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03-18-2012, 10:20 PM | #1 |
Pebble Pounder Join Date: Mar 2011 Location: SLC
Posts: 181
| 3S issues...or just bad wiring?
I'm writing this because I'm not that familiar with the electronics of RC's. I've been reading and researching as I've been playing with this thing, but keep running into issues...and since I just moved to 3S lipos (30C 2650mAh) I have had a few issues I am clueless about. Most recent is a fried servo..I think. Let me give you a tiny bit of back story, and maybe that will help. I bought a used SCX10 9 months ago. It had an FXR, CCBEC, and was being run on NimH batteries. I started with that, and ran it a bit...then I built my own body, so I didn't run it much. Finished the body around Christmas, and ran it a little bit....everything was fine. After a comp, I found my motor was running MUCH faster in reverse then forward. After searching and learning about it, I was instructed to reverse my bell end 180*. I did that, and it ran fine...faster forward then reverse. Well I was going to try and set the timing on the motor (Integy 35T) to even out the speed. Right before I did this, I changed to 3S lipos. It ran fine with it for the little bit that I ran it. I went to "time" the motor, and in moving the plate, somehow got itto the point the plate could slide out of the motor, and when testing, I smelt burning. I though I fried the motor. Well after investigating, I fried the BEC. When I was getting ready to replace it I opened my box with the ESC, I saw that the capacitor on the FXR was blown. There was a black dust on the top of the FXR, and the Neg. pin was broken. So I replaced it. When I replaced it, I was apparently using a crappy soldering iron. I had a really hard time getting the solder to melt, and thought I fried the ESC. I still can't get the ESC to work right. The throttle doesn't seem to work. I've tried to reset it, and once it registered fine, the second the last 3 LED's flashed. I've had a hard time messing with it, cuz, tbh, I'm just not that familiar with it....so that ESC is still undone....I've wired it, put on the new capacitor and new BEC, but I'm hoping it's just some other issue. Sorry to drag this out, but I'm trying to give as much info as I can. So, I just bought another used truck. This one had an FXR and CC BEC also. I got it on Friday, and drove it a bit...it ran fine. The FXR was already set up for 3S, It was all wired, so I took the complete ESC wiring out of it and put it in my other truck to make sure the motor was still fine, rx still worked, etc. Everything worked fine. So, today, I spent a little more time finalizing the wiring in the old truck, using the new ESC/BEC. Well, it was running fine in the house...so I took it out on the lawn, and began driving it...everything was fine. I started doing circles with the steering, chasing the dog...then when I went to turn out of it, the wheels wouldn't turn. I stopped, picked it up, and now the servo won't budge. I can't push on the wheels to turn it (force it to turn) It's seized/locked up. It's a Savox SC-0252 servo. At this point I have NO CLUE what's going on. if I'm just having bad luck, or if something is wrong. I pulled the servo apart and didn't see anything wrong on the circuit board..but did smell a "burnt" smell. I could move the gears a little here and there, but when I put it back together it wouldn't budge. The ESC in the new truck ran fine. The wiring looks right (CC is wired directly to the FXR posts), he pulled the rx wire on the BEC, and only has the +, - wire going to the RX, not directly to the servo. The FXR has the red wire pulled like it should....this is the same way I set up the other FXR (the one that isn't working at all) I wired the BEC directly to the deans plug for the battery connection, but the other stuff is the same. So, I'm unsure if it's just bad luck or what is going on. It seems ever since I went to 3S, I've been having problems. The BEC's should be set up correctly...I think the one I just got was said to be set up for 6.0V, I never did set up the new one on the old truck. I do have both the Hotwire and the CC link (don't recall what it's called right now) So, with all that, the only thing that seems constant is that the battery is the same 3S, 30c 2650Mah, Sky lipo....but I now have 1 FXR that seems to not be working 100% (hopefully I can reset it and get it up and running) and now a fried servo....I assume it fried and that's why it won't move. Any ideas....I'm at a loss, and fear I'm just going to end up having my RC ignite in a ball of flame randomly at this rate. |
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03-18-2012, 10:36 PM | #2 |
Pebble Pounder Join Date: Aug 2011 Location: Gresham, OR
Posts: 146
| Re: 3S issues...or just bad wiring?
Okay a couple things here. If the servo won't turn when there is no power going to it try loosening the screws on the servo case. Sometimes if the case is too tight it will cause the gears to bind. If that doesn't work take the front cover off and inspect the gears for damage such as missing teeth and mis-alignement. You stated that "he pulled the rx wire on the BEC". The BEC shouldn't have any wires pulled from it. The only wire that should be pulled is the positive or red wire from the ESC, refer to the wiring diagram on castles website. What the BEC does is supply power to the receiver directly from the battery. So anything that plugs in to the receiver gets whatever the BEC is programmed at. I would verify that your BEC is supplying the correct voltage for your servo. The FXR on 3S can only run 35T motor or higher, that shouldn't be an issue for you, but just a heads up. |
03-19-2012, 11:26 AM | #3 |
Pebble Pounder Join Date: Mar 2011 Location: SLC
Posts: 181
| Re: 3S issues...or just bad wiring?
I've tried without the case even on..just the gears sitting exposed on the top and it still won't turn. In some of the diagrams it shows the reciever wire for the BEC being rmoved...mainly when it's hooked directly to the servo....this one was ran through the RX, and not directly to the servo...but I wouldn't think that be an issue. I did read that the FXR can only handle a 35T on a 3S, and so far that's all I've ran. Is it possible to have a bad Lipo? ALthough I would've expected the BEC to protect the servo from any issues with the battery. How do you test the voltage from the BEC? |
03-19-2012, 06:37 PM | #4 |
Pebble Pounder Join Date: Aug 2011 Location: Gresham, OR
Posts: 146
| Re: 3S issues...or just bad wiring?
Can you turn the servo by hand with the front cover off? To check the BEC you can hook it up to a castle link. If you don't have one I would think you could use a volt meter on exposed receiver pins, just be careful not to short them out. Here is the diagram you should be following. CC BEC Wiring Diagram. Notice the positive wire from the ESC is pulled, not the BEC. If yours is different from this then it needs to be changed. |
03-20-2012, 10:37 PM | #5 |
Pebble Pounder Join Date: Mar 2011 Location: SLC
Posts: 181
| Re: 3S issues...or just bad wiring?
The servo doesn't turn at all....it won't budge. I think I figured the problem. I hooked up the BEC to the CC Castlelink I have....I could never get the connection to register. Even undoing the rx wire and putting it back in, and making sure it clicked. I think the BEC is fried. There was a small black burn mark on the negative lead. The guy says it was working fine, but maybe he just never knew :shrug: Anyway, I messed with it some more, and never could get it to work...so I think the BEC was shot and I ended up frying my servo. My other problem with the 1st FXR I still can't figure out. I hooked it up to the Tekin hotwire, and reset the settings. Well it starts up fine...the beeping is there, the correct lights are flashing, however there is no throttle. I've tried putting it in the steering slot on the rx and still has no throttle. All the lights flash when I pull the trigger to get it to move forward. It makes a noise (might be the motor) a small ringing and it will go away if I mess with the throttle trim. I'm guessing I've fried this???? Does anyone know if that's what it's like when it's fried? If so, then I think I just happen to have 2 bad pieces, just on opposite setups. I think the CC BEC is fried but connected to the good ESC and the good CC BEC(it did connect to the Castlelink) is connected to a fried ESC. Is that a common symptom of a fried FXR, no throttle? |
03-20-2012, 11:26 PM | #6 |
Pebble Pounder Join Date: Feb 2011 Location: Burnaby, BC
Posts: 136
| Re: 3S issues...or just bad wiring?
if the bec is wired to the battery and/or set to higher than 5v output, you need to hook the battery up to give the BEC juice for the CC link to connect properly. That might be it, it might not. My CC link gives me one light for USB connectivity, but red on the device. Once I hooked up my battery, I got green light (and power light on the BEC), and then I could change my settings.
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03-21-2012, 03:32 AM | #7 |
RCC Addict Join Date: Jul 2009 Location: Farmington, NM
Posts: 1,026
| Re: 3S issues...or just bad wiring?
Also just to clarify, when the BEC is wired directly to your ESC you need to do the steps in order for the Castlelink to read correctly. 1: Start the software 2: Plug Castlelink into the USB 3: Plug the BEC into the Castlelink 4: Plug your battery into the ESC |
03-21-2012, 10:51 PM | #8 |
Rock Crawler Join Date: Nov 2009 Location: poteau
Posts: 996
| Re: 3S issues...or just bad wiring?
the first esc you had that the cap broke off is toast. now on to the bec, just check the power coming out of the bec with a voltmeter. no power, either bad bec, or bad connections. as for not being able to turn the servo, take the front cover off and pull the gears. check each one of them to make sure you don't have any broken teeth or anything in there that is binding things up. if everything looks good, swap in another servo.
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03-22-2012, 05:55 AM | #9 |
I wanna be Dave Join Date: Nov 2010 Location: 07456 N. NJ USofA
Posts: 8,314
| Re: 3S issues...or just bad wiring? +1, also check the servo horn/arm, I've had some cheap aluminum ones that would slide down to the servo case and bind it there. |
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