Com Port Errors, JRK, XSim3, PC?

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Re: Com Port Errors, JRK, XSim3, PC?

Postby Bruceaust » Mon 10. Sep 2012, 15:12

Well I believe I have had some success :D.
I added 100nf Caps to the motor terminals, twisted the motor power cables, then just did 20 laps and did not have one com port error.
I had one over current error (hit a wall), but had the error condition "enabled and latched" and the "limit was to low".
I changed the current limit to 25amps and now no problems (crossed fingers );)
Seems like the problem has been solved for me at least. However more testing is still required.
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Re: Com Port Errors, JRK, XSim3, PC?

Postby motiondave » Mon 10. Sep 2012, 15:19

change the current to 0, thats unlimited .
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Re: Com Port Errors, JRK, XSim3, PC?

Postby Bruceaust » Mon 10. Sep 2012, 15:25

Yeah thanks Dave, I guess I am being a little cautious.
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Re: Com Port Errors, JRK, XSim3, PC?

Postby motiondave » Mon 10. Sep 2012, 15:26

if your motors are peaking at 25 amps, raising the limit doesn't feed them much more, just reduces errors
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Re: Com Port Errors, JRK, XSim3, PC?

Postby Bruceaust » Mon 10. Sep 2012, 15:37

Is there any possibility of blowing the jrks?
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Re: Com Port Errors, JRK, XSim3, PC?

Postby motiondave » Mon 10. Sep 2012, 15:41

Bruceaust wrote:Is there any possibility of blowing the jrks?


Not really, I run my big motors at set current of 34 amps to get motion, then back it down 5% and then set jrks at unlimited , they get HOT, but have never failed. So they run about 30 amps continuous. The JRKS are rated at 49 amps for 6 seconds. Obviously Pololu would rather you not run such high current, but it works.
Heatsink and fan cooling.
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Re: Com Port Errors, JRK, XSim3, PC?

Postby Bruceaust » Mon 10. Sep 2012, 15:48

Yeah, I have heat sinks and cooling fan, and cooling fins on the motors.
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Re: Com Port Errors, JRK, XSim3, PC?

Postby yokoyoko » Mon 10. Sep 2012, 17:47

Really nice to hear you get a step forward too.

Refering to electronic noise:
- http://www.pololu.com/docs/0J15 Please read Point 9 of the document D. Grayson of Pololu gave me
- twisted pairs are in my oppinion more for applications like CAN-Bus (where the twisted pair eleminates errors in the CAN-High and Low) - for this application here I ordered 4 ferrit cores with 5,6mH to use like this: http://www.google.de/imgres?hl=de&client=firefox-a&hs=tbm&sa=X&rls=org.mozilla:de:official&biw=1280&bih=696&tbm=isch&prmd=imvns&tbnid=PmDGoV56XEX7_M:&imgrefurl=http://www.mydarc.de/do7fh/projekte.htm&docid=oB1lYFtOLfWyxM&imgurl=http://www.mydarc.de/do7fh/grafiken/bilder/currentbalun1.jpg&w=475&h=395&ei=rQhOUOy7HsixhAfd6oDwCQ&zoom=1&iact=hc&vpx=167&vpy=279&dur=1678&hovh=205&hovw=246&tx=138&ty=108&sig=116744161511239728008&page=1&tbnh=111&tbnw=139&start=0&ndsp=21&ved=1t:429,r:0,s:0,i:81 but haven't ried it yet
I want to put 4-6 windings of the wiper/jrk wires through the ferrit cores on each wire.

Anyone who knows how to calculate dimension of caps???

- on my wipers I use 3 caps of 1,0µF 63V --> these are also used by Volkswagen for the wiper (but vw uses just 2 of it)
The caps are 2x brush/case and 1xbrush/brush connected

- I was really into rc-car racing some years ago: There we got similar issues with disturbances of the motors to the 40Mhz receiver of the rc car.
this was solved similar: http://www.roboternetz.de/phpBB2/album_pic.php?pic_id=26 ---> note the smaller caps then used on wipers

- Pololu says use: 0,1 µF 50V --> the same like your used 100nF... But they also recommend elkos on Jrk input?. and nowhere is sayed what type of motor to use with this caps. (see document)

I think the current, dimension and co of the motor should have something to do with the caps to use best!? Anyone some info's on this?

I'm getting more sure -> the "usb isolator" would help solve this prob (but I can't say if this true until end of the week)
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Re: Com Port Errors, JRK, XSim3, PC?

Postby Bruceaust » Tue 11. Sep 2012, 01:02

The size of the caps on the motor is a function of the frequency of the noise tou are tring to filter out. I guess the 0.1uf has been recomended as this presents a low impedence at the frequeny the most of the noise that is generated from the motor commutator.
Yes, the ferite cores will help. I will resort to them it I have any more problems. ( hope not!) - so far so good.

Its nice to know it is dificult to fry the JRK's I will be less nice to them from now on :D
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Re: Com Port Errors, JRK, XSim3, PC?

Postby motiondave » Tue 11. Sep 2012, 01:41

yokoyoko.
I appreciate the advice you are getting from Pololu, but even David Grayson himself has said that you should discuss with the guys at x-sim.
Even he was stunned that we run JRKS at 30 amps continuous, not peak.
Plenty of us, including myself have used and destroyed JRKS over the years.
If no one else here has used capacitors for a "noise" issue, then you are welcome to try, but you are on your own.
When I ran wipers, if there was a problem with the motor being earth isolated or just a bad motor, I bought a different one and that fixed my problem with wipers.
Now I run proper motors, being these http://www.motiondynamics.com.au/worm-d ... orque.html they are perfectly isolated and quiet motors. Much better than wipers by far. Yes, they cost a bit though.
With "noise" NEVER HAD A PROBLEM!!!! Granted a shielded cable to the pots may help a bit , but "noise" is NOT a comport error problem. "noise" is more a feedback jitteryness to x-sim and slightly off motion.
I have had comport errors in the past, but that was only because I was using the front ports on my PC box, of which are connected to a cable to the motherboard. I now run USB extention cable and plug my jrks directly into the motherboard at the back. No more problem.
The other thing that caused comport errors was a lousy power supply not putting enough power into the motors and causing the jrks to crash.
And the other thing again was running big arse motors and figuring out PID issues. And then setting motion, blah, blah.

So please prove us wrong and show us capacitors work if you need to.
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