When to Use a Battery Eliminator Circuit (BEC)
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- Опубліковано 28 сер 2024
- The UBEC used in this review was provided by the Amazon Store: Black Cat Shopping:
amzn.to/3iu5uRg
UBEC: amzn.to/3giCLg8
80a ESC - amzn.to/38pfqGX
40a ESC - amzn.to/2CVJle3
This video discusses use cases for deploying a Battery Eliminator Circuit device in your RC plane. There is also a how-to build a BEC splice so you can add and remove a BEC to any plane easily.
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You have a video on everything involved with electric flight. Thank you so much!
You are welcome!
Another well explained video. Well worth making to keep your plane on the safe side.
Dave has a diverse/tolerant battery powered Rx setup on his big pattern planes that is pretty trick. I'll be investigating that soon. Thanks for the comment.
Hi... Jhon..
Help me..
does the esc cable to the red receiver have to be disconnected?
and what will happen if all the esc cables to the receiver are connected together with an external ubec?
Thank' jhon
Good Job , John , I do love this video ,
Thank you and thanks for supporting the channel.
John
I am curious about knowing how you do connect and test the UBEC and run the ESC together.
So can you conclude that better to get opto esc rather than bec esc? I will use it in the wing with flight controller.
I was thinking you were going to forget about LOAD, but you finally remembered. That’s where I’ve had to install a stand alone BEC. Most that are onboard the ESC are 3Amp to maybe 5Amp. The stand alone BEC’s come in higher amperage ratings.
Also, if the ESC you’re using has a BEC, I just remove the center wire from the plug, I would leave the ground wire and signal wire. Why did you say remove both Hot and Ground and leave Signal only? Is there a reason behind that? I would think the ground going to the ESC might help keep the Signal to the ESC cleaner.
Dave, +/- connections not required when using a BEC--just signal. I made this JUST for you: ua-cam.com/video/mrl1JnlqJWs/v-deo.html Here's a thread on the issue: fpvlab.com/forums/showthread.php?445-IMPORTANT-BEC-on-ESC-and-Avoiding-high-current-system-ground-loops
Awesome video. I love the bloopers. You are human. Hehehehe.
Hahah! Yup, I am. The amount of material that winds up on the digital "cutting room floor" is staggering. I'm just glad I don't have to pay for film. Glad you liked the video. Merry Christmas to you and the family.
Hi David so you are bypassing the bec in the esc why do you do this sorry im new to electric in rc aircraft regards ray 😀
At 15:46 I have a question about holding the servo or a servo throw movement that exceeds the mechanical clearance for the servo to move .
I am talking about an m5 air dropper unit i purchased from amazon .
It is an rc cargo hook that straps onto a model and has its own remote control button . But it reaches the open hook position and chatters and grinds and then beeps and stops the servo . Push the open button and it closes nicely and huts the end of it's hook against the stop and beeps and stoos the servo . It uses the jamming brake action of a stop block that the servo cannot move or break to stop and beep . Or is that an esc beeping ? There is no way to calibrate the servo travel that i can see .
Will this keep working ?
My power battery drill will do the same thing if a screw it is trying to put in stops the drill from turning .
My question is that it closes and beeps perfect like a machine .
But opens all the way and at the end it chatters and skips gears grinding noise and then stops and beeps . Ok . My fix idea is that the gears teeth on a rack and pinion slider are grinding off at the open end . Soon if the teeth get too small it might nit catch and shut . But if i move the end stop closer towards the middle by glueing a block in its rail groove it will stop where teeth are still good and stop without chattering and grinding . ?
Definitely do not use any configuration that causes your gears to grind on the servo. Usually they have stops programmed, so I'm not sure why you're hearing this. I would suggest moving this conversation to discord for further assistance. discord.gg/jSFTASU
How many servos can be handled by a typical bec? I have an airliner which uses over 12 servos. What bec would you recommend?
Servo count doesn't matter. Current draw is what you have to calculate. How much collective current can your servos pull.
excellent content.
Glad you enjoyed it
great video. at 13:30 you say that when you connect a bec to receiver you should connect esc with signal only. I do not understand why you do not connect ground of esc to receiver.
Why do you think it's needed? Some disagree, but I believe this creates a ground loop potential and is simply not needed. Try it. If it works without the ground, why use it?
@@RCVideoReviews it is maybe technically not needed to link the gnd of Esc to receiver, but the signal is referenced to its gnd. I Think the Vcc however is the only pin to remove. After all indeed all the gnd points should be the same. Just the signal/gnd should stay together I d argue
It works perfectly with only the signal wire. If you want to connect your ground--go ahead, but it's not needed and helps nothing.
@@RCVideoReviews thanks for your explanations. your video is very great !
Good video. Would you recommend to use separate bat for fpv equipment on 500 size helicopter or it woun't bring much benefits + i get extra weight? Should I just use main bat to power everything where bec goes to receiver?
If you can get clean power to the FPV equipment, by all means...
@@RCVideoReviews I tried yesterday to run everything from one battery through a separate bec (solgered separatly from esc) and runcam shuts down during spooling up. I also read that runcam split 4 eats like 500 mah on its own). So I reinstalled second battery which will feed fpv. It is extra 180 grams but for Trex 500 it is ok), considering that it can lift extra 5 kg.
Hi. im having separate ubec of output 5v 7A. and esc with bec of 5v 2A. can i connect both esc(with bec) and separate ubec in parallel to my receiver? i want double safety just in case my external ubec fails in midflight.
Yes. As long as their voltage is the same. Watch this: ua-cam.com/video/yowcjweWkaQ/v-deo.html
@@RCVideoReviews Oh thank you so much!. im gonna add that schottky diode just to be in the safer side. sorry for being lazy to search you videos. lol😅
Great video John. One [stupid] question? I made a couple of these UBEC by pass leads. Where does the FC fit into hooking up the separate UBEC? Just want to be sure.
Thanks
Assuming we're not talking about a betaflight/inav FC, just a stabilizer, these take the place of your ESC BEC power source. You would not want to use these on bf/inav because they power everything--motors/rx/vtx etc. Those FCs get their power direct from the mains.
@@RCVideoReviews Thanks much man. Appreciate it.
In general, it is not a good idea, to power sensitive electronics and servos from the same source. The dc motors inside servos can induce significant peaks of negative voltage which may cause the supply voltage to collapse for a few milliseconds which in turn may cause micro processors to reset or transition to an unpredictable state. Especially Spektrum satellite receivers need a clean 3.3V supply.
Seems like a pretty broad generalization especially given the vast vast majority of planes and helicopters power servos and receivers from the same BEC. So I'm going to have to disagree with your generalization. Doesn't really seem to matter to basically everything I fly that does not include a dedicated power supply--namely 78"+ wingspan planes.
@@RCVideoReviews Yes, it depends very much on the circuit that is used. On some flight control boards, a buck converter is used to generate the 5V supply and a 3.3V LDO is used to generate the voltage for the MCU, gyro, and the Spektrum satellite from the same 5V supply. On those FCs a servo on the 5V rail could cause the 5V supply to drop below the voltage that is needed for the 3.3V LDO to work…
If we dumb it down to a BEC connected to an Rx powering the Rx and servos--we can avoid theoretical discussions about buck converters and LDOs. Still a *big* list of models operating in this configuration without a hiccup.
Instead of a BEC, could I just get 5v receiver power from the power distribution board?
If your configuration uses a PDB, sure. Most fixed wing configurations don't use a PDB though.
Put thicker insulation on the wires
Which wires? Why?
Hi. My rc cars ESC BEC is not working correctly. Can I use a BEC to supply power to the receiver, and still use the ESC to power motor? If yes, how? Please help. Many thanks.
In theory you can. I'd be curious to know why the BEC stopped working, but that's less critical for a car than a plane.
Anyway, all you need from the ESC is the signal wire. So remove the red/ground wires from the servo connector on the ESC to the Rx. Tape them so they can't short out.
Connect a BEC to the battery main +/-. Feed that +/- to the receiver with a servo connector.
That's it. You are effectively converting your ESC to an Opto ESC and using the BEC to power the Rx and servos.
@@RCVideoReviews
Perfect . Many thanks. Will do tomorrow.
I purchased the Hobby Power 60a esc, but those seem to be crap. When I connect the servo to the Spektrum Rx, powered by the ESC, it moves erratically as if it needs more power. I changed the ESC to a Leopard 60a and servo works perfectly. So I though about eliminating the Hobby power ESC BEC to use it. Also I was thinking about powering the Rx with just a LiFe 6.6v battery and also eliminate the Hobby power ESC bec .
Make sure your Rx and servos are ok with 6.6v. If not, you can always put a diode inline to drop the voltage to 5.5-6v. Using a battery is a pretty safe option, but then you added weight to your setup. If you look in my description, there is an Amazon affiliate link for a ZTW 10a BEC that I have in my Katana. It's very light and is performing well so far.
I've ordered some parts I needed for a redundant power setup. I'll get a video put together on that design as soon as I've tested/verified it.
@@RCVideoReviews
Yep. Spektrum Rx are up to 9v and the servo is up to 6.6v. What I don't like is the extra weight. Very true.
I will suscribe to your channel to follow up your next project. 😁
Welcome to the channel ;) My electronics are on order for the redundancy setup.
Hi Mate, " Graat Video" I Fly a Standard hobbyking RAD Jet using Nano-Tech 4 Cel 14.8 850 mah 45-90 Discharge ran flawlessly for 3 min, I Then Pluged A Turnigy 4Cell 650mah 65-130 discharge for 2.5 min Motor Coughed & Stopped followed by 1.5 Sec of Control Shutter ToTotall Servo Falier & with No Low Battery Warning [Spectacular Gut Renching first-time Crash] whats your Synopsis & Your Remady Please 😭🛩🌈 This Has Spooked Me
Tough to diagnose without more data, but it sounds like you ran the 650 out of juice.