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12-03-2008, 04:01 AM
| #1 |
| I wanna be Dave Join Date: Sep 2005 Location: Houston, TX
Posts: 16,952
|  Shutdown
I just finished building a scaler for my Dad for Christmas and have been running it outside to get some of the bugs out and there is one that is puzzling me. I built a 7 Cell 1600mAh batteries and stuck it in the truck. It will run perfectly for about 7 minutes then just stop and I only get response from the steering (and the LEDs still work). At first, I thought it was the low rating of the cells, so I built up a 7 Cell 4500mAh pack and it did the same thing in about the same amount of time. Is the ESC shutting down for some reason? I looked up the specs of this controller before I used it and everything seems to be within it's capabilities. Specs: Traxxas XL5 Waterproof ESC Integy 55T w/~17T pinion 7C 1600mAh Battery TwistedXT LED system connected to Rx Towerpro servo Have been using a Hyperion 606I for charging duties I noticed that after the truck stopped running, if I put the pack (1600 mAh) back on the charger, the starting voltage is ~9.5V. Here is the build thread of the truck if that will help any: Dad's Scale Truck Thanks! Jeremy Last edited by JeremyH; 12-03-2008 at 04:10 AM. |
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12-03-2008, 05:24 AM
| #2 |
| MODERHATER™   Join Date: Nov 2005 Location: Colorado
Posts: 10,939
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I bet you are running a Spektrum?
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12-03-2008, 05:29 AM
| #3 |
| I wanna be Dave Join Date: Sep 2005 Location: Houston, TX
Posts: 16,952
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Opps....sorry forgot to list the Rx and TX. Tx=TQ2 Rx=Traxxas 3 channel |
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12-03-2008, 05:57 AM
| #4 |
| I wanna be Dave Join Date: Jan 2005 Location: Hueytown, Alabama
Posts: 6,777
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How many mah are you putting back into the battery?
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12-03-2008, 06:12 AM
| #5 |
| owner, Holmes Hobbies LLC  Join Date: Nov 2004 Location: Volt up! Gear down!
Posts: 20,290
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I would say the BEC is getting over amped, but then you wouldn't have steering input available. Maybe the xl-5 is overheating from partial throttle use?
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12-03-2008, 06:32 AM
| #6 |
| I wanna be Dave Join Date: Sep 2005 Location: Houston, TX
Posts: 16,952
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Hummm.....I didnt feel the ESC for temp. I'll run it this evening and check the temp with my digital temp gun. Although, I have mostly been running it at full throttle...  Rockcrawler, I'll pay attention to the total input current when I charge it after running it this evening. I assumed, though, that it wasnt a problem with the battery since I had the same issue with a different pack. I have had no charging issues with my 606I....it has been charging my other batteries (mostly LiPo) without issue. |
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12-03-2008, 07:13 AM
| #7 |
| I wanna be Dave Join Date: May 2007 Location: Taylors Falls just hanging with the MNRCRC crew.
Posts: 7,843
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I'll bet it's a thermal shut down because it comes back to life it's not permanent. Have you let it sit for awhile and re-connect the same battery?
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12-03-2008, 07:30 AM
| #8 | |
| I wanna be Dave Join Date: Sep 2005 Location: Houston, TX
Posts: 16,952
| Quote:
Also, when it shuts down, only the motor is affected. The motor stops on a dime (unlike a dying battery), however the steering and LEDs continue to function properly (as expected with a dying battery). I will be getting a Sidewinder in a trade that I might just toss into this truck. I was hoping to keep the electronics simple (so that if it needs to be reprogrammed, the process is simple) and somewhat waterproof (since I cant control where he drives this thing), but I guess that just isnt in the cards for this truck. | |
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12-03-2008, 07:36 AM
| #9 |
| I wanna be Dave Join Date: May 2007 Location: Taylors Falls just hanging with the MNRCRC crew.
Posts: 7,843
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I find it hard to believe it's the battery it has to be the ESC or the motor. Let us know what happens tonight it's a interesting problem.
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12-03-2008, 07:53 AM
| #10 |
| I wanna be Dave Join Date: Sep 2005 Location: Houston, TX
Posts: 16,952
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I was just given a suggestion to check for a stuck brush. This sounds like a very possible solution to the problem....as the motor is not new. I ran it in another crawler for quite some time before I put it in this truck.
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12-03-2008, 02:49 PM
| #11 |
| Pebble Pounder Join Date: Sep 2008 Location: Scotland Neck
Posts: 163
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It is most likely the ESC shutting down on a Lipo cutoff. The Traxxas esc that I have run have the Lipo cutoff as a default setting. Check the esc manual and or the settings on the esc.
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12-03-2008, 03:51 PM
| #12 | |
| I wanna be Dave Join Date: Sep 2005 Location: Houston, TX
Posts: 16,952
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12-03-2008, 04:16 PM
| #13 |
| owner, Holmes Hobbies LLC Join Date: Nov 2004 Location: Volt up! Gear down!
Posts: 20,290
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stuck brush sounds like a good possiblity actually, don't know why that didn't occur to me.
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12-03-2008, 04:46 PM
| #14 |
| I wanna be Dave Join Date: Sep 2005 Location: Houston, TX
Posts: 16,952
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Ok, I think Ken, mudboger07, who sent me the suggestion through PM that it might be a stuck brush, nailed it! I swapped out the brushes and have been running this thing for more than 1/2 hour and everything seems to be going well. Thanks for all of the help guys! |
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12-03-2008, 06:27 PM
| #15 |
| I wanna be Dave Join Date: Sep 2005 Location: Houston, TX
Posts: 16,952
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Ok, this thing is still going strong....those brushes must have been quite bad....I notice a lot less friction in the motor now. At full throttle it used to stop within 6" after letting go of the throttle, now it rolls for about 18".
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12-03-2008, 06:36 PM
| #16 |
| I wanna be Dave Join Date: May 2007 Location: Taylors Falls just hanging with the MNRCRC crew.
Posts: 7,843
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That's good news and handy information sure hate to see a Christmas gift have a problem.   I'm sure you dad will be surprised and delighted. |
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12-03-2008, 06:45 PM
| #17 |
| I wanna be Dave Join Date: Sep 2005 Location: Houston, TX
Posts: 16,952
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Haha....yeah, I cant wait to give it to him! He is gonna love this truck!
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12-04-2008, 06:37 PM
| #18 | |
| Rock Crawler Join Date: Jan 2008 Location: Arlington, TN
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12-04-2008, 07:26 PM
| #19 | |
| I wanna be Dave Join Date: Sep 2005 Location: Houston, TX
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12-04-2008, 09:07 PM
| #20 | |
| I wanna be Dave Join Date: May 2007 Location: Taylors Falls just hanging with the MNRCRC crew.
Posts: 7,843
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Linear Mode
