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IndustryArena Forum > MetalWorking Machines > Okuma > Alarm on my LB-15 today. Need some Ideas
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  1. #1
    Join Date
    Oct 2008
    Posts
    105

    Alarm on my LB-15 today. Need some Ideas

    After letting my 1987 LB-15 sit idle for a week or so, we needed to start it for a run. It boots up like normal and the y axis moves fine...but when you try to jog the z axis an alarm pops up.

    100-4 Alarm-A DIF
    over z-axis 38B98

    We looked at the servo and screw for the Z. Powered down, you can move the screw by hand easily both ways. When you try to jog, it does not move the servo at all. I looked at the drive card. Before you put the machine into fault (alarm) mode, the x axis has a green light on but the z does not. When it goes into fault, there is a yellow light on y axis (card) and again no lights on the z axis.

    Any thoughts?

  2. #2
    Join Date
    Nov 2010
    Posts
    89

    Re: Alarm on my LB-15 today. Need some Ideas

    In your Axis data page what is the RDIF/RCON and RAPA values on the Z Axis?

  3. #3
    Join Date
    Oct 2008
    Posts
    105

    Re: Alarm on my LB-15 today. Need some Ideas

    In Non-Faulted mode RDIF=0 RPAP=325.8477 RCON=325.8477 RLOAD=-163
    In Faulted mode RDIF=-.3347 RAPA=325.8477 RCON=325.3928 RLOAD=0

  4. #4
    Join Date
    Nov 2010
    Posts
    89

    Re: Alarm on my LB-15 today. Need some Ideas

    My guess is either and encoder fault or a Axis driver card. If the driver card and SVC card is the same on both Axis 50A/50A for example you Can Try switching then and if the erroer moves to the X Axis you found the fault.

  5. #5
    Join Date
    Feb 2009
    Posts
    6028

    Re: Alarm on my LB-15 today. Need some Ideas

    Check the breaker on the drive, should be next to the power terminals under the top board. Drive should have a green light on, since it has no power the axis simply isn't moving though commanded to do so.

  6. #6
    Join Date
    Dec 2014
    Posts
    0

    Re: Alarm on my LB-15 today. Need some Ideas

    Hi, does the servo card has no lights on it after switch on power? , if so 100% sure that problem is on card, you should change it but be sure to check if power transistors are ok cause if not, they can burn a new drive card again.


    Enviado desde mi iPhone utilizando Tapatalk

  7. #7
    Join Date
    Dec 2014
    Posts
    0

    Re: Alarm on my LB-15 today. Need some Ideas

    Hi

    Don't change the cards between drives without testing before if power unit is ok ( a failure in a power transistor can burn again a new drive card). If no lights are ON 100% the problem is on the card, but please check power transistors and 3phase rectifier ( they are located under the drive card)

    If you want to contact me for further explanations please contact me at [email protected]


    Enviado desde mi iPhone utilizando Tapatalk

  8. #8
    Join Date
    Oct 2008
    Posts
    105

    Re: Alarm on my LB-15 today. Need some Ideas

    I tried the breaker...and the reset on the contact relay. They are fine. I ended up swapping leads and top boards to see if the power side (bottom) was bad. Once I swapped these, the upper board was z and the bottom was x (reversed). I had the same symptoms. The x top card lit up plugged into the z bottom side and the z top card was still dark. I think this proves that I have power to the Z top card and not through it.
    The x and z top cards are the same part number, but the dip switches are in different position. I believe this top card is my problem, and assume that I can purchase one, set the dip switches like my original unit, and plug/play. Is this reasonable?

  9. #9
    Join Date
    Nov 2010
    Posts
    89

    Re: Alarm on my LB-15 today. Need some Ideas

    This is it. But these old cards are not available "New", you will have to upgrade to BL-4 card. Or buy a used

    If you buy a new BL-4 the dips switch will be different

  10. #10
    Join Date
    Feb 2009
    Posts
    6028

    Re: Alarm on my LB-15 today. Need some Ideas

    And the new drive units cost as much as the machines. As much as I like Okumas, i can't believe the poor support for older controls.

  11. #11
    Join Date
    Nov 2010
    Posts
    89

    Re: Alarm on my LB-15 today. Need some Ideas

    In my region approximately 4500£

  12. #12
    Join Date
    Feb 2009
    Posts
    6028

    Re: Alarm on my LB-15 today. Need some Ideas

    Yep, about 7K US, however i think they charge closer to 8K here. If it was Fanuc, you could get an exchange unit for ~$2200.

  13. #13
    Join Date
    Aug 2011
    Posts
    2517

    Re: Alarm on my LB-15 today. Need some Ideas

    we have had the same issues about getting replacement units for servo/spindle drives.
    Okumas excuse is they can no longer get parts to repair the drives from the original manufacturer. the cause of the fault is almost always on the top board.
    The excuse is very weak since it is still possible to buy parts from other places and I doubt they would need 20k/month supply throughput like they claim they need.
    Basically they want to sell you a new unit at high cost and bend you over and make you pay just because they can.

  14. #14
    Join Date
    Aug 2012
    Posts
    164

    Re: Alarm on my LB-15 today. Need some Ideas

    This is why we have spent a significant amount of money and time to develop full repair and testing of BLD, BLIID and newer drives; the cost from Okuma for this older stuff is really high. The irony is that they are great machines and are built to last for a very long time, but then they actually start to outlast the support. For the controls and drives, we have fully functional simulators and full support. If you need help or parts, you can email me at [email protected]. Please note: even if you have diagnosed the problem, we do not sell top boards (or base units) separate from each other with a warranty. We do provide full 1 yr warranty on drives (exchange or repair) but they go out as a set - top board and base unit together. We will also do repairs, but again, if you want a warranty, it must be the entire set. We have done/can do just the board/base unit for customers, but we do not provide a warranty (as we don't know the condition of the mating part).

  15. #15
    Join Date
    Oct 2008
    Posts
    105

    Re: Alarm on my LB-15 today. Need some Ideas

    I have sent the Z-Axis top board off for repair. I found a similar company a couple of states away that repairs them and offers a 3 year warranty along with a 10 day or less turn around. I will report back once I receive my board and verify that the problem is repaired.

  16. #16
    Join Date
    Oct 2008
    Posts
    105

    Re: Alarm on my LB-15 today. Need some Ideas

    I am just now getting back to reporting the outcome of the resolution. The company I used repaired the top axis driver board and the LB-15 went right back to work. I am attaching a pic of the parts on the board that were replaced by the company.Click image for larger version. 

Name:	Parts Replaced 1.jpg 
Views:	0 
Size:	86.9 KB 
ID:	266320Click image for larger version. 

Name:	Parts Replaced 2.jpg 
Views:	0 
Size:	96.7 KB 
ID:	266322

  17. #17
    Join Date
    Jan 2015
    Posts
    42

    Re: Alarm on my LB-15 today. Need some Ideas

    Where did you send your board for repair?
    Thanks

  18. #18
    Join Date
    Oct 2008
    Posts
    105

    Re: Alarm on my LB-15 today. Need some Ideas

    ERD LTD, Inc. in Kernersville,NC.
    ERD: The Leader in Industrial Electronic Repairs

    Great to deal with.

  19. #19
    Join Date
    Jan 2015
    Posts
    42

    Re: Alarm on my LB-15 today. Need some Ideas

    Are you still having problems here?
    Email me [email protected] for some help

  20. #20
    Join Date
    Oct 2008
    Posts
    105
    I appreciate the offer but it is working now. My top board on the z axis drive stack was repaired and the Okuma is back in action. The board was gone for a couple of weeks but it was around New Years so no harm.

    Are you a tech?

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