ericrw Posted March 9, 2011 Share Posted March 9, 2011 Help needed ! I've just received my 50amp esc with a 5amp ubec for my FMS Mustang. But it's not straight forward as the esc has a wire, black/red/white with a receiver plug but so has the ubec. So which one do I put in the receiver and what do I do with the other one. Eric. Quote Link to comment Share on other sites More sharing options...
Kozmyk Posted March 9, 2011 Share Posted March 9, 2011 With a separate BEC you have to remove the red connection from the ESC lead. You can cut it or just pull the pin out and tape it up (in case you want to use the integrated BEC supply later on in another application). The ESC now connects to the Rx Throttle channel only by the -ve and the Data wires. Quote Link to comment Share on other sites More sharing options...
ericrw Posted March 9, 2011 Author Share Posted March 9, 2011 If I disconnect the red wire from the ESC lead and connct it to the throttle on the receiver; it still leaves me with the lead coming from the UBEC and where do I connect that lead?? I've hopefully uploaded a photo to show the leads coming from the ESC & UBEC. Thanks Eric. Quote Link to comment Share on other sites More sharing options...
ericrw Posted March 9, 2011 Author Share Posted March 9, 2011 It's not come through but you can see the photo in "My Album" Quote Link to comment Share on other sites More sharing options...
Bob Cotsford Posted March 9, 2011 Share Posted March 9, 2011 the UBEC connection powers the receiver in any spare servo connection or dedicated power connection, and the esc connection goes to the throttle. As Kozmyk said, just disconnect the red wire from the esc plug. Quote Link to comment Share on other sites More sharing options...
Romeo Whisky Posted March 9, 2011 Share Posted March 9, 2011 I never like to cut the red wire on the ESC nor remove it from the plug in case I want to use the built-in BEC on the ESC at some later stage. So instead I remove the red wire completely from a short servo extension lead and plug that into the throttle channel on the receiver and plug the ESC lead into that - so the effect is the same as removing the red wire without actually doing it. As the RX can no longer get power from the ESC, the plug from the UBEC goes into the Battery socket on the (Spektrum) RX (or any other spare channel) to power the RX. Quote Link to comment Share on other sites More sharing options...
Kozmyk Posted March 9, 2011 Share Posted March 9, 2011 Posted by Romeo Whisky on 09/03/2011 15:18:13:I never like to cut the red wire on the ESC nor remove it from the plug in case I want to use the built-in BEC on the ESC at some later stage. If you lift the tab, slide the pin out and cover it up/tape it out of the way then there's nothing to stop you sliding it back in if you want to use the integral BEC. Quote Link to comment Share on other sites More sharing options...
ericrw Posted March 9, 2011 Author Share Posted March 9, 2011 Thanks to all . I'll follow Romeo's suggestion. Eric. Quote Link to comment Share on other sites More sharing options...
Romeo Whisky Posted March 9, 2011 Share Posted March 9, 2011 Needless-to-say the battery leads must be connected to power BOTH the ESC and the UBEC. Quote Link to comment Share on other sites More sharing options...
ericrw Posted March 9, 2011 Author Share Posted March 9, 2011 That's another good piece of advice. Thanks Kozmyk. Quote Link to comment Share on other sites More sharing options...
ericrw Posted March 9, 2011 Author Share Posted March 9, 2011 Romeo, are you saying I have to directly power the ESC &UBEC from the battery. Or is it by connecting the UBEC to the receiver connection, that will suffice?? Quote Link to comment Share on other sites More sharing options...
Tony Smith 7 Posted March 9, 2011 Share Posted March 9, 2011 Does the ESC have a BEC function? If so then you need to disconnect it's Red wire. If it doesn't, particularly if its an "OPTO" ESC, then you need to leave the Red connected. Have a look at the document .. HERE Quote Link to comment Share on other sites More sharing options...
Romeo Whisky Posted March 9, 2011 Share Posted March 9, 2011 Yes you must get power to both the ESC and the UBEC from the battery. The UBEC powers the receiver, and the ESC powers the motor. The UBEC has no connection to the motor, only the ESC has that. But by eliminating the red wire to the RX the ESC cannot give power to the RX so the UBEC powers the RX instead. That's the whole point of the UBEC. The receiver (powered by the UBEC) receives input from your TX throttle stick and gives the instruction to the ESC to turn on/off and control the power it gives to the motor. The only other alternative is to power the UBEC from a separate RX battery pack, which doesn't make much sense as you might as well use a basic small 4.8V RX battery and not use a UBEC at all. UBEC saves the need for (and weight of) a separate RX battery pack but separates the BEC from the ESC so that if your ESC failed (eg. thermal cut-out) your would still have control-surface control to do a dead-stick landing.Edited By Romeo Whisky on 09/03/2011 16:06:51 Quote Link to comment Share on other sites More sharing options...
ericrw Posted March 9, 2011 Author Share Posted March 9, 2011 I think I've got it !!!!! eric. Quote Link to comment Share on other sites More sharing options...
Romeo Whisky Posted March 9, 2011 Share Posted March 9, 2011 We just cross-posted Eric - I've added a paragraph to my last post which might help to explain the purpose and benefit of the UBEC. Quote Link to comment Share on other sites More sharing options...
David Ashby - Moderator Posted May 9, 2011 Share Posted May 9, 2011 Eric, did that all work out ok in the end? I've got the same situation with an RTF model (possibly from the same factory I suspect) and the ESC is buried away in the fuz with 2 leads sprouting out. I'm assuming it's an opto ESC with the extra ubec lead. Just wondered how you got on...... Quote Link to comment Share on other sites More sharing options...
ericrw Posted May 10, 2011 Author Share Posted May 10, 2011 David, I ended up by putting the ubec lead into the Batt/Bind aperture. of my receiver. Everything has proved to be successful and she ( Mustang ) flies great ! Hope this helps !! Eric. Quote Link to comment Share on other sites More sharing options...
David Ashby - Moderator Posted May 10, 2011 Share Posted May 10, 2011 Yep, that's great thanks Eric - seems like an OPTO ESC. Cheers. Quote Link to comment Share on other sites More sharing options...
Tim Mackey Posted May 10, 2011 Share Posted May 10, 2011 Posted by eric loakes on 10/05/2011 09:28:17:David, I ended up by putting the ubec lead into the Batt/Bind aperture. of my receiver. Everything has proved to be successful and she ( Mustang ) flies great ! Hope this helps !! Eric. Be careful of this...some UBECs can present what is effectively a short across the two outside leads....and the receiver is then put into bind mode. Quote Link to comment Share on other sites More sharing options...
ericrw Posted May 10, 2011 Author Share Posted May 10, 2011 Oh dear!! Now you've got me worried Tim. Where should the lead in question be ? Quote Link to comment Share on other sites More sharing options...
Tim Mackey Posted May 10, 2011 Share Posted May 10, 2011 Ideally in any other socket other than batt bind. However, if your BEC /UBEC has only two wires ( red and black ) then its not a problem to have it in the bind socket. Quote Link to comment Share on other sites More sharing options...
ericrw Posted May 10, 2011 Author Share Posted May 10, 2011 Then I've got a problem as there are three wires R/B/& W. There are no other vacant appertures on the AR6200 receiver. Quote Link to comment Share on other sites More sharing options...
Tim Mackey Posted May 10, 2011 Share Posted May 10, 2011 Its only an issue with a few BEC units, very often the white wire is not even connected to anything. If, after plugging it all togeher, your Rx does not enter bind mode, then you are OK. If it does, then you could simply use a Y lead on any other channel, and connect into that Quote Link to comment Share on other sites More sharing options...
ericrw Posted May 10, 2011 Author Share Posted May 10, 2011 As my receiver does not enter into bind mode, with all plugged in; I can relax. Thanks Tim. 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.
Note: Your post will require moderator approval before it will be visible.