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HelicopterMain Discussion › Goblin with CC BEC magic smoke, need help
10-12-2017 02:02 AM  61 days agoPost 1
youngbuck

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Maine

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Hey guys I'm just setting up my first 700 electric heli and I thought I had everything hooked up properly. I had it on and spooled up for an hour last night, well tonight all I did was zip tie all my loose wires to the frame and tucked everything up nice, well I go and plug my batts in and the magic smoke comes out of the BEC and the tail servo I believe. I have the cc edge hv 160 and just the cheap castle BEC.
From the directions I understood is you just splice the BEC wires right into the 8 gauge wires coming off the ESC? Is this correct? I'm trying to run two 6s packs.
Anyways I cut loose all the wires that I just tucked away and unplugged the ESC and BEC from the futaba receiver and plugged the batts in again and this time the BEC did not smoke but instantly got very hot, like within 4 seconds very hot to the touch.
The only thing I can think of is my soldering skills suck and it's a bad joint were I joined the wires into the ESC and or I got a faulty BEC. I'll add some pics and maybe you guys could tell me if I'm wired up right at least? And if a bad soldering joint would cause this? Remember it also worked fine for an hour while I set the microbeast plus up last night. Nothing much has changed except wiggling some wires around for making a neat tight wire job!

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10-12-2017 02:08 AM  61 days agoPost 2
youngbuck

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Maine

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Pixs

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10-12-2017 03:03 AM  61 days agoPost 3
EEngineer

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TX

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So, everything was working correctly with the wires all loose and not routed as neatly as you would like?

And then, you bundled all the wires neatly and then zip tied them to the frame?

And, your frame is made of CF material?

Is that correct to assume?

Logo 600SXs, 800XX, TDR IIs

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10-12-2017 03:09 AM  61 days agoPost 4
R38133

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USA

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sounds like you have a short does the tail servo still work??

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10-12-2017 03:11 AM  61 days agoPost 5
InvertedDude

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USA

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youngbuck

I got the same castle BEC rated for 20 amps. I am gonna take mine off and retire it! Gonna buy a fromeco regulator! Don't want to see my bird pile up into the ground over a $35 part.

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10-12-2017 03:18 AM  61 days agoPost 6
rcflyerheli

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Granbury, TX USA

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Looking at your wiring setup, you have the BEC getting 12s voltage. Castle does advertise it to be 12s capable, but of all the posts I have ever read about the BEC failing, I haven't ever heard of one failing on 6s, it has always been on 12s.

When they fail, they apply the 12s voltage to your receiver and servos, so I would be really surprised to hear you still have anything working. I would think a call is due to Castle to talk with them

Goblin 700, Trex 700DFC, Gaui X7, Logo 690SX, Logo 600SX; Trex 470 Trex 500
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10-12-2017 04:03 AM  61 days agoPost 7
Dawiev

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Middle East

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youngbuck I got the same castle BEC rated for 20 amps.
Please look carefully at the rating and see the actual value, based on your input voltage. I do not believe it is up to the task of driving modern servos. (in spite of this specific situation, which was likely a short)

This is not the place to save $30-40 ! It is the one single point of failure, putting your approx $ 2000 heli at risk.

Get a high-quality BEC, or at the very least use some form of redundancy, like Scorpion Bug or Ultraguard.

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10-12-2017 07:05 AM  61 days agoPost 8
InvertedDude

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USA

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Dawiev

https://fromeco-scale-avionics-llc....tions/regulator

I use this in my Top A 3d machine with 2600mah relions 8.4v.

The other machine is temporary retired until I get another fromeco relions regulator and 8.4 volts.

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10-12-2017 07:16 AM  61 days agoPost 9
EEngineer

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TX

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When you bundled and zip tied the wiring, perhaps the sharp edges of the CF frame cut through the wire insulation somewhere and created a short.

I always use some fuel tubing or Mikado "edge guard" when crossing over the CF frame edges as the wiring bundles are zip tied into position to prevent this from happening. Vibrations over time can have the CF "saw" right through wire insulation to the bare wire and cause shorts.

FWIW

Logo 600SXs, 800XX, TDR IIs

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10-12-2017 07:32 AM  61 days agoPost 10
Pistol Pete

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Seffner, FL

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youngbuck
From the directions I understood is you just splice the BEC wires right into the 8 gauge wires coming off the ESC? Is this correct? I'm trying to run two 6s packs.
Unfortunately, no.

The "recommended" way as per their installation guide is to connect BEC black negative to ESC black negative (ground to ground) and BEC red positive to any ONE red positive of a 6S battery for higher continuos current to electronics being fed.

Installation Guide

Bottom of diagram.

Mine hasnt failed on my gasser.

~~Enjoying the hobby one flight at a time~~

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10-12-2017 11:53 AM  61 days agoPost 11
youngbuck

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Maine

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Well I'm deff calling castle today on my lunch break, there instructions show two proper ways of wiring it and I did exactly what was instructed to do. I think this is Bull, i can barley Hoover a heli but I've built six or 7 birds, this is my first 700 electric and I'm ready to give up. I just purchased that torq tail servo and I'm 99% sure that it's smoked. And who knows if the bk servos are still functioning.
I haven't tested any of them, I'm just too frustrated. And I have protection on the CF frame , I did not chaff any wires.
The only thing it could be is a bad soldering joint but that would not cause this would it?

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10-12-2017 11:56 AM  61 days agoPost 12
youngbuck

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Maine

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And considering I'm somewhat new to electric, will a scorpion back up guard prevent this in the future? And those get soldered on where?

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10-12-2017 12:45 PM  61 days agoPost 13
EEngineer

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TX

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I can understand your fustration...

I thought with that particular CC Bec, that you could wire it such that you use only the "lower" stage main 6S batt to power the bec....and not both batts....

And I thought CC had a wiring diagram on their website for doing that.

It's good that no wires were chaffed....one less thing to check after the fact.

Perhaps the CC Bec fried without taking out your servos.....if so lucky, then the damage is marginalized......

I know it's not much help at this point, but that's why I like the Kontronik Esc's with their internal SBEC w/buffer batt......it may be more expensive, but the setup is more simple with less wiring, imo.....and the internal SBEC is also a dual lead type.

This electric stuff just takes some time to learn.......

Logo 600SXs, 800XX, TDR IIs

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10-12-2017 01:32 PM  61 days agoPost 14
co_rotorhead

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Centennial, CO, USA

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10-12-2017 01:52 PM  61 days agoPost 15
youngbuck

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Maine

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Ok so at this point I'm wondering where I should go from here? I'm building on a budget and even though it's a speed machine I'm obviously not going fast(I can't even forward fly yet).
So I'm thinking I need to get on helidirect and order a new BEC. So with that being said,Please help with a suggestion that can handle a 12s. Which I'm running two 6s. I also ordered two separate hook ups on eBay, so I can run my packs in series or parallel. I guess I should do some research on that too. Which one would you guys suggest for lower current so the odds that this won't happen again.
And I apologize for my ignorance, I've been in this hobby for like 8 years but I took a 4 year break. Now I'm just trying to relearn everything now and I couldn't do it without MR Ryder , this site, and ALL of you kind gentleman! Honestly you guys have no idea how much I appreciate all the help!
So now I'm wondering what BEC I should order and maybe find some backup gaurd but I don't need one the adds power if my main packs cut out, I need a device that will prevent over spikes in current and/or shorts, do they make these devices ?

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10-12-2017 02:08 PM  61 days agoPost 16
Dawiev

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Middle East

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Details of the heli and servos ?

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10-12-2017 02:17 PM  61 days agoPost 17
EEngineer

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TX

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As was mentioned in that CC wiring diagram, the less "voltage stepdown" used translates to more SBEC continuous current output. So, you don't necessarily want to run of 12S.

You have a choice....either internal or external SBEC(relative to the ESC).

If external, in your case, the you have to choose the SBEC input voltage for your specific situation.

And then the SBEC output voltage for your specific case.....as well as the output current needed by all your avionics (FBL, servos, etc.). You can never go wrong by choosing an SBEC output current that exceeds what current you think you need, so always err on the higher side.

I like to use hi-voltage servos for their greater torque and speed, so consider that also. All servos should be able to use the same voltage for ease of setup....these days.

In addition, the SBEC should have dual leads as the connectors used that plug into your FBL/Rx are spec'd at 5A w/gold plated pins.

And, you're going to have to learn to solder for best results.

Logo 600SXs, 800XX, TDR IIs

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10-12-2017 02:56 PM  61 days agoPost 18
rcflyerheli

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Granbury, TX USA

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Look at the Western Robotics Hercules Super BEC. It is 12s rated, (but I only run it (them, as I am running 4 on different birds) off 6s. They are a good choice for cancelling out back EMF spiked due to some brands of servos.

Here is the link: https://www.amainhobbies.com/wester...-hbecs7/p275316

Hope this helps.

Goblin 700, Trex 700DFC, Gaui X7, Logo 690SX, Logo 600SX; Trex 470 Trex 500
Amain Team Rep

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10-12-2017 03:11 PM  61 days agoPost 19
youngbuck

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Maine

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Well here are the details if it helps decide on a BEC.
Sab goblin speed
Scorpion ( big Ol tuna can) world speed record 4??-???
Microbeast plus
Futaba 8j with fut rec.
Torq BL 9100 hv tail
Bk 7001 hv cyclic servos
CC 160 edge hv ESC
CC BEC , ( the cheap 35$)
Thor 6s 3300 X2

So I do not believe I have the option for internal BEC, and I'm obviously taking off the cheap one and I need a decent suggestion that will handle my setup?
And Eengineer I think I'm falling you but what's the difference between a BEC and a SBEC.
I should of just bought a ESC with a built in BEC but I screwed up.
I might buy one but if not ,Who are the big companies that make 12s and 14s BECs for helis. Is western robotics any good? I was looking at there mini Hercules but I think it only goes up to 8s or 10s.
I know I prob sound like a knucklehead with all these questions but I'm trying to work two jobs , program the shops CNC, not piss off my girlfriend, and work on my heli while watching game of thrones haha. Hectic life.

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10-12-2017 04:04 PM  61 days agoPost 20
EEngineer

rrProfessor

TX

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BEC = SBEC = switching bec

The same thing

Logo 600SXs, 800XX, TDR IIs

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HelicopterMain Discussion › Goblin with CC BEC magic smoke, need help
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