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AMC or the hbridge f*cked

Discussion in 'SimTools compatible interfaces' started by Hardsteel73, Apr 18, 2012.

  1. Hardsteel73

    Hardsteel73 Hardsteel73

    Joined:
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    My Motion Simulator:
    2DOF
    Hi I'm using both amc and hbridge from tronic, but somehow i can move the motor connected to M1 only to one side.....
    On the display the Pots work fine. swapping them makes no difference. also swapping motors makes no difference. finally swapped the mosfets from M2 to M1.... did not work either. meassuered the resistance from all mosfets on the middle and right leg. If resistance is 0 then it should be broke, but none were....
    Anybody have any suggestions?
    Hardsteel73, Apr 18, 2012
    #1
  2. eloverphx

    eloverphx Member

    Joined:
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    My Motion Simulator:
    2DOF, Joyrider
    Hey there again. I see you tried moving your mosfets with no cure for your issue. Have you tried following the guide for testing the h-bridge without the amc?
    Testing Procedure
    You can test the DSMhB 1.2 manually with this procedure:

    Connect the PWM1 line to +5v
    Connect the M1IN1 to +5v and M1IN2 to Gnd, to see the motor rotate in one direction.
    Disconnect the M1IN1 from the +5v
    Connect the M1IN2 to +5v and M1IN1 to Gnd, to see the motor rotate to the other direction.
    You can perform the above test with no motors mounted, and just watch the status LEDS light one at a time. And you can try it on the second half of the DSMhb1.2 by using the rest of the ports (PWM2, M2IN1, M2IN2)


    EDIT: The 74HC08 chip is powered from the signal cable (from AMC1.5 for example), not from the motor power source!!!! To be able to do the above tests you need to feed it with +5v also!!!

    Taken from the h-bridge instruction sheet. This will at least rule out the amc being the root of the problem.
    I had problems with my h-bridge the first few times I fired it up. I blew up a few mosfets but managed to fix it by doing some simple voltage checks. I found bad solder joints and a couple hairline fractures in the traces that weren't visible to the eye.
    Since you say that one motor is working correctly then that is the side you want to compare the voltage readings to. What I did was leave it hooked to the amc turn both pots to full clockwise position and start measuring voltage at each part since each h-bridge is a mirror image. You will notice the voltages should be Identical at the same point on each part. After you check all the voltages turn the pots to the full countertop position and test all the points again, comparing them until the voltages don't match. When you find that spot, research why that is. Could be cold joint solder, cut trace, or a bad part.
    It's frustrating I know but I think you will find the issue just by testing voltages. Let us know how it turns out.
    Good luck
    Erik
    eloverphx, Apr 20, 2012
    #2
  3. Hardsteel73

    Hardsteel73 Hardsteel73

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    My Motion Simulator:
    2DOF
    Thanks mate. Did like you. Check with pots to the left andthen right....found one bad soldering! It is all working know. Time to make the steel frame!
    Hardsteel73, Apr 20, 2012
    #3
  4. eloverphx

    eloverphx Member

    Joined:
    Dec 14, 2011
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    79
    Occupation:
    Electrician
    Location:
    Shakopee, Minnesota, USA
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    297Coins
    Ratings:
    +18 / 0 / -0
    My Motion Simulator:
    2DOF, Joyrider
    Great to hear you found it good luck on your build.
    eloverphx, Apr 20, 2012
    #4