another v3 gone
 

i was running my mmm v3 today on 6s 6000mah and a neu 1515 1y
i was driving fast brakes locked and stopped the batterys unplugged so i plug them back in and poof! smoke pours from the case. berne at cc said to send it directly to the engineers. so i hope its a fluke!

oh no......wtf?????

That stinks. Literally. I really hope these are 1:1000000 things...

im scared...i have 4 v3 unit to test tonight....i will post a review..for sure:whip: but one thing cc offer a really good sevice:yes:

Not good although stuff all MMM V3's have gone compared to V2 and V1 considering there is much more V3's out there then V1 and V2's

you think?????

Well im not scared :wink:

Just Curious ....If These Failures Are The V2 With Just The Updated Firmware Or Are They The Actual new Complete V3 Units ??

This one was a V3

How the heck did your battery become unplugged from a quick stop?

Judging from your description of the accident, I think you're lucky that the battery unplugged itself initially. It sounds like some FETs were shorted (shunted?) somehow and caused the truck to slam on the brakes. I think it would've caught fire with the body on had the battery not been unplugged. Which would've been far worse since the truck was probably some distance away from you when it happened.

yeah i was lucky! i had 6 2s lipo packs in the car! that would have been a ball of fire!:surprised:

Why is it that every one of these V3 failures has been a complete torture test of the ESC?

because if its rated for it it should be able to do it

right!!!:yes:and in other post a castle engeneer said that a lot of torture test:whip: was made on the v3 and no issue at all ....

So...how many failures is this?

I think I've seen 3.

Bustitup Killed one.

Ryu James had his short on the heatsink.

and then this.

any others?

all my 4 units run very well.....30 min on each....:whip:i will run each one today...just to add runtime....its seem that more a mmm have a runtime more its seem to be reliable:lol:


but i hope that im not gona use a mmmv3 for open a beer bottle....loll

Ryu James' problem wasn't a short on the heatsink. It was excess resistance in his bullet, from the looks of the burns probably because it came halfway unplugged.

exactly

Agree with you on that. I see no reason to run everything as close to the limits as possible then wonder why it fails. :whistle:

whaaaa whaaaaaa whaaaa...you like Chocolate and I like Pistachio



I like to drive my truck while its on fire...you guys like to drive your trucks while you knit sweaters

Me and my sweater-knitting friends take offense to that! Some of the members knit far faster than you can drive!

I had a double-take on your S/N to make sure it wasn't James that posted the quoted message!

Did you say six 2s lipos in the car? Now that is just asking for trouble. How many sets of connectors did it require? And I assume you made 3 sets of 2 packs in parallel, which is the correct way to make 6s2p? I can easily see very bad radio glitches with that setup, and if the sudden stop was strong enough to unplug all of the batteries, then there definately was a flaw in securing your batteries. You can easily damage something on the esc if you pull perpendicular to the direction the MMM bullets are supposed to plug in and out, which easily could have happened.

If you were in full brake when the battery connector came unplugged, then it probably blew some FET's when that happened. Then you plug it back in and poof here comes the smoke. The voltage generated by braking has to go somewhere, without a battery to dump it into then the controller takes the brunt of it. Battery coming unplugged on a heavy vehicle during a full brake is usually bad.

gotta Agree with that one. What connectors did you use?! I have trouble taking mine off some times!!

mike, what if castle made some cool thingyy that lit up or made cool noises, or spin something durring heavy breaking.....:lol:....well i tihnk itll be cool:yes::yes:

I still find it fascinating that at least two of the 3 failures came from more demanding usage beyond the norm. I agree that an esc should perform according to(and right up to) spec, but for what everyone has gone through with the MMM V1 and V2 it's pretty wreckless to push the limits with the V3.

Well.. If I had a ton of money to play around with and simply didn't care what happened then I'd go right ahead and experiment. Is that the case here?

well I don't have a ton of money but i do have more than one truck to run and plenty of motors and mm's so I have have to answer yes to your question of seeing what it will handle right off the get go...if I only had one rig hell yes I would be more cautious for sure

Isn't the whole idea of producing a user friendly system for the general public supposed to work comfortably within it's spec? They are releasing this system in an e revo and many people new to bl will buy this and say cool it can run 6s and will run it at it's limits and I really cant blame them at all for that. CC will even warranty the esc if it blows within spec, that itself is saying something about the manufacturers stance on the issue of runnning it at it's limits. That is, it should still work at that range without blowing.

Sorry to hear your MMM's died, but it seems to me that it's just as Castle Mike has said; if a battery lead comes unplugged during braking which it appeared to, then it'll probably fry any ESC. I don't think the MMM is at fault here; sounds just like just bad luck.

This is a good point, but there is more to consider.

I hate to compair green to orange but here it goes....

The novak hv maxx has recommended gearing suggestions.....while the MMM is still untested on the e-revo. I'm sure in time Traxxas and Castle will give gearing suggestions as well. They will also probably have minimum mAh and C rating requirements for the batteries.

Right now, my opinion is that the MMM is having some failures because there has been no suggestion to correctly set certain vehicles up.

Look at the Mamba Max, and the sidewinder. They both have gearing suggestions for the more popular vehicles they are put in. In time, the MMM will too.

Would you put a pair up a sidewinder ESC with a CMS7700 and run it on 3s lipo? You shouldn't

All I'm saying is Castle has done a great job bringing us more power for less money as fast as they could. They will finish writing the manual one day. I, for one, am happy to help them write it.:yipi:

It's just I know from working with engineers in the motor industry that when releasing product to the market the spec range is always far lower than the actual limits of the product. You'd find a breaking point at say 1000kg but state the user specs to be ~600kg. If the actual limits of the MMM is 6s I'd be shocked. The limit should probably be closer to 8s. I figured this with the MM as many have ran it at 5s without issue. In other words 6s and 1515 1y Neu should not at all be torturing the esc. And yes as you stated gearing charts, motor & battery combos are also needed.

You have a point, but from my perspective, there don't seem to have been any failures related to actually overstressing the MMM. In fact, I don't think anyone's really come close to stressing it; Castle themselves have run a a 1521 1D on the MMM with 6S which is an insanely powerful and current-hungry motor, and not had a failure.

You can't really compare mechanical safety margins to electronic margins though, IMO. The MMM is designed for a maximum of 6S LiPo, and will run at that voltage perfectly every time, ignoring any other problems. Its components can handle that voltage just fine, with the FETs rated for 30V and caps for 35V, but not any higher because it they don't need to be to run 6S reliably. The input voltage will never stray above 25.2V, wheras in mechanical designs, stresses may temporarily move above its "design-strength" and you have to take material tolerance deviations into account. Castle certainly know about mechanical tolerances; when testing their motors, even the very worst samples were able to hit at least 85,000RPM before the rotors went (with others reaching over 100,000). As aresult, Castle are only rating them to 60,000.

Current-handling ability is where you need plenty of headroom, and the MMM has buckets of that. Only one person has managed to get it as high as 170F when it died, and that seems to be a serious setup error (it would appear so anyway); the MMM shouldn't even thermal until 220F.

I'm not trying to argue or anything, but that's just my opinion. :smile:

Well put Hoov! With 3 publicly reported failures on the v3, 2 of which were in extreme limit pushing platforms, I'm feeling confident that mine will do the job when it gets here. My v2 was almost 70 hours of use when it died, and the firmware update killed it.

Here's where I've got to voice my opinion...

1 of those failures was on a unit that even the folks at Castle said appeared that liquid of some sort was sucked in by the fan. If that's the case, and the liquid caused the failure, how is it related to pushing the limits of the ESC?

On the 2nd failure where the user was sort of pushing the limits, the battery connector came unplugged while he was braking. If a battery can shift enough to pull the connector free while you're driving, it's a poor setup and purely user error IMO.

So, given the facts that have been posted about those 2 specific failures, it's really hard to see how one can draw a conclusion that a setup that pushes the MMM spec limits is really causing a failure.

i talked to my engineering buddie and he said at that motor speed its like a generator, and if anything comes unplugged the energy has no where to go. it will burn it up, that is a very logical explaniton . even without the brakes. its that dang deans plug! i better make the wires longer!:oops:

i went out and re-soldered the input leads so i will not have that problem again
http://i183.photobucket.com/albums/x...n/000_0111.jpg
http://i183.photobucket.com/albums/x...n/000_0110.jpg

V3
 

I think you're wiring are too long. It will create resistance in the system and will cause your wires to run hot. Just my opinion.:lol:

Way too much wire dude.

A much better solution would be to buy batteries that are actually suited for the application. Trying to keep all of those packs in balance will be no small task.

You guys gotta remember that the majority of the MMM failures were bec related so I am not worried here. These failures dont seem bec related and could be just bad luck. I agree with hoovhartid, I dont think you can just run any combo you like and have it work successfully. Maybe you can and thats great, but motor and gearing must work together based on battery capacity and C rating. It takes a pretty intelligent person and truthful information from battery manufactures to get it right. I think 99% of the people should just be given plug and play setups. The rest of us should be on the RC-MOnster forums.