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#1
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The electrical team (and me) met today to finish installing the new control system and we ran into a problem. Our Victor 884 PWM's do not work with the on board code provided by FIRST. We were wondering if
1) Any other teams are having this problem 2) We are required to use the Jaguars this year 3) We could program the DS to use the Victors We know that everything works, because we tested a Jaguar also and it worked fine. Any information would be extremely helpful to the FEDS. Thank you, Alex Dinsmoor Team 201 Programmer/Electrical |
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#2
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Re: Problems with Victor 884
Jaguars are not mandatory, victors will still be available. Did you check the programing to see if it is set for jags or 884s? Also what do you mean by
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#3
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Re: Problems with Victor 884
Victors are legal, but I believe you must change the code to the specific speed controller (and it's set to jaguars by default) as it generates a different PWM for each type.
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#4
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Re: Problems with Victor 884
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#5
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Re: Problems with Victor 884
I know the large size is an immediate turn off, but please keep an open mind about using the Jags. The linearity and slow speed control compared to the Victors is night and day. See www.chiefdelphi.com/forums/showthread.php?t=68714 for more info on this. If you are serious about accurate controls this year make sure you make an effort to test them out.
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#6
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Re: Problems with Victor 884
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I'd guess that the problem is that the PWM cables aren't plugged in fully on the Victor. It can be quite difficult to get it in, because of the retaining features. |
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#7
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Re: Problems with Victor 884
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@trilogy2826 I will need to investigate into the jags further. Is it possible to make a tower of sorts out of two of them? I know you need a half inch clearance between them, but in order to fit them on we would need to do something along the lines of stacking to be able to have enough space. |
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#8
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Re: Problems with Victor 884
I would not stack either type of speed control. The top of the fans on both types need to be free to move the cooling air over the power devices. The size of the Jaguar is a distinct downside to using these devices in comparison. Remember that in all electronics there is a point on the temperature curve where the device just starts to do what it wants. Sometimes to the point of self destruction.
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#9
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Re: Problems with Victor 884
do the jags have a feedback for speed so that you can sync all the motors to the same speed to make sure you go straight in auto.
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#10
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Re: Problems with Victor 884
Not till CANBUS next year.
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#11
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Re: Problems with Victor 884
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Is there anything we can possibly put the jags over on a raised platform? Here is our electronics board (sorry for so so detail): http://www.chiefdelphi.com/media/photos/32126 |
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#12
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Re: Problems with Victor 884
Alex,
Normally I suggest that speed controllers be mounted near the motors they are controlling to minimize the wire runs. There is nothing in the picture to prevent you from using perf stock or a piece of lexan on the uprights across the back of the robot. Then you can mount the controllers vertically on that. Since the Jaguars have mounting holes in the sides, you can use threaded standoffs to elevate every other one and using the standoffs, rotate the elevated controllers 90 degrees to allow you to stagger them and fit more in the space. That way, no fans are occluded and the wiring is spaced out. Also, mounting the controllers so that they are front to back rather than side to side, works well too. This allows them to be mounted next to each other and touching. The wiring works better that way as well and the only drawback is getting the PWM cables attached. In your actual robot, don't forget to mark your wires and controllers. You can get 3M wire marking tape from Digikey. It is expensive (about $30 for a dispenser with all 10 EIA colors) but is well worth it when you are trouble shooting. Last edited by Al Skierkiewicz : 11-12-2008 at 09:44. |
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#13
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Re: Problems with Victor 884
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Stacking anything that tends to generate a lot of heat isn't always a good idea, but in some cases if you manage the heat other ways, it's not always fatal. One example is if it controls a small load, just a few Amps (and thus doesn't get that warm), another example is if there is natural or forced airflow that ensures good cooling. |
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#14
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Re: Problems with Victor 884
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#15
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Re: Problems with Victor 884
It was an older one from a previous year.
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