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10-03-2011, 01:32 PM
| #1 |
| Rock Crawler Join Date: Jun 2011 Location: San Diego
Posts: 698
|  Why am I browning out?
BRXL less than 10 hours runtime 55t sport less than 10 hours runtime 7950TH lots of runtime DX3c less than 2 hours runtime What would cause me to be browning out? I probably fight a brown out 3-5 times per pack. It only happens when the front tires are all bound up, but I will suddenly lose all steering. The only way to fix it is to move the truck with the throttle, then steering comes back online. Sometimes I only lose steering in one direction, but the servo doesn't struggle it just goes silent. My servo gets hot as all ****ing hell, just about as hot as something can get which I can comfortably touch. The servo has not been upvolted. I ran the servo many hours on a Novak Rooster. Did I ruin the servo running it with such a shitty BEC for so long? I hope that is enough information for you to help me out.  I really hope it's not my ungodly expensive servo.
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10-03-2011, 02:04 PM
| #2 |
| Pebble Pounder Join Date: Aug 2010 Location: Arvada
Posts: 185
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Likely pulling too many amps with the servo. The HH internal BEC is awesome but the 7950 can pull more amps than the speed control can put out. With a 7950 you really should be using a CCBEC. The more volts you are putting into the speed control the less likely it will be to keep up with the servo as well. So if you were running 2s and moved to 3s or 4s it is harder on the speed control to properly power the servo.
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10-03-2011, 02:41 PM
| #3 |
| I wanna be Dave Join Date: Sep 2005 Location: Houston, TX
Posts: 16,952
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Another vote for an external BEC  |
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10-03-2011, 02:46 PM
| #4 |
| RCC Addict Join Date: May 2008 Location: Chicago/Bloomington
Posts: 1,505
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Yep, that be da problem. Get a CC BEC and set it for 6 volts or so.
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10-03-2011, 02:48 PM
| #5 | |
| I wanna be Dave Join Date: Sep 2005 Location: Houston, TX
Posts: 16,952
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10-03-2011, 03:24 PM
| #6 | |
| RCC Addict Join Date: May 2008 Location: Chicago/Bloomington
Posts: 1,505
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10-03-2011, 03:41 PM
| #7 |
| I wanna be Dave Join Date: Nov 2010 Location: 07456 N. NJ USofA
Posts: 8,314
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1-While the BRXL is a great ESC, get an external BEC for the power hungry servo (wire it direct) 2-What battery pack are you using, specifically, what "C" rating & mah?? You may be overworking the pack (partly due to age) which makes the situation worse. 3-A long stretch....what connectors are you using for the battery pack?? |
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10-03-2011, 04:22 PM
| #8 |
| Rock Crawler Join Date: Jun 2011 Location: San Diego
Posts: 698
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Thanks guys, sounds like I will be ordering up a CCBEC. This happens across a few different packs. A new 3S 45C 900mAh hyperion, a new 3S 35C 1100mAh elite and an old 2S 25C 850mAh hobby people. The truck acts more consistent with the 2 cell pack, so I will assume it is the BEC. |
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10-03-2011, 05:16 PM
| #9 | |
| RCC Addict Join Date: May 2008 Location: Chicago/Bloomington
Posts: 1,505
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10-03-2011, 06:49 PM
| #10 |
| owner, Holmes Hobbies LLC   Join Date: Nov 2004 Location: Volt up! Gear down!
Posts: 20,290
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Yep, the forum hit it right. The servo is just too hoss for the stock BEC, even though it is powerful.
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10-03-2011, 11:47 PM
| #11 | |
| RCC Addict Join Date: Oct 2006 Location: crawlifornia
Posts: 1,612
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When using a ccbec you should bypass the rx with the y harness, then it does not matter what the rx voltage can handle. | |
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Linear Mode
