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Old Jan 26, 2014, 07:10 PM
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Help!
3 burnt out ubec and 1 multiwii pro

So I have no idea what is going on with my setup.

I have plugged this in and it works sometimes and sometimes there are puffs of smoke. I havent changed anything between plugging in battery.

I am using:

Turnigy quadcopter power distribution board
Turnigy multistar 30amp bec x4
NTM propdrive 35-30 1100kv / 380w motors x4
Turnigy Multiwii Pro flight controller board
Turnigy UBEC 5A
Turnigy nano-tech 2250mah 4S 65~130C Lipo

I made a connector to allow me to connect battery to quad power distribution board and UBEC 5A
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I have attached the UBEC to the battery via the custom made adapter
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I have it only attached to one of the servo connectors the other one is for accessories

I have monitored voltage from the battery at the port where it is attaced to the UBEC
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It shows 15.4 volts

from the UBEC i have it connected to one of the control ports on the multiwii pro
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here is the fried trace from the speed controller bank
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Name: multiwii pro.jpg
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here is the power distribution board
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now i plugged in the power to the distribution board then power to the UBEC
tested the motors for vibration. Everything worked fine.

unplugged.

plugged back in the same way and poof. There goes the lifegiving electronic smoke...

My question is what is wrong with my setup as i have fried 3 UBEC and now one Multiwii control board. Sometimes it works and sometimes it fries something. I havent changed anything. I have the minus wire pulled from all of the Speed controllers input to the multiwii board. Do i need to disconnect the positive wire too? Probably should have in retrospect but I was being lazy.

Could it be my adapter? It seems as though it is putting out the correct voltage.

Thanks for any assistance in this matter.

Also is anyone wanting to part with a multiwii PRO controller board?
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Last edited by avogodro; Jan 26, 2014 at 11:41 PM. Reason: Title change
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Old Jan 27, 2014, 08:53 AM
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Old Jan 27, 2014, 11:39 AM
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Not completely following your setup but:
Look like you may have the BEC outputs for the ESCs and the independant BEC both plugged into the FC.
In the picture with the burned FC trace, the trace look to be the power (center pin of ESC connectors) but these do not have the ground wire.
To not use the BECs in the ESCs both the power and ground wire must not connect to the FC.
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Old Jan 30, 2014, 12:45 PM
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Here is an example of the setup i have.
Its a crude graphic


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Old Jan 30, 2014, 12:53 PM
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Better resolution

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Old Jan 30, 2014, 01:22 PM
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Thats BALLS and its Neat , I always wondered what that would look like. I figured they would all fry at once and catch fire though.
What you need are four opto ESCs if you are going to use a dedicated UBEC.
only one source of 5 volt power can be connected to the System. It looks like you connected five.

I have your board and escs by the way. If any of them still work I would treat them like they didnt. Make a homemade wooden franken quad and use them for fun.

You can cut the + and - off of your ESC's BEC and only use the yellow signal wire. Or flip the connector around so only the signal wire is plugged in.

Same thing goes for Receivers only have one source of 5volt power
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Old Jan 30, 2014, 01:29 PM
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even with the negative wire off of all of the BECs the postive can still be grounded? (through the power from the ubec?)

I figured that is what happened but needed some confirmation.

i ordered another board.

you think the BECs are toast too?

Thanks
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Old Jan 30, 2014, 01:46 PM
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Quote:
Originally Posted by avogodro View Post
even with the negative wire off of all of the BECs the postive can still be grounded? (through the power from the ubec?)...
Not understanding you but from your last image, what I think is wrong is that you cut the black wire on the ESC servo lead. It's the red wire that needs to be cut.

In this image I made it a little more obvious that the large black and red ESC wires plug into your power distribution board.

You might also try powering the receiver from the BEC, as I have shown in the image, but that might not be completely necessary.

Your last image also shows 5v on the BEC jumper selected but the BEC on your quad appears to be set to the 6v jumper location. So you'll want to make sure your board can handle 6V. I don't think your receiver can handle 6v so if you stay will 6V I wouldn't connect the BEC directly to the receiver as I have shown.

On your "adapter from battery" you appear to have an open connection but for what? I would put some type of regulator between it and what ever you try to power from it.
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Last edited by RCvertt; Jan 30, 2014 at 02:33 PM.
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Old Jan 30, 2014, 03:04 PM
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yes even with the negative wire removed the BEC output is grounded to the common. So your positive wire found a ground
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Old Jan 30, 2014, 03:20 PM
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The other part of the y connector that i made isnt hooked to anything. I figured if i was going through the trouble of making an adapter i should make it with some sort of expandinility. I was going to just plug the voltage monitor to it or some navigational lights...

That is a file photo of the ubec. Mine has jumper on 5v.

I have a replacement board. Should i replace the multistar speed controllers too?

Thank you.
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Old Jan 30, 2014, 03:40 PM
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Sound like you have it sorted out. If those ESC's didn't release the magic smoke and they perform well after you run a battery or two through them while hovering low over some grass, then I say they are good. It's a 50/50 chance of new china ESC's working so you take the risk either way.
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Old Yesterday, 09:26 AM
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I'm still having trouble with this. I am confused as to the port settings could you give me a little more info?
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Old Yesterday, 09:29 AM
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Just to add I am confused as to the power arrangements. I understand I need to give power to the receiver from a BEC etc. I a not sure of the reciever output line should be connected to the controller?

I am giving power to the control board via one of the esc BEC.
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Old Yesterday, 10:15 AM
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Wrong thread soz!
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