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

  12. #24
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    Re: fanuc 18m 351 alarm

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

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