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Problem wiring a twin motor

Old 09-03-2019, 03:38 PM
  #1  
skyhawk940
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Default Problem wiring a twin motor

Built an OV-10 wired everything up and burned out an ESC! Ordered mew motors and ESC's, checked out each side separately and they worked fine. Put everything together and burned out the same side ESC! I am using a servo Y splitter between the motors (one chan). Is this maybe the problem? I believe you can't use the BEC volts from both sides so I disconnected the + and - to the splitter on one side. I am thinking about going on ch 5 or 6 with a mix to control the other motor side. Still how do I not use both BEC's? Getting tired of all the smoke!!!

Skyhawk
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Old 09-03-2019, 05:05 PM
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solentlife
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You only remove the +ve servo wire of one ESC - do not remove the -ve as well ..... the ESC needs the -ve to be the completed signal circuit ....

Just to be sure :

Connect back ALL leads in their original plugs etc.

Check each works as separate systems.

Now remove ONLY ONE +ve lead from ONE ESC Rx plug .... (I usually use a bit of tape to keep that lead clear by taping back on itself.

Now connect up both systems via the Y lead - DO NOT REMOVE ANY OTHER leads ... you should now have two ESC's working fine.

Your problem was in disconnecting the -ve as well ...

OK ... now here's the 'cracker' .... I have a number of twin models that I have NOT removed the +ve lead and actually have no problem with both BEC's feeding Rx. Its well known that Linear BEC's do not have any problem with this at all. It is the Switch Mode BEC's (commonly termed SBEC or UBEC) that can have conflict of the switch mode pulses of each BEC ... but I have 2 models with SBEC's that have no problem at all ... (I forgot about the +ve lead when installing and it was too late once done).
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Old 09-03-2019, 05:12 PM
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Wildflyer
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I have a Deuces Wild with 2 E-Flite power 25's and 2 E-Flite 60 amp ESC's are running off a Y lead with no problem. Same on my P-38. All the twins I am aware of just use a Y lead, unless they are trying differential thrust.

You said " I disconnected the + and - to the splitter on one side"
Only disconnect the positive (red) wire. The ESC needs the negative and the signal lead to work.
That might be a problem if the speed control is trying to get negative though the power lead.
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Old 09-03-2019, 05:22 PM
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ron_van_sommeren
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Don' t remove the plus/red pin completely, you may need it again in another plane.





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Old 09-03-2019, 05:26 PM
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ron_van_sommeren
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Originally Posted by skyhawk940 View Post
... wiring a twin motor ...
Not the cause of your problems, but ...

Keep the wires short battery-side whenever possible, or else install extra capacitors. All caps on/near ESC!
Keep controller(s) close to battery if possible, and extend wires motor-side. No need for extra caps, extra points of failure.
Too long battery wires can kill ESC: precautions, solutions & workarounds - RCG
Contents
  • Example Four costly controllers consecutively cremated
  • Solutions I & II, rules of thumb
  • Problem
  • Rubbish! I have no problems.
  • Capacitor type & polarity (orientation!)
  • How & where (not) to add extra capacitors
  • DIY capacitor pack pictures
  • Capacitor & pack suppliers
  • Expert/manufacturer opinions, they all say the same ... & their rules of thumb
  • Explanation, water hammer/knock analogy, theory, references, measurements
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Old 09-04-2019, 01:09 AM
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Panther
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I haven't disconnected any wires on twins and just use a Y connector. Never a problem.
In the old quadcopters using KK2.1.5 FCs the Pos (+) had to be disconnected on all but one ESC.
Not so any more with Pixhawks etc.
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Old 09-04-2019, 08:27 AM
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solentlife
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Originally Posted by Panther View Post
I haven't disconnected any wires on twins and just use a Y connector. Never a problem.
In the old quadcopters using KK2.1.5 FCs the Pos (+) had to be disconnected on all but one ESC.
Not so any more with Pixhawks etc.
It is recc'd that with Switch Mode BEC's on a normal RC model - that only one BEC be used to avoid conflict between them. This of course is not the case with Linear BEC's, where they don't conflict. In fact with Linear BEC's it can be an advantage to leave both providing Rx power.

As I mentioned earlier ... I have some models with twin ESC's that have Switch Mode BEC's and they work happily together without disconnecting one.

But thye main point for "Skyhawk940" is to only remove ONE red +ve ESC Rx connector .... nothing else.
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Old 09-04-2019, 09:10 PM
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skyhawk940
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Thanks for all the help. Got new ESC today and got everything working correctly. Found a bad battery connector on one side. Replaced and works well now. Have counter rotating props.

Skyhawk
Sandusky, Ohio
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Old 09-04-2019, 09:11 PM
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solentlife
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Originally Posted by skyhawk940 View Post
Thanks for all the help. Got new ESC today and got everything working correctly. Found a bad battery connector on one side. Replaced and works well now. Have counter rotating props.

Skyhawk
Sandusky, Ohio
Good news .... always around to help ...
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