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One way Roll vibrations

Discussion in 'Radian' started by Cedric Duchateau, Mar 27, 2013.

  1. Cedric Duchateau

    Cedric Duchateau New Member

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    Hi,

    I searched the forum but didn't find anything looking like my problem. I maybe did something wrong in my setup. If not, it's maybe a defect servo. Let's see my specs and videos to understand and perhaps help me.





    Aircraft Type: CS6
    Gimbal Type: CS 2 axis
    Radian Type ( 1, 2 , 3 axis) 2 axis
    Gimbal Power source: 3S Lipo via 6V BEC
    Gimbal Radio Type: DX6i
    Radian Communication Protocol (S.Bus, PPM, PWM, Spektrum) Spektrum

    Connections: Change these to match your setup
    Roll Sensor:
    Port
    1. 6V Power
    2.
    3. To Tilt sensor
    4. To Roll Servo

    Tilt Sensor:
    Port
    1. From Roll Sensor
    2.
    3.
    4. To Tilt Servo

    Pan Sensor:
    Port
    1.
    2.
    3.
    4.

    Symptoms: Roll vibrates more during left compensation. See the video to understand:

    <iframe src="http://player.vimeo.com/video/62728975" width="500" height="281" frameborder="0" webkitAllowFullScreen mozallowfullscreen allowFullScreen></iframe> <p><a href="">153879466</a> from <a href="http://vimeo.com/user17319282">TechStuffs</a> on <a href="http://vimeo.com">Vimeo</a>.</p>

    Before you ask... Yes the gimbal is balanced:

    <iframe src="http://player.vimeo.com/video/62728973" width="500" height="281" frameborder="0" webkitAllowFullScreen mozallowfullscreen allowFullScreen></iframe> <p><a href="">153896428</a> from <a href="http://vimeo.com/user17319282">TechStuffs</a> on <a href="http://vimeo.com">Vimeo</a>.</p>


    [​IMG]

    Uploaded with ImageShack.us

    [​IMG]

    Uploaded with ImageShack.us

    Thank you for your help.
     
  2. Gary Haynes

    Gary Haynes Administrator
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    Appears that your gains are set to high. What is the gain setting for the Roll Servo?
     
  3. Cedric Duchateau

    Cedric Duchateau New Member

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    First post edited: screenshots embedded.

    The Roll gain is 100, but it does the same if the gain is 70.
    If I 'tap' the gimbal with a gain higher than 100 the gimbal oscillate more and more. If I set it at 130 (like most of you do), it become crazy.
     
  4. Gary Haynes

    Gary Haynes Administrator
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    Cedric I can't see the attachments. Can you reload them by clicking the "Upload a File" button and then doing the file Upload?

    Have you tried flying it? Sometimes static testing isn't the same as behavior in flight.
     
  5. Cedric Duchateau

    Cedric Duchateau New Member

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    I edited the first post: attaching files doesn't seems to work (for me) so I embedded the screenshots (via imageshack).

    I tried it in the air and the results aren't good.
    Roll radian 'on' : vibrations
    Roll radian 'off' : clean (but not stabilized of course)
     
  6. Gary Haynes

    Gary Haynes Administrator
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    Can you show a photo of your gimbal to your copter setup? Something just isn't correct. The lowest roll gain on the shared setup Google Doc is 90. Perhaps you can switch the servos around and re-test?
     
  7. Cedric Duchateau

    Cedric Duchateau New Member

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    [​IMG]

    Uploaded with ImageShack.us
    [​IMG]

    Uploaded with ImageShack.us
    I know that the gain is really low. But I don't know why.
    I will switch the tilt and roll servos and see what happens.
     
  8. Cedric Duchateau

    Cedric Duchateau New Member

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    Switch done. It seems to be better.

    I need some test flights. But no time before friday.
    I'll keep you in touch.
     
  9. Gary Haynes

    Gary Haynes Administrator
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    Cedric if it still acts up try turning off the video TX. It shouldn't affect anything but might be a process of elimination point.
     
  10. TROU BAYLISS

    TROU BAYLISS Member

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    is roll balanced ?? looks heavy camera right .. that is looking at the back of camera trou
     

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