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Author Topic: ESC & UBEC ??  (Read 401 times)

drambuidhe

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ESC & UBEC ??
« on: July 31, 2017, 11:01:52 PM »

Hi chaps,
Can I pick some brains please? I'm fitting out my ASW-28 with an F2s AP which is supposed to be directly linked to the ESC. It also links to the rx. The AP also has its own power module . I've also got a Ubec feeding the Rx. The plane has 9 servos plus a Mobius and a couple of strobes so I'm concerned that if I disconnect the + lead from the ESC feed the RX may struggle with the load.
My question is -why can't I use the ESC power too?
Cheer's ;D
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Coyote

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Re: ESC & UBEC ??
« Reply #1 on: July 31, 2017, 11:15:24 PM »

Sounds like you have 3 supplies going to the same 5v rail.

ESC 5v
Ubec 5v
Autopilots own 5v

You only need one. So the first question is this power module, does it supply 12v or 5v as well ?

What is best practice if the power module doesn't supply 5v is run it all from the correct rated Ubec only. Running from the ESC 5v supply is regarded as bad practice due to thermal shutdowns rendering the AP completely useless. This may be of less of a risk with a glider with most the time spent gliding as opposed to on throttle.

9 servos sounds very excessive ! My 2.6m composite ASW 28 only used 5 and that had panning as well :) They were standard size servos so very power hungry compared to 9 grams and I ran everything still for a 5 amp Bec so as long as yours is the same it should be absolutely fine.
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drambuidhe

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Re: ESC & UBEC ??
« Reply #2 on: August 01, 2017, 12:10:13 AM »

Sounds like you have 3 supplies going to the same 5v rail.

ESC 5v
Ubec 5v
Autopilots own 5v

You only need one. So the first question is this power module, does it supply 12v or 5v as well ?

What is best practice if the power module doesn't supply 5v is run it all from the correct rated Ubec only. Running from the ESC 5v supply is regarded as bad practice due to thermal shutdowns rendering the AP completely useless. This may be of less of a risk with a glider with most the time spent gliding as opposed to on throttle.

9 servos sounds very excessive ! My 2.6m composite ASW 28 only used 5 and that had panning as well :) They were standard size servos so very power hungry compared to 9 grams and I ran everything still for a 5 amp Bec so as long as yours is the same it should be absolutely fine.
Hi Coyote, No the power module does just 12v which will power the AP if there was a thermal shut down of the ESC I assume?
I fitted the Ubec to get a 5v supply for the camera and as back up for the rx.
The ASW has 6 servos itself plus two for the pilot arm movement and one for panning.(all 9g)
I will take the 5v pin out of the esc IF its necessary but just wondered why since its all working fine on the ground :)
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Coyote

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Re: ESC & UBEC ??
« Reply #3 on: August 01, 2017, 12:18:43 AM »

Hi Coyote, No the power module does just 12v which will power the AP if there was a thermal shutdown of the ESC I assume?
Yes the power module would still power the AP but with no 5v from the ESC there would signals going to servos that were not powered so the AP could do nothing.

Quote
The ASW has 6 servos itself plus two for the pilot arm movement and one for panning.(all 9g)

I see. Then a 5 amp Bec will be more than enough for that current draw.

Quote
I will take the 5v pin out of the esc IF it's necessary but just wondered why since it's all working fine on the ground :)

The problem with using multiple supplies for 5v is if they are switching Becs, switching Becs will clash with their outputs and fail in time, not the case with linear Becs though. That's why when building quads etc you must snip the reds from all the Becs but one so this doesn't happen.

That's why it's much easier / safer to run a dedicated standalone Bec instead.

Also remove the ground from the ESC signal wires as well ( ground loops )
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drambuidhe

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Re: ESC & UBEC ??
« Reply #4 on: August 01, 2017, 09:38:13 AM »

Thanks Coyote, I appreciate your help.
I'll remove the + and - from the esc bec then.
Cheer's :D
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iwan_canobi

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Re: ESC & UBEC ??
« Reply #5 on: August 01, 2017, 10:10:18 AM »

You can always still use the ESC BEC to power cameras or something that doesn't really matter if the supply goes down. That's what I normally do.
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drambuidhe

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Re: ESC & UBEC ??
« Reply #6 on: August 01, 2017, 05:30:54 PM »

You can always still use the ESC BEC to power cameras or something that doesn't really matter if the supply goes down. That's what I normally do.
Good idea Iwan, maybe it can be my strobe supply too. :)
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