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JRK issue of interest solved...after a long time

Discussion in 'SimTools compatible interfaces' started by bsft, Dec 26, 2014.

  1. bsft

    bsft

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    Ive been building sims for nearly 4 years, including 3 "all in ones". Yet I still learned a lesson.
    My personal ride was using for power a car battery and 13.8v psu as charger.
    Ive had big motor sim and actuator sim on that power supply.
    Ive had issues where the jrk mysteriously drops out meaning I have to unplug it, power it down and let it reset.
    Despite endless fiddling with PID, motor power settings, even changing pots, wires, usb cable and even re-installing windows and jrk drivers, using different usb ports, I still had issues of drop outs.
    Even changing settings in Simtools, increased, decreased timing, 7 bit, 12 bit rates, different versions of simtools
    It finally occured to me that in my case, the car battery with 13.8v power was the issue.
    Not exactly sure how, but I put on 2 x 12v psu, one per motor. Sure enough, problem stopped.
    Bugger me, it seems for some reason the 13.8v and or the car battery being a feed for both JRKS was the issue.
    Even though JRKS are protected to 40v, for what we are doing, and in my case, using a 12v psu per motor stopped drop outs.
    Dunno why, it just fixed it after nearly a year of confusion on my personal ride.
    Another thing to look at when working with JRKS.
    Cheers, David.
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  2. Ads Master

    Ads Master

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  3. shanothegreat

    shanothegreat Member Gold Contributor

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    My Motion Simulator:
    2DOF, DC motor, JRK, SimforceGT
    Are you saying that the Jrk's are tripping on voltage overload?

    I've been running my 2dof seat mover with a calcium 700cca car battery with a charger putting 15 to 16 volts across the teminals and no issues with drop outs.

    I did fry a couple of Jrk's by having a stray earth caused by noise suppression capacitors on a wiper motor. Prior to the smoke escaping there was a lot of erratic behavoir including drop outs and screen flicker on the displays.

    I also noticed that the erratic comms were consistent with damage done to the board. I would check any sources of back feed via any wires contacting the frame.

    Had an issue with an rc helicopter a few years ago, the tail rotor belt was electrically isolated so as to create a "Jacobs ladder," all the servos would twitch and burn out. After replacing all the servos and reading extensively about tail belt discharge the solution came in the form of a $3 can of "Mr. Sheen" anti static spray only after buying a $300 DX7 transmitter I didn't need.

    Regards
    Shane
  4. SimonUK

    SimonUK Member

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    My Motion Simulator:
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    I have 3 JRK's powered by the same car battery. No drop outs yet here! It's very important the the wires between battery and JRK are kept as short as possible!
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  5. bsft

    bsft

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    as said, it is with my personal ride. I used to have a re-wired pc psu on a car battery at the beginning for some time on earlier sims, 12v on car battery just fine.
    @shanothegreat , no I dont believe its an over voltage issue. I am just saying that it is another thing to look at if anyones JRKS are dropping out.
    As said, I really dont know , but going from 13.8v psu - car battery to 2 x 12v 40 amps psu solved a long time problem for me.
    If you have a car battery-psu and its working, dont change it.
  6. RacingMat

    RacingMat Well-Known Member Gold Contributor

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    My Motion Simulator:
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    Hi!
    Were your wires shielded?
  7. eaorobbie

    eaorobbie Well-Known Member Staff Member SimTools Developer Gold Contributor

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    My Motion Simulator:
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    Weird one , I have either ran on a 13.8v bat or an expensive 12v desktop lab power supply with no drops, yet to try the led drivers , pc psu never worked for me.
    But great you found a solution that worked for you, thanks for sharing.
  8. bsft

    bsft

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    yes, all wires were shielded. Everything was replaced.
    I had a further think, I have replaced the car battery about a year ago, before that, there was not a problem for me. Unless the newer battery is giving out higher spikes of voltage or something.
    I really have no idea, except in my case, I fixed the problem. Its just another thing to look at when solving possible JRK problems.
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