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Thread: OKUMA LT10-M

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  1. #1

    OKUMA LT10-M

    Hello guys

    In our company we have an old Okuma twin spindle turning centre.Could anyone tell me, what this fault mean: alarm-a 1029-41 svp sa power circuit low voltage TA .
    The book with alarm and error list explain the following: The servo amplifier has detected voltage drop in the amplifier power circuit. A warning lamp LV on the servo amplifier is lit
    AXIS-in our case is TA turret , somtime is TB
    We can produce pieces somtime eight houres or more, and than this alarm occur.
    Is it posible that is temperature in back of electric closet is to high,or the problem is somewhere else.

    And another problem i have in this machine that i cant turn turret with button in manual mode but in mdi or auto mode i can.

    I would be happy for any help

  2. #2
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    Re: OKUMA LT10-M

    First thing to check with Manual vs auto or MDI is the input from the switch. Go into Check Data for the I/O and confirm that the switch is in fact functioning. Input will toggle on/off when the button is pushed. Use the Maintenance manual for a guide of where the input is located Probable EC Input? depending on vintage of control you are working with. Another stupid idea is to make sure that you are actually on the + limits. if it's off by .0001 it's not happening. Auto may pull it back to the limit...MDI well that's different unless it's commanded to go to limits as well. It is normally required to be on the + X or Z limit to index.

    If I recall correctly, both turrets are driven off of the same drive unit. I'm guessing that the drive is getting low voltage as described or is starting to fail. Have a qualified person check some of the voltages - especially incoming voltage to make sure it's not dropping. Sometimes when the weather gets warm and the AC units start kicking in locally, voltage will drop enough to start affecting the machinery. You should have a multi tap transformer on that machine, so adjustment should be possible if needed.
    Experience is what you get just after you needed it.

  3. #3

    Re: OKUMA LT10-M

    Hello
    First i must thanks to OkumaWiz for help.
    I check data and switch is working.About soft limits i thing they are good , because i get light that confirm that limits are reached , but still manualy i cant turn any turret upper or lower.I forgot to say that okuma was resets whan I start to work on it.i check all parameters (Word,Long word and Bits) and and I think they are good .

    About low voltage alarm right now they are mounting the air conditioner on the electronics cabinet because the fans is out of order.I'll let you know next week if that was the reason for alarm.

  4. #4

    Re: OKUMA LT10-M

    Hello again

    After we mount air conditioner is the temperature in electronics cabinet ok , but still we have the same alarm-a 1029-41 svp sa power circuit low voltage TA or TB but only when the machine is cuple of hours out of production or when we start after weekend on monday.
    Than when I try to rotate turret in MDI mode (TA or TB ) alarm ocur but I can reset it and than machine works fine. Is it possible that something is hold the turret and then release it.I don't have a plan for the turret and I don't know what could be holding it back from turning.
    I would be happy for any help.

  5. #5
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    Re: OKUMA LT10-M

    How does your voltage actually check out?

    The turret has a curvic coupling that is hydrauically clamping the turret. I t will not index until it is unclamped, but it does not give the low voltage alarm in that case it would be turret unclamp alarm.

    Try to MDI the turret to the limit and then go to Mid-auto-manual to attempt the index by push button. Will that work for you?

    Best regards,
    Experience is what you get just after you needed it.

  6. #6

    Re: OKUMA LT10-M

    Hello

    Again thank you mr.OkumaWiz to helps me with my problems.
    I try to MDI turret to limit and than switch to Mid-auto-manual and when I push index button nothing happens-turret not index. Is it possible that this dont work because I don't have done limits for A-turret 2 spindle ?
    I am a beginner on this machine and we make pieces without a loader - on each spindle and without stock transfer.I have no idea what the limits for AB should be. Here are pictures of the hard and soft limits on the machine.Hope the path is correct.

    https://www.cnczone.com/forums/membe...arameters.html

  7. #7
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    Re: OKUMA LT10-M

    Your limits look strange on the A spindle 2 side. Go to your X+ Stroke End limits on A Spindle 2 and press SET and the type in the same number that is there: example: 24427.370 and WRITE. This will reset your Variable limits to their max value automatically. Repeat this on A Spindle 1. Your X+ limits should now match. Test and give feedback please.
    Experience is what you get just after you needed it.

  8. #8

    Re: OKUMA LT10-M

    Hello

    Thanks OkumaWiz for the advice and help so far.
    According to your instructions, now the limits on A Spindle 2 and A Spindle 1 match.But still i cant turn the turret in manual mode.I will check the parameters again if I missed anything.I also noticed a new problem. When I write in MDI mode for example S500 M3 - turns on the spindle. Then I go into the manual mode and I can't recall the turns manually with the ccw or cw keys.
    Problems keep coming one after another.

    Best regards and stay healthy

  9. #9

    Re: OKUMA LT10-M

    Hello

    Mr. OkumaWiz
    In attachment parameters from machine from today.

  10. #10
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    Re: OKUMA LT10-M

    For spindle rotation, check your Machine System Parameters (spindle)

    1st/2nd spindle S command cancel by M02/M30
    When an M02/M30 command is executed, the S command value effective up to that point is cancelled.

    This will also cancel the S commanded spindle speed by reset (switching modes). I'm assuming the door is closed of course.

    You may also want to check this for the Milling Spindle


    SB command cancel by M02/M30
    When an M02/M30 command is executed, the S command value effective up to that point is cancelled.

    Do you have an Operation manual for the LT- series for your machine? I'm thinking that you may have an interlock parameter such as ZB-W that may be affecting your turret indexing. Is the indexing issue occurring on both turrets? Are you taking the A-turret to both X+ and +Z limits in G140? Is the B turret at X+ Z+(w+)? Can you spin the spindle at 1500 RPM with the door close to make sure the door interlock is working correctly?


    LT200/LT300 SERIES
    OPERATION MANUAL





    BTW which control are you using on this machine?











    Experience is what you get just after you needed it.

  11. #11
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    Re: OKUMA LT10-M

    One more thing...When you push the turret index button, do you hear the turret unclamp or not?

    Best regards,
    Experience is what you get just after you needed it.

  12. #12

    Re: OKUMA LT10-M

    Hello


    Thanks OkumaWiz for help.
    I'm sorry I didn't answer for a while because I was on vacation.
    YES the spindel rotation problem is solved.Like you said it was a optional parameter Nr.34 bit 2 which was the problem.Now works fine.Thanks to You.
    The controller on the machine is OSP 7000L.
    When I press the turret rotate button I don’t hear anythingt that the turret is unclampt and yes i have problem indexing on both turrets.
    If anyone has a similar machine I would ask if he can send backup parameters of his machine to this post that i be able to compare with ours.


    Best regards

  13. #13
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    Re: OKUMA LT10-M

    Do you have your Z+ A turret limits set so that when in G140 the Z stops about 1/2 way between spindles? It should do the same when in G141 preferably to the same location. It should not travel further until the spindle mode is switched. Also check your W+ and Z+ limits on the lower turret to make sure they match exactly. I’ll check locally to see if I can get a parameter backup from an LT-10.

    Best regards,
    Experience is what you get just after you needed it.

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