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IBT-2 H Bridge no 24v output

Discussion in 'DIY Motion Simulator Building Q&A / FAQ' started by Richard Eaton, Jun 19, 2024.

Page 1 of 3
  1. Richard Eaton

    Richard Eaton Member

    Joined:
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    My Motion Simulator:
    2DOF
    I have the strangest issue and I can't work out the issue, my IBT-2 bridges don't have an output voltage, there is 24v going in but nothing coming out, these are new bridges.....Should I get a voltage with no connections to the Uno board? Although I have also connected up and still no output.
    Richard Eaton, Jun 19, 2024
    #1
  2. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

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    My Motion Simulator:
    3DOF, DC motor, JRK
    Are you using SMC3 set to Mode 2, and if so can you please post pictures of all your settings.

    As an aside, some members have reported issues running the IBT2s at 24v and have more success lowering the voltage a little.
    noorbeast, Jun 19, 2024
    #2
  3. Richard Eaton

    Richard Eaton Member

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    My Motion Simulator:
    2DOF
    Hi, yes SMC is set to Mode 2, I've been running this setup at 24v for a while previously with no issues, I'm stumped tbh with what could be wrong, maybe it's the Uno that has the issue.
    If you are not connected to the Uno would you still see 24v output from the IBT or does it need to be connected for the throughput to work?
    Richard Eaton, Jun 19, 2024
    #3
  4. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

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    Balance:
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    Ratings:
    +10,858 / 54 / -2
    My Motion Simulator:
    3DOF, DC motor, JRK
    It should be connected and when you run say the Sine test in SMC3 the output voltage will vary to drive to the curve, hence why pictures are useful.

    With the Arduino and IBT2 hooked up turning the pot should result in measurable current output.
    noorbeast, Jun 20, 2024
    #4
  5. Richard Eaton

    Richard Eaton Member

    Joined:
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    My Motion Simulator:
    2DOF
    Firstly remember I have had my rig running for over 6 months with no issues.
    I had a mechanical issue with the CV joint and had to modify the setup, however when I tried to get it going again it appeared dead.......
    So this is where I am now:

    2 x new 24v 15amp PSU's
    2 x new IBT-2
    1 x new Uno3

    Still the same issues

    I have 24v coming from the PSU into the IBT-2 but nothing coming out to power the motor
    If I run SM3Util and turn the POTS manually then as expected my wavelength changes depending which way a turn the POT.

    I'm stumped to understand what is stopping the 24v passing through the IBT.

    I am running SM3 v1.0 and have set Mode 2

    Thanks for any help with this.....
    Richard Eaton, Jun 24, 2024
    #5
  6. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

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    +10,858 / 54 / -2
    My Motion Simulator:
    3DOF, DC motor, JRK
    If there is no power out of a control board it is likely faulty, if everything else is set up properly..
    noorbeast, Jun 25, 2024
    #6
  7. Richard Eaton

    Richard Eaton Member

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    My Motion Simulator:
    2DOF
    Hi, as you mentioned when I turn the pot it does increase the voltage, I'm testing this with a 24v fan and the fan kicks in. However it doesn't drive the motors. If I connect the motors directly to the 24v from the PSU they spin fine.
    So I have voltage, just wondering if current is the issue not enough output to move the motors.
    Richard Eaton, Jun 25, 2024
    #7
  8. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

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    My Motion Simulator:
    3DOF, DC motor, JRK
    Have you checked the output with a multi-meter, so you are actually measuring what the output is?
    noorbeast, Jun 25, 2024
    #8
  9. Richard Eaton

    Richard Eaton Member

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    My Motion Simulator:
    2DOF
    Right, so found I had a dry solder, re soldered and motors up and running, however next problem, when powered on the motor just turns and hits it's limits, set the pot position, set the motor position but SM3 tool hasn't got full control.

    Attached Files:

    Richard Eaton, Jun 25, 2024
    #9
  10. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

    Joined:
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    Occupation:
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    Location:
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    Balance:
    147,200Coins
    Ratings:
    +10,858 / 54 / -2
    My Motion Simulator:
    3DOF, DC motor, JRK
    I am having trouble reading those images, they are poor quality.

    Set Fpwm to 25.

    Initially set Clip Input and Max Limits to 200 until everything else is working as expected, then refine their settings.

    Worst case do the setup steps from scratch:

    Initial Setup
    1. Disconnect the motor power supply
    2. Make sure Simtools is not running – we’re not ready for that yet!
    3. Wire up the Arduino (with SMC3 installed) to your H-Bridges and connect to your computer via USB
    4. Run the Windows SMC3 Utility software and make sure it communicates with the Arduino (There is no need to set baud rates, they are not configurable)
    5. Set the Kp, Ki, Kd, PWMmin, PWMmax, PWMrev to 0 for ALL motors (This will make sure the motors don’t move)
    6. Set Clip to 255 (you need to do this first) and Limit to 255 (This will give you plenty of margin if something goes wrong while setting up)
    7. Turn on the power to your motors – nothing should move at this stage!
    8. Set Kp to about 400
    9. Now slowly, increase PWMmax… at some point the motor should start to move. When it does check the “Green” feedback line is moving toward the “Blue” target position.
      • If it is then that motor and feedback is wired correctly - proceed to test other motors.
      • If it is moving away turn off motor power immediately (or quickly reduce PWMmax again). In this case you need to either reverse the wires to the motor being tested –OR– reverse the +5V and GND wires to your feedback pot for the motor being tested (do not do both). Restart the test from the beginning.
    10. Do the above for each motor
    noorbeast, Jun 25, 2024
    #10
  11. Richard Eaton

    Richard Eaton Member

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    My Motion Simulator:
    2DOF
    Hi, please see YouTube video link, I have rewired, confirmed Comms, checked green line moves when turning Pot but as you will see no control just wants to spin, could the pots be duff?

    Richard Eaton, Jun 26, 2024
    #11
  12. Richard Eaton

    Richard Eaton Member

    Joined:
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    Balance:
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    Ratings:
    +11 / 1 / -0
    My Motion Simulator:
    2DOF
    I have now run out of ideas.
    New IBT-2
    New Uno R3
    Mode 2 {Also tried Mode 1 out of curiosity, same result)
    Turning the PID works, the green line moves
    If I remove the PID wire the motor just continuously rotates, which I believe is normal
    Set the PID to center
    Power on the motor, it tries to rotate still as if the PID wire wasn't attached, but hits cutoff limits and stops.
    Swapped over wiring so Motor 1 becomes Motor 2, same issue.
    Any ideas welcome.....I am stumped :-(
    Richard Eaton, Jun 28, 2024
    #12
  13. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

    Joined:
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    Occupation:
    Innovative tech specialist for NGOs
    Location:
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    Balance:
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    Ratings:
    +10,858 / 54 / -2
    My Motion Simulator:
    3DOF, DC motor, JRK
    What are your current settings and please post pictures.

    At what step in the official set up ptocedures fails?
    noorbeast, Jun 28, 2024
    #13
  14. Richard Eaton

    Richard Eaton Member

    Joined:
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    My Motion Simulator:
    2DOF
    Hi, I posted a link to a YouTube video above, hopefully it works, happy to post more detail if you need it.
    Thanks
    Richard Eaton, Jun 28, 2024
    #14
  15. Richard Eaton

    Richard Eaton Member

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    My Motion Simulator:
    2DOF

    Attached Files:

    Richard Eaton, Jul 4, 2024
    #15
  16. Richard Eaton

    Richard Eaton Member

    Joined:
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    +11 / 1 / -0
    My Motion Simulator:
    2DOF
    Anyone able to make any suggestions...Would could be wrong......
    Richard Eaton, Jul 6, 2024
    #16
  17. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

    Joined:
    Jul 13, 2014
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    Occupation:
    Innovative tech specialist for NGOs
    Location:
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    Balance:
    147,200Coins
    Ratings:
    +10,858 / 54 / -2
    My Motion Simulator:
    3DOF, DC motor, JRK
    Disconnect the power to the motor pot and check the pot is centred when on.
    noorbeast, Jul 6, 2024
    #17
  18. Richard Eaton

    Richard Eaton Member

    Joined:
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    Ratings:
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    My Motion Simulator:
    2DOF
    Hi, so if I center the pot then close down SMC3 and disconnect the Uno, when the Uno is powered back on and SMC3 started the green line stays centered, the issue occurs when the IBT-2 is connected. Tried several IBT with same result.
    Richard Eaton, Jul 7, 2024
    #18
  19. Richard Eaton

    Richard Eaton Member

    Joined:
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    241Coins
    Ratings:
    +11 / 1 / -0
    My Motion Simulator:
    2DOF
    Have setup both motors, and both are suffering the same issue, this seems to point to an issue with the Uno as that's the only part that's shared between both motors.
    Richard Eaton, Jul 8, 2024
    #19
  20. Richard Eaton

    Richard Eaton Member

    Joined:
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    Balance:
    241Coins
    Ratings:
    +11 / 1 / -0
    My Motion Simulator:
    2DOF
    This is my own wiring diagram that was updated as I wired the uno/ibt.pot.
    Still doesn't work, as soon as the PWM wires are connected the IBT gets red hot instantly.
    New Uno, new pots, newish IBT, wondering if they are now cooked and I need new ones

    Attached Files:

    Richard Eaton, Jul 10, 2024
    #20
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