QT28 with T2 control spindle drive issues
Close
Login to Your Account
Results 1 to 9 of 9
  1. #1
    Join Date
    Dec 2017
    Country
    UNITED STATES
    State/Province
    Michigan
    Posts
    35
    Post Thanks / Like
    Likes (Given)
    0
    Likes (Received)
    2

    Default QT28 with T2 control spindle drive issues

    Hi,

    I have a QT28 with T2 control. It will run the spindle at 1000rpm all day long but if we go much faster the spindle drive will fault out giving an ALO 32 alarm (over voltage something). It is a FR-SF drive. Any thoughts on what the issue is?

    Thanks

  2. #2
    Join Date
    Jul 2010
    Location
    Rochester, NY USA
    Posts
    2,172
    Post Thanks / Like
    Likes (Given)
    10
    Likes (Received)
    507

    Default

    Posting an accurate wording of the alarm is a good place to start.
    "Something" in the wording will keep most people away.

  3. #3
    Join Date
    Dec 2017
    Country
    UNITED STATES
    State/Province
    Michigan
    Posts
    35
    Post Thanks / Like
    Likes (Given)
    0
    Likes (Received)
    2

    Default

    Quote Originally Posted by hitandmiss View Post
    Posting an accurate wording of the alarm is a good place to start.
    "Something" in the wording will keep most people away.
    Thanks for the tip. Please see my update below. I tried to edit the original post but couldn't figure out how.

    Quote Originally Posted by mada87 View Post
    Hi,

    I have a QT28 with T2 control. It will run the spindle at 1000rpm all day long but if we go much faster the spindle drive will fault out giving an ALO 32 alarm (over voltage is what Mits told me on the phone but when I looked it up I found over current instead). It is a FR-SF drive. Any thoughts on what the issue is?

    Thanks

  4. #4
    Join Date
    Jul 2010
    Location
    Rochester, NY USA
    Posts
    2,172
    Post Thanks / Like
    Likes (Given)
    10
    Likes (Received)
    507

    Default

    Try running the spindle at 10 RPM.
    Does it turn smoothly, or pause (may even turn backward) then jump a little?
    You may need to look at the motor pulley to see that the jump happens at the same place in the motor rotation.

    If jumpy, the power supply at the top of the FR-SF that has a bunch of voltages that it provides.
    There is probably 1 or more that are low or missing.
    Then there will be sections of the 3 phase power to the motor that are missing.
    As the speed increases, the current draw on the phase after the missing section will tend to have an overload, if severe enough, the overload can take out the associated power transistor module.

    Bill

  5. Likes cnctoolcat liked this post
  6. #5
    Join Date
    Dec 2017
    Country
    UNITED STATES
    State/Province
    Michigan
    Posts
    35
    Post Thanks / Like
    Likes (Given)
    0
    Likes (Received)
    2

    Default

    Quote Originally Posted by hitandmiss View Post
    Try running the spindle at 10 RPM.
    Does it turn smoothly, or pause (may even turn backward) then jump a little?
    You may need to look at the motor pulley to see that the jump happens at the same place in the motor rotation.

    If jumpy, the power supply at the top of the FR-SF that has a bunch of voltages that it provides.
    There is probably 1 or more that are low or missing.
    Then there will be sections of the 3 phase power to the motor that are missing.
    As the speed increases, the current draw on the phase after the missing section will tend to have an overload, if severe enough, the overload can take out the associated power transistor module.

    Bill

    Just tried and at least to the naked eye it does not appear to jump at all, seems to run pretty smooth

  7. #6
    Join Date
    Dec 2017
    Country
    UNITED STATES
    State/Province
    Michigan
    Posts
    35
    Post Thanks / Like
    Likes (Given)
    0
    Likes (Received)
    2

    Default

    I am now finding that I can run it up slowly to 1500 rpm in hand mode and if I stop the spindle it then will fault and give me an ALO 33 over voltage. At the moment I'm not sure that I can reproduce an ALO 32 alarm. We did still run all day making parts just limited to 1000 rpm (I'm working on it after hours now).

  8. #7
    Join Date
    Jul 2010
    Location
    Rochester, NY USA
    Posts
    2,172
    Post Thanks / Like
    Likes (Given)
    10
    Likes (Received)
    507

    Default

    Check the 3 phase power to the bottom of the FR-SF. Phase to phase and phase to ground, 6 checks.
    Line voltage may be a little high.

    When does it fault out above 1000 RPM?
    Picking up speed? slowing down? or as soon as it arrives at speed? Or while cutting.
    Are you using constant RPM or Constant surface speed?

  9. #8
    Join Date
    Dec 2017
    Country
    UNITED STATES
    State/Province
    Michigan
    Posts
    35
    Post Thanks / Like
    Likes (Given)
    0
    Likes (Received)
    2

    Default

    Quote Originally Posted by hitandmiss View Post
    Check the 3 phase power to the bottom of the FR-SF. Phase to phase and phase to ground, 6 checks.
    Line voltage may be a little high.

    When does it fault out above 1000 RPM?
    Picking up speed? slowing down? or as soon as it arrives at speed? Or while cutting.
    Are you using constant RPM or Constant surface speed?
    I will check the phases.

    At least when I have seen the issue happen it is when it is slowing down (going from 1400rpm or greater to 0).

    I'm not sure if it does it while cutting, it has happened while running parts but I have never been watching it at that point in able to tell what the machine was actually doing then and my operator wasn't sure either.

    I don't run the lathe myself so I am not sure if he uses constant rpm, surface speed or a combination.


    Note I am currently attempting to adjust the accel/decal time constant but given my specific machine control/drive combination (T2 control with an FR-SF drive, most T2's had FR-SEs) can't seem to find the info to get it changed. The parameter isn't available on the drive directly (unless I am missing something in the manual) so it appears to be stored in the NC parameters but I can't find it and Mazak seemed stumped, going to try them again later today.

  10. #9
    Join Date
    Jul 2010
    Location
    Rochester, NY USA
    Posts
    2,172
    Post Thanks / Like
    Likes (Given)
    10
    Likes (Received)
    507

    Default

    I have the FR-SF service manual BNP-A 0801-19-D-E

    File size is over 15 MB.

    The T2 control is not bus linked to the drive, so all the drive parameters are set on the drive.
    #33 is for accel.
    #5E is for speed change cushion
    #5F is also associated.
    I will try to send you a copy via email, if needed.

    Bill

  11. Likes cnctoolcat liked this post

Tags for this Thread

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •