UBEC Smoking - RC-Monster Forums

giftacrylic · **UBEC Smoking -** 07.05.2006, 07:22 PM

Why is my UBEC smoking? I am replacing one (that had the same problem). I removed the blk jumper on my 12120, so that is not the problem. Ran w/ reciever pack and it seems fine.

I checked my wires and they seem fine..Plz help...

Sylvester · 07.05.2006, 07:28 PM

Maybe faulty ubec? Has it been through any hard damage? You should get a free replacement since it has a 1 year warranty on manufactering defects. Did you say its your second smoked ubec?

giftacrylic · 07:43 PM

Yes, I smoked one last week. I think that it has something to do w/ my truck. My throttle starts to act erratically and the UBEC gets hot and starts to melt the white shrink wrap.

I also noticed that the 2 caps (silver ends) on the positive side of my 12120 are not flat, they are pushed out slightly.

Sylvester · 07.05.2006, 09:41 PM

EEK! You popped 2 caps on your 12020 than! That results in a hot ubec. You gotta send that thing to mike so he can replace it.

giftacrylic · 07.05.2006, 10:05 PM

What would cause the caps to pop? The controller never got hotter than 125.

Sylvester · 07.05.2006, 10:25 PM

Well, either the caps were overheated or bad from the start, any water go on them?

BrianG · 07.05.2006, 10:29 PM

Caps also expand from a voltage higher than its rating. They can also expand with reverse polarity, but they usually full pop from that.

squeeforever · 07.05.2006, 10:47 PM

I would think that the smoke is from the UBEC grounding out which could also cause the caps to pop or swell. Is it on a aluminum chassis?

giftacrylic · 07.06.2006, 02:35 AM

Yes it sits on an al. chassis, but I have plenty of pading and I know that it is not touching.

neweuser · 07.06.2006, 02:27 PM

I had a ubec do the same thing. Do you have a switch in it?

giftacrylic · 07.06.2006, 04:47 PM

No switch. What was your solution?

neweuser · 07.06.2006, 04:55 PM

Well, the reason i asked is because when i wired my switch in the last time, i think i had a bad connection after that. I cured everything by replacing the switch, ubec, and redid my connections all over. And now i can go far away and it's smooth runnin. But i took my time on everything and double, then triple checked everything again! Yanked and pulled and inspected each solder joint. I would say some thing with yours is wired wrong, or bad connection somewhere. UBEC are finiky it seems. Oh, and i took it off my chassis all together! I mounted it on the side of my receiver box.

coolhandcountry · 07.06.2006, 06:10 PM

Try to make sure your batteries are not touching the chassis. I did that and smoked ubec and the caps on the esc.

giftacrylic · 07.06.2006, 07:07 PM

The batts are not touching and all of my wires are double insulated so it won't touch accidentally.

Today I ran through a pack of batts using a reciever pack and everything worked fine. Maybe it was my soldering, who knows.....but I did get 25-30 runs w/ the first ubec that fried. The second ubec fried within the first 5 minutes of the run.