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  • State Not Answered
  • Date bprall@cmxr.com
    bprall@cmxr.com
  • Date 24 Jul 2020 1:01 PM
  • Replies 4 replies
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VIX AE and Easi-V

bprall@cmxr.com
By  bprall@cmxr.com 5 months ago

I am trying to configure a custom Stage on a VIX AE using the Easi-V software after finding a Win 7 32 bit system that can run the software.  I can communicate with the terminal but the upload and download of the configuration says it is not supported.  I am having what appears to be commutation issues so would like to change the Commutation (-30) box I see in some of the manuals setup pages.  Anyone know the direct command to change this parameter only?

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  • bprall@cmxr.com
    0 bprall@cmxr.com 5 months ago

    Also there is this IX setting which reading the documentation takes the Z encoder input and uses the in the commutation also?  Is there a way to just turn this off as the rotory motor hits this flag fairly often so I am trying to find the proper commuation settings for two different control schemes at once with the hall and Z working against each other.

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  • bprall@cmxr.com
    0 bprall@cmxr.com 5 months ago in reply to bprall@cmxr.com

    So I started to try to just tune the IX value and find a good value at like 1000 (says the value only goes up to 1023 in the manual but that does not appear to be true) .  If I energize my stage and push it around such that it definitely goes over a Z input it works great (moves the right direct with way more speed than needed) but if I just try to move it from other points using the hall commutation it likes to get stuck indicating that they are not set up right.  Once the IX commutation has become engaged does the drive switch to the quad encoder based commutation and then ignore the hall sensors?

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  • Daniel Cliffe
    0 Daniel Cliffe, Employee 5 months ago in reply to bprall@cmxr.com

    There are two entries in the User Guide that help address this.  From page 54 (PDF 60):

    IX Description
    System variable IX determines the position of the index pulse relative to phase U
    (or phase 1) of the drive. Altering the position of the index pulse allows compatibility with
    different motor types. Incorrect settings will result in uncontrollable motion.

    From page 35 (PDF 41):

    Commutation set up
    On energising the drive the commutation encoder input is captured and the torque vector set
    to be at the middle of the commutation segment..
    Whilst rotating as soon as a commutation encoder edge is observed, the torque vector is
    realigned more accurately . After the first commutation edge is observed the commutation
    input channels are ignored. Prior to passing a commutation input edge the torque may be
    restricted to 87% of the peak torque available.
    For a rotary motor more accurate alignment is made to the index mark. As soon as the
    index mark (Z input) is observed for the first time the torque vector is again more accurately
    set. If the Z mark is seen before the first commutation encoder edge the torque vector is set
    accurately and subsequent commutation transitions ignored
    The above sequence of torque vector alignment is restarted on cycling through deenergising and energising the drive.
    A Hall Effect commutation encoder signals are also used (refer to Appendix B for
    commutation details).

    Incidentally, I referenced these from the guide for the AH model as this is more applicable since that is what is used with the MX80L.  In general, do not attempt to modify the IX parameter from the value imported from the motor file.  If you are having commutation issues, the issue is likely elsewhere.

    If this issue persists, you might want to get in touch with us by email at emn_support@parker.com or by phone at 800-358-9070.

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  • bprall@cmxr.com
    0 bprall@cmxr.com 5 months ago in reply to Daniel Cliffe

    It is not a parker motor.  It is a rotory motor on a stage with a linear encoder so it should not even have an index, but we had an existing AE amplfier and the system is using 2 AH to run 2 MX80Ls so we thought it might be better to use the three amplifiers (as on software system can do the reseting and such if they are connected).  I found that the home switch got wired into the index and by tuning the IX value I could get far greater performance for the stage than I was getting in the initial commutation calculations regardless of how I connected the motor phases.

    I tested the hall sensors on the motor and compared them to the MX80L and they alternate in the proper pattern to match the direction of this stage and the MX80L

    I also put a DC bias on each possible motor phase combination (to lock the alignment) and compared the hall sensor output.  I found that they were offset slightly.  The value at rest was different but when I pushed the other stage forward a little the hall sensors would switch to the ones that matched the MX80L under the DC locking.  The MX80L when pushed forward would not switch but would switch when pushed back.

    This indicated to me I would likely need the alternative commutation setting in the setup and did that but it did not really seem to help.
    For the diagram in Appendix B are the phases shown the actually voltages or the back emf.

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