jpbp200 Posted January 14, 2017 Share Posted January 14, 2017 I had a servo motor fail on my Revo and I bought replacements but I am seeing the following issue : when I connect either of the new servos up to the receiver they function intermittently. If I put full lock on and hold it they will go to full lock and then centre and then full lock again etc and keep doing this until I release the steering . The receiver light also goes from green to red to green as if the signal is being interrupted. They also do not respond accurately to small steering inputs and again behave as if there is a poor transmission signal. If I just plug in the remaining working Traxxas servo I see none of this behaviour and it all works as it should. I have tried The Traxxas servo and a new one together, a new one on its own and also the other new one on its own and the behaviour is the same. I have also tried each servo in both CH1 connections with the same result... Any ideas anyone? Thanks in advance. Quote Link to comment Share on other sites More sharing options...
Kpowell911 Posted January 14, 2017 Share Posted January 14, 2017 The Power HD Servos? Have you tried re binding your Transmitter & Receiver. Quote Link to comment Share on other sites More sharing options...
jpbp200 Posted January 15, 2017 Author Share Posted January 15, 2017 (edited) Yes the Power HD ones. When I connect one with the Traxxas servo still connected also it affects both servos in the same way. I have tried re-binding but still the same. I made video... Edited January 15, 2017 by jpbp200 Additional info. Quote Link to comment Share on other sites More sharing options...
jpbp200 Posted January 15, 2017 Author Share Posted January 15, 2017 OK, a bit more info. I have tried operating the throttle at the same time as the steering and when the red light on the Rx comes on the motor stops as well. Also when I plug both Power HD servos in the issue is a whole lot worse. It seems as though the failsafe on the RX is cutting in because it thinks the voltage is too low. This is not the LiPo LVC but the failsafe that returns the throttle to zero. I have tried disabling the LVC and the issue remains. So what's at fault here? Servos (drawing too much current?) Rx failsafe kicking in too early (not sure if the ESC dictates this or the RX itself) or ESC (really hope not as a new one is over £200)? If it is the ESC thoiugh I would hope that Traxxas would repair/replace it for free. The car is nearly 2 years old but has had less than 15 hours run time and is looked after extremely well. Any help would be appreciated. Thanks Quote Link to comment Share on other sites More sharing options...
atom3624 Posted January 15, 2017 Share Posted January 15, 2017 I would guess the battery's not up to the job / servo's pulling too much current. Is that a 4000 mAh 20 / 40C battery I see? Spec is 'not amazing' if you're using high-power systems. I'd go a minimum of 5000 mAh 40 / 80 C. Could look into battery options. This is an electric Revo? Consider bypassing the Rx powering the servos and consider a U-BEC / S-BEC. Al. Quote Link to comment Share on other sites More sharing options...
jpbp200 Posted January 15, 2017 Author Share Posted January 15, 2017 (edited) 15 minutes ago, atom3624 said: I would guess the battery's not up to the job / servo's pulling too much current. Is that a 4000 mAh 20 / 40C battery I see? Spec is 'not amazing' if you're using high-power systems. I'd go a minimum of 5000 mAh 40 / 80 C. Could look into battery options. This is an electric Revo? Consider bypassing the Rx powering the servos and consider a U-BEC / S-BEC. Al. Those are my 3S Black Magics :-) , I also have a pair of Turnigy nano-tech 7600mah 2S 40-80C but it does the same with them plugged in. Elec brushless Revo. I also upped the output voltage from the inbuilt BEC to 6v from 5.5 (using Castle Link) but this made no difference either. Edited January 15, 2017 by jpbp200 Additional info Quote Link to comment Share on other sites More sharing options...
atom3624 Posted January 15, 2017 Share Posted January 15, 2017 This is what I use on a few of my higher powered installations - solved problems instantly. Al. 1 Quote Link to comment Share on other sites More sharing options...
jpbp200 Posted January 15, 2017 Author Share Posted January 15, 2017 Thanks, I can't believe that a top of the range Traxxas model can't even run one higher spec servo without causing issues. The servo itself will work on any thing from 4.7v (from memory) up to 6.6v. I don't want to be adding a BEC though really if I can avoid it. Quote Link to comment Share on other sites More sharing options...
atom3624 Posted January 15, 2017 Share Posted January 15, 2017 I'm not saying that is 100% why, but my guess is the BEC will probably 'cure' the problem. What manufacturers have been calling 'high torque' and what we really consider high torque seem to be 2 different things. For 1/10 now I look at a minimum of 500 oz in (Savox 1230 / Bluebird H50C) but the truck will be supplied with a 150 oz in servo. Al. Quote Link to comment Share on other sites More sharing options...
Kpowell911 Posted January 15, 2017 Share Posted January 15, 2017 (edited) I ran that servo (one of them, two is uneccesary) with the stock Traxxas Radio with no issues or external BEC? I wasnt using particularly good lipo's either? Edited January 15, 2017 by Guns Quote Link to comment Share on other sites More sharing options...
jpbp200 Posted January 16, 2017 Author Share Posted January 16, 2017 11 hours ago, atom3624 said: I'm not saying that is 100% why, but my guess is the BEC will probably 'cure' the problem. What manufacturers have been calling 'high torque' and what we really consider high torque seem to be 2 different things. For 1/10 now I look at a minimum of 500 oz in (Savox 1230 / Bluebird H50C) but the truck will be supplied with a 150 oz in servo. Al. You may well be right but I would like to find he root cause if poss. I might get a BEC and try it so thanks for the advice. Something is clearly not right though. I wonder if the ESC might be a bit fried as it did overheat and shut down when the servo motor failed. The Rx could be fried also as I am guessing a load of current was going through it and it does not have any protection circuitry AFAIK. Does anyone have any advice regarding that? Quote Link to comment Share on other sites More sharing options...
jpbp200 Posted January 17, 2017 Author Share Posted January 17, 2017 (edited) So.... I bought a slightly used Traxxas 2075 servo and fitted alongside the remaining working one and there is no Rx dropout. This is really odd because I have seen plenty of videos on YT of people swapping to a single servo and not one mentions having to fit a separate BEC. Guns has also done it using the same brand and power of servo that I have used. I have emailed Traxxas..... In the mean time would anyone who owns a brushless 1/10 Revo with an MXL-6S ESC be interested in testing one of the Power HD servos for me and video the result? I will pay shipping. Thanks Edited January 17, 2017 by jpbp200 Additional info Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.