Tim Ballinger Posted April 12, 2020 Share Posted April 12, 2020 I guess start up amps might be higher on the lower voltage but your indicated value of 7.4 A makes a nonsense of that idea. interested to hear any further test results. Tim Quote Link to comment Share on other sites More sharing options...
Chris Bott - Moderator Posted April 12, 2020 Author Share Posted April 12, 2020 OK more test results. I've done my best to be consistent but half way through did notice that opening throttle very quickly could cause max current to peak higher than steady state full throttle. All results taken from Horus max/min values rather than live values at full throttle. RPM values based on a guess of number of motor poles. Rampup power 100% Low RPM protection ON No propeller. 3S - 954 RPM 12.9V 0.19A No change in RPM above idle stick. 4S - 6328 RPM 17.03V 5.07A 5S - 7857 RPM 21.43V 4.95A 6S - 9414 RPM 25.82V 5.13A Rampup power 50% Low RPM protection ON (Default?) No propeller. 3S - 471 RPM 12.87V 0.03A No change in RPM above idle stick. 4S - 642 RPM 17.03V 0.3A No change in RPM above idle stick. 5S - 7871 RPM 21.35V 4.23A 6S - 9457 RPM 25.83V 3.94A Rampup power 50% Low RPM protection OFF No propeller 3S - 4771 RPM 12.88V 3.07A 4S - 6342 RPM 16.85V 3.7A 5S - 7814 RPM 21.32V 4.23A 6S - 9547 RPM 25.56V 5.19A Rampup power 50% Low RPM protection OFF 16x8 propeller 3S - 4400 RPM 12.83V 15.99A 4S - 5614 RPM 16.42V 25.52A 5S - 6742 RPM 20.25V 35.57A 6S - 9457 RPM 25.5V 48.57A (this rpm can't be recorded correctly?) It seems to me that it's the Low RPM protection needs to be set to OFF for this application. Edit - already spotted two typos in the results - corrected now. Edited By Chris Bott - Moderator on 12/04/2020 14:09:18 Quote Link to comment Share on other sites More sharing options...
Tim Ballinger Posted April 12, 2020 Share Posted April 12, 2020 Chris , looks like you have it. So your setup qualifies for this parameter due to a low KV and 4S voltages or below. Your last set of results seem to indicate 5S was ok with 50 % ramp up and low rpm on ( ie default) but I thought you had a problem on that combination originally. Perhaps the difference was having a prop on ? Anyway good to know how to sort it when/if w meet the issue. Tim Quote Link to comment Share on other sites More sharing options...
Devon Slopes Posted July 14, 2020 Share Posted July 14, 2020 I think I have found a different set of symptoms for the same underlying problem. I was reprogramming my Neuron 40S and testing it using batteries which were partially discharged. Instead of the normal close to 20A, I was getting a current draw of only about 12A, a situation which reminded me of reading of Chris’ woes. Then I put a fresh battery on, back to 20A for about 10 seconds, and then it cut to 15A and stayed there until I throttled down. This an e-glider setup with 910kv motor and a 3S battery which, in practice gives about 7000 RPM peak. The problems seem to set in if it drops to 6500 RPM, i.e. about the same speed that Chris saw the issues. So, I turned off the low RPM protection and everything seems fine now. Are any dangers in switching it off? I wondered briefly why I had not seen the effect in the air, but I assume its because the prop unloaded to a higher RPM. But presumably if I had tried a half-used battery at the field (this is a new model so I’ve not done that yet) I would have seen the problem. So, thank-you to everyone who has contributed to the thread, I don’t think I would have sorted this out had I not seen it! Quote Link to comment Share on other sites More sharing options...
Gavin Mack Posted August 10, 2020 Share Posted August 10, 2020 might be of interest post 72 from rcmf link below neuron problem on 6s **LINK** Edited By Gavin Mack on 10/08/2020 13:14:18 Edited By Gavin Mack on 10/08/2020 13:25:12 Quote Link to comment Share on other sites More sharing options...
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