Any failures with MMM V2 and ext. BEC? - RC-Monster Forums

**Any failures with MMM V2 and ext. BEC? -** 09.02.2008, 10:27 PM

Have the MMM V2's been burning out the internal BEC even when using an external BEC?

This would be with the red wire removed from the MMM throttle lead?

Cheers Andrew

MTBikerTim · 09.02.2008, 10:30 PM

That is how I am going to run my fifth one when I get it. Some people have smoked the whole esc but the bec failure sound far more common. My 2 I am pretty sure failed due to bec failure.

ptt81 · 09.02.2008, 10:32 PM

I've been running mine with external bec and fan since I got it, running 4s/6s no problem so far, check out my fan grill mod

http://monster.traxxas.com/showthread.php?t=435810

11:04 PM

what external BEC are you guys running ??would the CC bec work good enough ?? thanks

ptt81 · 09.02.2008, 11:04 PM

i use DE SportBec http://www.dimensionengineering.com/SportBEC.htm

BrianG · 09.03.2008, 12:21 AM

IIRC, there has been a failure or two with an external BEC. Using an external one sure can't hurt, but we are assuming it's a load issue. Maybe it isn't but simply a bad batch of switcher ICs. Anyway, it can't hurt, but just wanted to state that it may not be the end-all solution.

MTBikerTim · 09.03.2008, 01:32 AM

Quote:

Originally Posted by BrianG

IIRC, there has been a failure or two with an external BEC. Using an external one sure can't hurt, but we are assuming it's a load issue. Maybe it isn't but simply a bad batch of switcher ICs. Anyway, it can't hurt, but just wanted to state that it may not be the end-all solution.

Given that some people (ie me) seem to be able to kill them with in minutes on multiple occasions my guess is that it does have something to do with load or voltage.

Sammus · 09.03.2008, 02:13 AM

Quote:

Originally Posted by ptt81 from traxxas forum

external bec powers RX, servos, and fan so basically the esc bec is just idle (not really disable) but at least it doesn't take any load at all

This isn't true. The esc bec is still powering the brains of the ESC, thus having some load still.

ptt81 · 09.03.2008, 02:34 AM

i know that, I meant load from RX, servos and fan

Sammus · 09.03.2008, 02:54 AM

Quote:

Originally Posted by ptt81

i know that, I meant load from RX, servos and fan

No worries. I always imagined it's a faulty component that is failing even under a very light load.

BrianG · 09.03.2008, 03:07 AM

I am kinda thinking the same thing...

JaySki · 09.03.2008, 08:49 AM

Been running with a Novak BEC with no issues thus far... (Knock on wood)

luvsrc · 09.03.2008, 09:04 AM

got my two MMM v2 back and install one in my 1/8 jammin truggy without using any external BEc ran on the track with 4s and 6s lipo ,so far no problems and working flawlessly using NEU 1515 2.5 D

DRIFT_BUGGY · 09.04.2008, 05:35 AM

Quote:

Originally Posted by CRTIM

what external BEC are you guys running ??would the CC bec work good enough ?? thanks

I have been running the CC BEC with my V1 since I got it and it is still running strong

09.08.2008, 10:47 PM

got my v2 back on sat. , got it installed and decided to use a ccbec to see how long it would last , bench tested and got about 10 sec. of running and my ccbec smoked , so i went inside and took off the ccbec and put the red wire back in the plug and bench tested it , went back outside and got like 15 sec. before it was acting like it was losing signal , and then nothing...............dont know what to say except i was hoping it would last as it will snow here in a month or so and i want to run

so when i get it back from repair i am not going to bother turning on the iron , i will hook it up and see how long it lasts

oh and a side note i did leave settings at default except i changed the lvc to 13.2v