MMM Explodes into FLAMES!

[jpoprock]

Hey Bondo... thanks for the link! I hadn't looked at that brand yet.

I was thinking of getting some of these to have when my Flightpower 3s's are charging.

https://www.hobbycity.com/hobbycity/...idProduct=8587

Maybe those aren't a great choice though. I guess I'm now scared to run 6s in my ERBE for fear of smoking the ESC. But maybe that shouldn't happen if properly geared, and maybe then I shouldn't be concerned. I'm just now all paranoid that running 6s w/ the MMM is literally like playing with fire! I shouldn't have to be worried though, esp if CC is advertising the MMM as such, but I just don't know. I'm not convinced that the MMM is a RELIABLE 6s capable ESC. Maybe it is, with the right tire and gearing combo. But then how much you brake becomes an issue, terrain, etc. I just hate having to be now be paranoid whenever I hit the brakes.

I don't want to get into a debate here... but does Tekin provide the same sort of warranty and repair that CC does? just wondering...

[Bondonutz]

Originally Posted by jpoprock

I don't want to get into a debate here... but does Tekin provide the same sort of warranty and repair that CC does? just wondering...

From what I've read about some guys experiences with their problems Tekin was right on it resolving the issues. Same great customer service as Castle

[Bondonutz]

I think running 6s is a bit excessive personally. With 4s there is more power is on tap that can be used when bashing anyway ?
I have 5 M.M.M. and a couple have had hundreds of runs using 4s with zero issues, I have several friends whom like the 5s & 6s with their trucks and these guys have problems occasionally. Usually heat issues and other minor stuff,no smoke letting (yet).
When we are out running together even though they have more power on tap they can't use it because of where we run,surface,obstacles ETC you just don't get a chance to wring it out.
The Castle ESC is a awesome affordable controller but I beleive a lot of extra care and consideration to the set up has to be made to run reliably with 6s to do it with no heat issues and do it safely. Then theres always the luck of the draw that some of these guys who run 6s might have a defective ESC, shit happens.

[TexasSP]

Originally Posted by Bondonutz

I think running 6s is a bit excessive personally.

A rather broad statement with nothing really backing it up. In a revo, yes 4s can be fine, however in heavier trucks like an LST2 it makes a world of difference. The biggest advantage to higher voltages is the ability to use lower KV motors and the ability to keep the same performance while lower amp loads.

6s in itself is fine, but people should not be using the heaviest wheel/tire combo then gearing for 60+. Then they wonder why the setup blows. 99% of the failures I see on here on 6s are setup related.

[Bondonutz]

Originally Posted by TexasSP

A rather broad statement with nothing really backing it up. In a revo, yes 4s can be fine, however in heavier trucks like an LST2 it makes a world of difference. The biggest advantage to higher voltages is the ability to use lower KV motors and the ability to keep the same performance while lower amp loads.

6s in itself is fine, but people should not be using the heaviest wheel/tire combo then gearing for 60+. Then they wonder why the setup blows. 99% of the failures I see on here on 6s are setup related.

Hence the "personally". In my LST2's I run 4s with no probs,my buds who run 5s & 6s in there LST2's have problems. It's just a general statement based on my experiences. Not rules or guide lines that anyone has to follow ?

I do agree with your 6s setup reference

[hemiblas]

I agree with Bondo. 6S really isnt required for a 45mph or below setup. I was just hoping to milk cooler temps with my 6S setups, but maybe it just doesnt matter. 4S will get me the speeds and torque I need given the MMM current handling abilities. On 4S the controller is going to get warmer than what I would like so I figured a 6S setup would be better for cooler running electronics. 5S has been the sweet spot for me for the 2200 combo in terms of temps, power and reliability. Even on 4S there is enough power on tap to shred as many RC parts as you can buy.

[Bondonutz]

One thing I forgot to mention, In most of my trucks I have 6.5" or larger tires and geared for 40-45mph and live in Fl. My ESC fans very rarely come on with 4s.

[jpoprock]

Please don't rip me for posting this thread from the TRX forum. But I thought it was worth noting.

http://monster.traxxas.com/showpost....2&postcount=44

Doesn't seem to me his setup was all that bad at all. But it seems we may not know the whole story. I dunno.

[jpoprock]

Well... maybe I'll pick up some 2s packs, or maybe stick with 3s and not worry about frying the ESC providing I'm geared to run those big tires, and about 40mph tops. That's plenty fast for what I do. The ESC shouldn't fry on 6s alone. It's got to be combo of things. In my case, I fully realize now that I was overgeared and hadn't taken that into consideration when mounting up the tires. I was just so excited to run them, that I spaced that little detail.

[TexasSP]

I really don't think people fully understand the impact tire/wheel combos have on their systems. It's not just dead weight which is one thing, it's rotational mass which has a much greater effect pound for pound in regards to stress than virtually anything else. If you are going to do speed runs (in a monster truck anything above 50) then you need to try and get the lightest tire wheel combo possible. It's not just the acceleration but the braking which greatly affects your system. Even HPI states in the Flux manual to use phaltlines when doing high speed runs.

I would also note that a thorough inspection be done of your vehicle after each run to check for binding and for any items the could be lodged in the drive train. I know for a fact both the HPI and TRX manuals state do this on all their RTR's.

As for the TRX forums, I gave up posting there. People just whine and moan when you explain to them there are limits on these systems.

I have been running 6s succesfully with a V2 MMM for a year now in my E-Revo, E-maxx 3905 and LST2 conversion.

[Sammus]

I wish people would quit posting it, that doesn't explain ANYTHING. All it does is show that you get voltage spikes under braking, not how an FET burns out when the ESC is arming.

[fastbaja5b]

This just looks like a faulty FET, nothing more. Perhaps a better FET supplier is required?

[Sammus]

Yeah... I reckon its the same as what happened to muted, plug in, arm, flame.

Theyve got some fancy new secret FETs for the MM pro, here's hoping they upgrade the FETs on the Monster... I doubt they wont, its probably the main reason they sourced the new fancy ones in the first place.

[jpoprock]

Well... I still don't have my camera to take pix of the motor. So instead, here is a screen shot of a Neu motor, and I just drew on it to represent what the coils look like.

As you will see... the wire from one of the three motor wires is what is burnt looking... and I'm guessing that can't be good. So, did the ESC cause that to happen, or did the motor fail and fry the ESC? We'll probl never know.

I called and left a message for Neu to call me back late on Friday, but haven't heard anything yet. I'll follow up on Monday I guess. I'm assuming that the motor is going to need repaired. I doubt that I'll get lucky and it not "be a big deal". I've not been able to test the motor either. I'm scared to when I get my ESC back, for fear it could smoke the ESC! I'll see what Neu says.

[suicideneil]

Remember that the motor pulls current, the esc doesnt push it, so in likely hood a phase shorted out somehow, causing the esc to fry also (nothing like trying to deliver current to a shorted piece of wire to cook your FETs)...

Is there any damage to the wire/ insulation where it enters the motor can?