tag:blogger.com,1999:blog-5343171297649866845.post7198552029608336199..comments2023-10-20T08:00:00.473+08:00Comments on LANE Boys RC: Tamiya TBLE-02S mod for LiPo cut-offLANE Boys RChttp://www.blogger.com/profile/00624539870383140160noreply@blogger.comBlogger31125tag:blogger.com,1999:blog-5343171297649866845.post-54091139194958506972021-03-22T02:39:35.963+08:002021-03-22T02:39:35.963+08:00I believe there wass an issue with the soldering :...I believe there wass an issue with the soldering : it affected the area around. I did modify 2 others with 22kOhm and a cutoff around 6.7 V. The first mod I did is going to the bin (the one doing cutoff at 7.5V) : I removed the resistor, and it seem that I do not have continuity anymore in the area next to C9. In total, I succeed for 2 mods on 4 TBLE-02S. The 2 unsucessfull mods are still working, but there is no way I achieve a Lipo cut off, so they would be only used with NimH from now on (my kids are still using NiMH, and it is fine like that). Thanks for the indications anyway, this is great mod, but I still need to work on my skills...Silver Triplehttps://www.blogger.com/profile/12868914983701096306noreply@blogger.comtag:blogger.com,1999:blog-5343171297649866845.post-69651962888385894542021-03-21T18:36:34.560+08:002021-03-21T18:36:34.560+08:0022K should be fine in theory for 6.8V shut off.
H...22K should be fine in theory for 6.8V shut off.<br /><br />How have you established that the cut-off was at 7.5V?<br /><br />If you have made the mod, put it in the car, and measured the battery after the ESC has shut off, then most likely the 7.5V you measured is because the battery has recovered once the load was removed.<br /><br />But during driving, when high currents flow, the voltage got below 6.8V hence the ESC shut off. LANE Boys RChttps://www.blogger.com/profile/00624539870383140160noreply@blogger.comtag:blogger.com,1999:blog-5343171297649866845.post-54568674034027828172021-03-21T18:18:01.866+08:002021-03-21T18:18:01.866+08:00Hello,
Did apply the mod with a 22kOhm resistor, a...Hello,<br />Did apply the mod with a 22kOhm resistor, and did obtain a LVC at 7.5V... will try with another resistor (would like to obtain a cut off at 6.6 to 6.8V, but that seems promising...Silver Triplehttps://www.blogger.com/profile/12868914983701096306noreply@blogger.comtag:blogger.com,1999:blog-5343171297649866845.post-23242195239433368092021-03-21T18:02:24.222+08:002021-03-21T18:02:24.222+08:00Hello,
I have a few TBLE-02S sitting here (all bou...Hello,<br />I have a few TBLE-02S sitting here (all bought since beginning of the year, but as they are not waterproof, I put quicrun WP1060 in my kids buggy), so I decided to modify one to give a try. I applied a 22kOhm resistor between the zone on top of C9 and the ground. Tested this morning, and I had low voltage cutoff at 7.5V, which is too high...<br />I would like to have a low voltage cutoff between 6.6 and 6.8 Volts...Silver Triplehttps://www.blogger.com/profile/12868914983701096306noreply@blogger.comtag:blogger.com,1999:blog-5343171297649866845.post-45553916817436421912020-09-19T11:47:23.061+08:002020-09-19T11:47:23.061+08:00Not sure if the ESC designs changed... are those S...Not sure if the ESC designs changed... are those SMD resistors easy to burn? Could it be that my soldering iron is too hot? I'm using a basic non adjustable soldering iron... I will try to use those brown cylindrical resistor to compare too... <br /><br />As for testing voltage across C9, where should my multimeter probe be touching? Ground point and the solder I made above C9? <br />I really appreciate your help if you have enough time... maybe a photo diagram can be a great help... Burakolhttps://www.blogger.com/profile/03437195396524456526noreply@blogger.comtag:blogger.com,1999:blog-5343171297649866845.post-66422787891651557302020-09-19T08:46:34.273+08:002020-09-19T08:46:34.273+08:00Thanks for your kind words!
I only mod'ed two ...Thanks for your kind words!<br />I only mod'ed two or three ESC and I didn't have any problem.<br />To troubleshoot, the best would be to connect the ESC to a voltage source with a known voltage (for example a lab power supply), and then measure the voltage across C9. <br /><br />This voltage across C9 is what is fed into the microcontroller, and its level determines when the cut-off should should be activated. <br /><br />What you should see is that the voltage across C9 is the same on all ESC, when supplied with the same battery voltage. I suspect that on the ESC where the cut-off is not working, the voltage will read higher.<br /><br />It is possible that Tamiya revised the ESC internals over the years, and that new models have a different cut-off system. Or it could be that the 22K resistor does not make good connection or got damaged during soldering. <br /><br />good luck with the troubleshooting, WernerLANE Boys RChttps://www.blogger.com/profile/00624539870383140160noreply@blogger.comtag:blogger.com,1999:blog-5343171297649866845.post-46426088015775368212020-09-19T08:28:13.083+08:002020-09-19T08:28:13.083+08:00Hi,
Great tutorial! I know this is a few years o...Hi, <br /><br />Great tutorial! I know this is a few years old but I recently followed your mod and was able to solder a 22kohm SMD resistor to the Ground and C9 as specified in your blog... I thought all was good... While all three ESC's still functions as it should, two of the three is not cutting off at the expected voltage (6.6V) and drained my 2s pack... <br /><br />Do you have any idea what could have caused the two modification not to work? I quadruple checked my connections and I don't see any visible short on the board... <br /><br />What I don't get is the one mod I did worked while the other two did not... <br /><br />Is there a way for me to do a trace test or do a multimeter test to check if I am getting the correct values? I have 3 more TBLE02S that I wanted to modify but if it will not work as intended, then it might not be practical... Thank you. <br /><br />Burakolhttps://www.blogger.com/profile/03437195396524456526noreply@blogger.comtag:blogger.com,1999:blog-5343171297649866845.post-41889678094811224512018-10-08T20:16:53.615+08:002018-10-08T20:16:53.615+08:00Nice work soldering the resistor on top! Thanks fo...Nice work soldering the resistor on top! Thanks for sharing!LANE Boys RChttps://www.blogger.com/profile/00624539870383140160noreply@blogger.comtag:blogger.com,1999:blog-5343171297649866845.post-82848813357954003492018-10-08T18:36:34.814+08:002018-10-08T18:36:34.814+08:00Hello,
thanks for the tutorial.
I have used a 24k ...Hello,<br />thanks for the tutorial.<br />I have used a 24k ohm resistor.<br />My measured cutoff treshold is 6.35 V.<br />I have soldered the 0805 resistors directly on 10k and 33k resistors.<br />[img]http://shrani.si/f/16/st/4cEk0LUp/img20181002161402.jpg[/img]<br />Anonymoushttps://www.blogger.com/profile/15139325511695672035noreply@blogger.comtag:blogger.com,1999:blog-5343171297649866845.post-38251461873071451672018-03-11T15:54:07.193+08:002018-03-11T15:54:07.193+08:00Great to see it was of help! We run in the local H...Great to see it was of help! We run in the local HDB car park, and sometimes meet for Touring or Trails with the SG Crawlers: http://sgcrawlers.forumotion.com/LANE Boys RChttps://www.blogger.com/profile/00624539870383140160noreply@blogger.comtag:blogger.com,1999:blog-5343171297649866845.post-18263005427727445432018-03-11T15:13:14.528+08:002018-03-11T15:13:14.528+08:00Thanks for this post guys. It's about time som...Thanks for this post guys. It's about time someone post this! Good to know this came from a fellow Singaporean! Where do you guys usually run your cars?<br /><br />GabGabrielhttps://www.blogger.com/profile/15469799607886539102noreply@blogger.comtag:blogger.com,1999:blog-5343171297649866845.post-68161817258338334842017-12-03T01:27:51.601+08:002017-12-03T01:27:51.601+08:00Thank you for the quick response. I ordered the 08...Thank you for the quick response. I ordered the 0805 size 1/8w. Anonymoushttps://www.blogger.com/profile/07179310430547186583noreply@blogger.comtag:blogger.com,1999:blog-5343171297649866845.post-15940276573051311282017-12-02T14:18:29.012+08:002017-12-02T14:18:29.012+08:00Hi! You need a SMD resistor with size "0805&q...Hi! You need a SMD resistor with size "0805". There is no power consumed in the resistor, so 1/8W or even less is fine.<br />Example: http://sg.element14.com/multicomp/mc01w0805133k/res-thick-film-33k-1-0-1w-0805/dp/9333053<br /><br />2W is much, much larger and will not fit physically in the ESC. LANE Boys RChttps://www.blogger.com/profile/00624539870383140160noreply@blogger.comtag:blogger.com,1999:blog-5343171297649866845.post-24587668127794353232017-12-02T11:24:26.765+08:002017-12-02T11:24:26.765+08:00When shopping for these resistors I see different ...When shopping for these resistors I see different values like 1/8w or 2w. What should this value be to work in the ESC?Anonymoushttps://www.blogger.com/profile/07179310430547186583noreply@blogger.comtag:blogger.com,1999:blog-5343171297649866845.post-31091620357184879632016-11-23T09:35:06.075+08:002016-11-23T09:35:06.075+08:00Have a 16k SMD resistor coming from ebay item 3319...Have a 16k SMD resistor coming from ebay item 331913215194. Looking forward to either ruining the ESC or saving me from buying a Castle SV3 :-). Thanks again. Anonymoushttps://www.blogger.com/profile/02210112421661980595noreply@blogger.comtag:blogger.com,1999:blog-5343171297649866845.post-56876396885491486652016-11-23T08:26:26.085+08:002016-11-23T08:26:26.085+08:00Sure! For 3.6V per cell (7.2V cut-off) the resisto...Sure! For 3.6V per cell (7.2V cut-off) the resistor needs to be 16KOhm (not a standard value, you could put a 15KOhm and 1KOhm in series).<br />Note that the restart voltage in that case would be 8.3V (i.e. once the voltage drops below 7.2V, it needs to go back above 8.3V to get the ESC to restart; power off/on restarts it as well of course)<br /><br />Closest standard resistor values: 18KOhm gives 6.96V, 15KOhm gives 7.38V.<br /><br /><br />Technical info to make your own calculation: The voltage is measured with a simple voltage divider. There is a 33KOhm resistor R1 on the "top" (towards the battery voltage, and a 10KOhm resistor R2 at the "bottom" to Ground (where the MCU measures).<br /><br />The MCU cuts off when the voltage across R2 goes below 1.135V. The ESC restarts when the voltage goes back up above 1.305V.<br /><br />To increase the cut-off voltage, we need to decrease the R2 resistor value. We do that by adding another resistor in parallel.<br /><br />cut_off_voltage = 1.135V * (R1 + R2) / R2<br /><br />We can calculate the needed R2 for the desired cut-off voltage (R1 remains 33KOhm), and then find a suitable value resistor to parallel the existing 10KOhm to obtain the desired R2 value.LANE Boys RChttps://www.blogger.com/profile/00624539870383140160noreply@blogger.comtag:blogger.com,1999:blog-5343171297649866845.post-80846281436532521972016-11-22T22:28:52.945+08:002016-11-22T22:28:52.945+08:00Do you know what resistor to use for 3.6v per cell...Do you know what resistor to use for 3.6v per cell? Thanks for taking the time to do all this for us! ThanksAnonymoushttps://www.blogger.com/profile/02210112421661980595noreply@blogger.comtag:blogger.com,1999:blog-5343171297649866845.post-63162407017692126082016-08-18T04:07:20.682+08:002016-08-18T04:07:20.682+08:00Okay, thank you very much! Now I understand, I tho...Okay, thank you very much! Now I understand, I thought that the 3.0V was for the whole battery and not for each cell.Anonymoushttps://www.blogger.com/profile/08926842692822551143noreply@blogger.comtag:blogger.com,1999:blog-5343171297649866845.post-71675436743863263462016-08-17T08:09:52.658+08:002016-08-17T08:09:52.658+08:00Hi! A LiPo battery cell must not be discharged bel...Hi! A LiPo battery cell must not be discharged below 3.0V. So for a 2S pack, the pack must not go below 6.0V or you risk permanently damaging the battery. The damage can be perceived in form of bloat, rise of internal resistance, and loss in capacity.<br /><br />There is anyway no gain discharging below 3V per cell, as the energy remaining below 3V is extremely small.LANE Boys RChttps://www.blogger.com/profile/00624539870383140160noreply@blogger.comtag:blogger.com,1999:blog-5343171297649866845.post-21625308964291184482016-08-17T02:44:40.031+08:002016-08-17T02:44:40.031+08:00Hi! great tutorial!
I have one question: 4.9V are ...Hi! great tutorial!<br />I have one question: 4.9V are not enough? Other esc have the cutoff at 3.8V. I would use it with a 2S 5000mha battery.Anonymoushttps://www.blogger.com/profile/08926842692822551143noreply@blogger.comtag:blogger.com,1999:blog-5343171297649866845.post-32815587013868425672016-06-15T08:11:25.815+08:002016-06-15T08:11:25.815+08:00I used a 0805 size.
0603 is fiddly to handle but ...I used a 0805 size. <br />0603 is fiddly to handle but would work too. There may be enough room to fit a 1206 but I haven't tried that. LANE Boys RChttps://www.blogger.com/profile/00624539870383140160noreply@blogger.comtag:blogger.com,1999:blog-5343171297649866845.post-43801468014322946422016-06-14T17:30:56.654+08:002016-06-14T17:30:56.654+08:00Hi, Thanks for the great tip! Before I get this st...Hi, Thanks for the great tip! Before I get this started, I just want to make sure the size of smd resister that you used. Thanks, Jangho.Anonymoushttps://www.blogger.com/profile/17512373747258984238noreply@blogger.comtag:blogger.com,1999:blog-5343171297649866845.post-53125457474276713322016-06-14T17:28:01.288+08:002016-06-14T17:28:01.288+08:00Hi, Thanks for sharing this great tip. but I just ...Hi, Thanks for sharing this great tip. but I just want to make sure what size of smd resistor you used? This would help me to get right one. Cheers.Anonymoushttps://www.blogger.com/profile/17512373747258984238noreply@blogger.comtag:blogger.com,1999:blog-5343171297649866845.post-70535073630176020462016-06-10T08:48:45.199+08:002016-06-10T08:48:45.199+08:00Hi Aly,
yes you can use a standard resistor, given...Hi Aly,<br />yes you can use a standard resistor, given you have enough space.<br /><br />If after the mod the battery is detected as empty then you may have a wrong resistor value. It should be 33 KOhms (color bands on the resistor: orange-orange-orange) or 27 KOhms (red-purple-orange). <br /><br />You could have also accidentally created a short circuit to ground somewhere, or the resistor between "Vbatt" and "measure" (refer to picture in my blog post) may be dislodged or damaged. Use a multimeter to measure what voltage you see on the "measure" point. It should be 1.3V if the battery is 6.9V.<br /><br />Good luck with troubleshooting, WernerLANE Boys RChttps://www.blogger.com/profile/00624539870383140160noreply@blogger.comtag:blogger.com,1999:blog-5343171297649866845.post-71034495021700501152016-06-10T00:53:23.094+08:002016-06-10T00:53:23.094+08:00Hello, can I use a standard resistor? Like a cylin...Hello, can I use a standard resistor? Like a cylindrical brown one. I soldered it but the esc now detects the batery as discharged and it is fully chargedalyhttps://www.blogger.com/profile/13669067974686201798noreply@blogger.com