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HB25 Fault LED — Parallax Forums

HB25 Fault LED

tfallingtfalling Posts: 6
edited 2010-09-25 13:12 in General Discussion
I just got a HB25 motor controller. I was driving small RC motors with it using a 5 Amp DC power supply and a BS2. At one point it seemed to stop working. The green LED is on and bright. The red (fault) LED is very dimley lit up. I didn't notice if this was the case when it was working. Does anyone know if this is normal operation?

Comments

  • RobotWorkshopRobotWorkshop Posts: 2,307
    edited 2010-09-17 11:39
    Can you give us a few more details on how everything is setup? What voltage are you running the HB-25's at (12v)? Do you have a schematic for how everything is wired up?

    You mention that "at some point it seemed to stop working" Was there a point when you had it wired up and working just as you expected?

    What BASIC Stamp module are you using? Can you post the code too?

    Robert
  • tfallingtfalling Posts: 6
    edited 2010-09-23 20:21
    I'm guessing I had a coding error. I was playing with code when it stoped. I started over last night and it was working. I also may not have had the current set high enough for the motor I was driving. Every thing seems ok for now. Thank for the reply.
  • tfallingtfalling Posts: 6
    edited 2010-09-25 06:24
    Figures... spoke to soon. So I am using a BS2 (OEM moudule) with the HB25. I am using a 9v to power up the BS2. I am using 3 A123 (18650) cells to power the HB25 which is equal to about 9.9v and 30 amps. I am wanting to drive a 19 turn (or 27 turn) R/C motor. I think they are like a size 540 (don't know what that is measureing). Without the HB25 the cells will drive the motors great. When I use the HB25, I get (most of the time) a small pulse to the motor. Sometimes however I will get a good run.

    I have a servo cable connecting the two. (White--P15, Red--P14, Black--13). And WRB are connected repectivly to the HB25

    The code looks like this:

    LOW 13
    LOW 15
    PAUSE 2000 'HB 25 STARTUP

    PULSOUT 15, 750 'NETURAL
    PAUSE 1000

    PULSOUT 15, 1000 'HAMMER DOWN
    PAUSE 10000

    PULSOUT 15, 500 'BRAKE
    PAUSE 500

    PULESOUT 15, 750 'NETURAL

    END

    I can see that the BS2 is pulsing with the scope. I have also tried to refresh the pulse every 40ms to which I got a motor pulse every 40ms or so. I would like more information on the HB25's current limiting handling. Does the IC have a current limiting circuit or is the only limiting device the 25 amp fuse (which hasn't blown by the way). Speeking of current the stall current for the motors is about 10-11 amps (using a 10amp max meter).

    The whole purpose here is to drive the biggest motor possiable. I am building a "Sum bot", but a very fast one. The motors I have here come from the high end R/C cars, although I see now they like to use stepper motors. I have to stay under 1Kg and these motors with the A123 cells are going to get me right there plus giving me the high current. I am open to any suggestions out there.
  • sam_sam_samsam_sam_sam Posts: 2,286
    edited 2010-09-25 12:21
    tfalling

    I am using 3 A123 (18650) cells

    Are you using a voltage protection board for the cells :)
  • W9GFOW9GFO Posts: 4,010
    edited 2010-09-25 13:08
    The fuse is for extra protection, the HB-25 will go into a fault mode if you try to put too much current through it.

    Rich H
  • W9GFOW9GFO Posts: 4,010
    edited 2010-09-25 13:12
    tfalling wrote: »

    I have a servo cable connecting the two. (White--P15, Red--P14, Black--13). And WRB are connected repectivly to the HB25

    White is the signal, it should be connected to a pin on the Basic Stamp. Red should be connected to 5v and Black to Ground.

    Rich H
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