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Possibly Ruined All Four Jaguars
Through a series of unfortunate events, our jaguars controlling our CIM motors were wired incorrectly. V+ and V- was inserted into M+ and M- and vice versa. So the robot went crazy when we simply flipped the switch to turn it on. One jaguar caught fire internally. (Which we initially attributed to metal shavings).
When correctly wired, the jaguars still allow current to pass through them when their is no signal present, effectively landing us in the same situation were we had them wired incorrectly. In addition, two more jaguars had their magic white smoke leave them. In hindsight, with current running in the opposite direction unimpeded, plus the white smoke (and fire), I think all of 4 jag's connected to the CIMs are ruined, even though they still power up.
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Re: Possibly Ruined All Four Jaguars
All are fried.
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Re: Possibly Ruined All Four Jaguars
There is little chance of being able to fix them if they started on fire or started smoking.
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Re: Possibly Ruined All Four Jaguars
first of all. you need new jaguars. thats for sure.
here we have 2 fried jaguars. but we were able to get few from a team that not playing this year. know if you have a good electronics equipment (one of our sponseres have that). you can use the exact electrical digram (you can found them on the jaguar website). and then to find the exect "burned" chips.... we have done that. and we found out that it will cost us only 8$ to replace those parts (wich is 10% from the price of a new jaguar). the only bad part is that it will take the new chips up to 16 weeks to get here so we will have more working jaguars for next year :-) |
Re: Possibly Ruined All Four Jaguars
Bad news.
But, has everyone on the team learned to pay attention when connecting wires now? I hope so. It's an expensive lesson to teach. :eek: |
Re: Possibly Ruined All Four Jaguars
Also, we've learned the hard way to be carefull about going full forward to instantly full reverse on the drive system. We blew all four of our Jaguars when our programmers decided to "stress test" the robot before they had ramping code included. We did indeed find the week spot in the chain...the Jaguars.
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Re: Possibly Ruined All Four Jaguars
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On a related note, though, at Champs a couple years ago we had some "ghost" in our drivetrain where if we didn't do ramping code we'd brown-out the entire electrical system. Then again, we were using Victors and not Jags, but I don't blame the Victors - we literally swapped out every electrical component (except the motors) and never got rid of it. -Danny |
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Expensive mistake, but no team I have ever been on has ever repeated it. every electrical board gets inspected twice (at least) before being turned on. I think the jags are done for, unless you do as reuven suggested in which case you could probably fix them (especially if you have an EE mentor). I wouldn't consider them "competition worthy" if I were you, but they are definitely worth the effort. |
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wow, what wheels were you using, we have a pretty vicious gear ratio and we break traction and slide before we stall anything. we are 12.34 - 1 with 6 inch traction wheels. |
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Two years ago we killed two Jaguars doing nothing we could place. After working with the Luminary Micro guy who was on-hand at FLR for over an hour, I finally just said "Switch to Victors. They work!" We did, and they did.
We're using Jags for our drive this year in the hopes that they do a bit better and the first generation, but at the least sign of trouble we're switching to Victors. |
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Our problems were probably two-fold. Do the black wires in the power distribution board go to a "common ground"? The Jaguars were also hooked up to the board rather indiscriminately. The V+ and V- did not come from the same 40 AMP breaker. |
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