Blue smoking MMM
 

I was bored, so I went out to race.
But too bad the the new MMM replacement didn't like me:lol:

After couple of runs the car was lagging and smoke came out:rofl: First I thougt the motor is smoking, but after removing the body.....Waauuuwww lipo EC5 connector is loose from the wires:surprised:
The high current melt the soldering hahaha:lol:

Luckely my Hyperion 45C lipo is still alive.
As you can see the MMM is dead.
Also look at the capacitors one them is leaking:no:
Maybe this was the problem for smoking out.
The glue went from white to blue colour????:lol:

http://i270.photobucket.com/albums/j...r/IMG_4885.jpg
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http://i270.photobucket.com/albums/j...r/IMG_4891.jpg
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http://i270.photobucket.com/albums/j...r/IMG_4895.jpg
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http://i270.photobucket.com/albums/j...r/IMG_4900.jpg
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http://i270.photobucket.com/albums/j...r/IMG_4890.jpg

Another 6s Ripple Current victim? (looks like a 6s Lipo based on the balance connector?)

How old was the ESC?

Hope Castle looks after ya mate!

Looks like a V4 or V5 judging by the BEC coil thingy. Weird though, doesnt look crispy fried like burnt MMMs usually do- no obvious damage on the control board side..

Based on the title and the first couple lines of the original post I thought this was going to be about a nitro motor! LOL

Let's be cool, no need to use the "N" word here.
This is an adult friendly forum :-)

isnt that the MMM that you completely modified and soldered on? I see you soldered the switch traces closed. will CC even warranty that now?

I've only added some heatsink to stock bec wiring.
It is much better due the heatshrink, on stock bec wires I broke many times the bec wire.

It's strange because, because on V3 I had no problem at all!
V3 died only due a crash and missed some smd's components.

Possible problems:
The leaking condensator.
Heatsink, because glue is not transfering sufficient heat.

This the second time I am using the new MMM, after the rip V3 MMM.
O yeah I really don't care about the warranty.
I am honest and wanna share some problems to make the product better hahah:-)

What firmware did you use with it ? New firmwares (1.25 and higher) seems to produce "blue smoke" ...

The caps failed for sure, but what caused that, I don't know.

Jeff

I can't remember, but I thought one of the latest.
I will try to connect to the PC and find out the firmware version. It's kinda strange because I had no problem at all with V3. Well I have to say the V3 had a older firmware version. Because newer versions didn't work with mine DS2X and 6S Hyperion lipo.

Theory:

Poor connection on the EC5 connector which created resistance. That resistance created a voltage drop when large currents flowed which then caused lots of heat to melt the solder. That same resistance appeared to the ESC as a poor quality battery (high internal R) which increased the amount of ripple currents which stressed the caps too much and heated them up as well.

The blue stuff on the heatsink was from the explosion of an unfortunate nearby Smurf. Sad really, but they should know better.

Yeah it's possible of the problem, but...

-I am very precise when soldering, you can say control freak hahaha.

-Also why didn't it happen before with the V3 if the connection is bad.

-I didn't have any lagging power.

-Lipo was hand warm.

-And so on....hahaha:lol:

What colour smoke does firmware 1.24 and earlier produce? Pink? Yellow? Green? :whistle:

I agree whole heartily, go with a stronger connector in the future. You need a connector that can actually handle more than 70 amps continuous. The failure of the capacitors is a tail-tale indication of ripple voltage, leading to damage of the capacitors. It may have been related to inadequate batteries; but if you were running 30C+ continuous then it shouldn't have been a problem. It is highly recommended to upgrade to Dean's Ultra Plugs, Traxxas Power Connectors or 5.5mm or 6.6mm bullets; something rated for equal to or more than 70 amps continuous.

We are recommending going with a battery with a 150 amp or higher continuous discharge (IE 5000mAH @ 30C continuous). Anything less could potentially lead to an ESC failure due to ripple voltage. But a strong battery pack is useless without an appropriate connector.

Thomas Porfert
Tech Support
Castle Creations

A stronger connector? Aren't EC5 connectors rated for 120amp continuous?

Yes they are. He might of have confused them with the EC3 rating.

isent those rated for alot higher amps than original deans(lower resistance)?

Also looks like you might have soldered a BEC directly to the board and also shorted the switch directly on the board.

Both of those things "normally" would invalidate any warranty.

EC5s are huge connectors, much larger than deans & make a really nice, solid connection- I'd wager it's the bizarre setup or a cold solder joint rather than the connectors themselves; I run EC5s and have no complaints..

A poor joint, loose contact, or dirty contacts is what I was thinking when I wrote my original post. The connectors themselves seem quite robust.

EC5 are much better than Deans etc.
Also I am using high quality Hyperion 4200 mAh 45C lipo.
Please let me know about the warranty.
Thanks.

The EC5's are rated at 120A continuous amps when used with a 10awg wire and basically are 5mm bullets in a plastic case.

http://www.e-fliterc.com/Products/De...odID=EFLAEC502

A few other ratings can be found here: http://www.rchelicopterfun.com/rc-lipo-batteries.html

Of course I can't confirm or deny any of these ratings. I have to believe what I've read in several forum posts and what the online stores specify. I've never seen the EC5 rated higher or lower than 120A.

Well well I have no luck!
The motor is still working with my spare MMM ESC.
So I thought let's try on the broken MMM ESC, to bad the motor is now smoked:gasp: Hmmm I will it send for the non warranty repair. Luckely I've another nice CC 2200KV motor:-)