Need A Response From Patrick @ Cc

[phatmonk]

Wow I updated both my MMM v2s and have run 1 of them and had no problems.But that might be a problem.Is Thomas from CC in his new thread about the failures asking what software version people are running.

[jhautz]

Could just be coincidence, but it just struck me funny that they both went right after the software upgrade is all.

[DRIFT_BUGGY]

Run it, has better throttle and no issues

[pasan]

Just came back from running both my MMM powered E-Revo and MM powered E-Maxx, on 6S and 4S respectively. You're right about better throttle response, I tested this out on the E-Maxx and cogging is a lot less apparent on the 7XL. I didn't see any noticeable operating difference in the E-Revo but then I pretty much drive that thing like a 'tard anyway (why else would we run those things on 6S? :D) how ever, the motor seems to run quite a bit cooler now, and the ESC fan didn't nearly operate as regularly as it used to.

[e-mike]

Originally Posted by pasan

and the ESC fan didn't nearly operate as regularly as it used to.

me too ive noticed that...i have 5 unit(v3)and the fan come to life at 95F and for a other one unit the fan begin to spin at 125f!!...(both esc had exactly the same set-up)why?????

[Pdelcast]

Originally Posted by e-mike

me too ive noticed that...i have 5 unit(v3)and the fan come to life at 95F and for a other one unit the fan begin to spin at 125f!!...(both esc had exactly the same set-up)why?????

Well... several reasons. 1st, the calibration routine for temperature is run on the very first power-up of the MMM (which is at our lab in Kansas) -- but the temperature can vary by a few (maybe 5) degrees in the lab (depending on if its a hot day, or a cold day outside...)
2nd, the temperature sensor itself has a few degrees of tolerance.

That's why we set the temperature to a fairly low turn-on temperature. The MMM can run up to 120C (250F) on the heat sink during normal running with no issue at all, and can run up to 200C chip temperature (close to 400F) before any real internal damage starts to happen. We often reflow the solder on the transistors during extreme power testing, (where the solder becomes liquid under the transistors) and in most cases the MMM just keeps right on working normally (until the processor clock shuts down... that happens when the processor internal temperature gets to about 180C -- but that can take a few seconds for the heat to conduct to the processor core. If the processor shuts down, everything just cools off and it restarts a few seconds later, with no issues.)

For production units, we set the shutdown temperature (thermal) at about 90C-100C (about 195F-210F.) I haven't heard of anyone (yet) thermalling a MMM. (let me know if I'm wrong about that!)

[e-mike]

Originally Posted by Pdelcast

Well... several reasons. 1st, the calibration routine for temperature is run on the very first power-up of the MMM (which is at our lab in Kansas) -- but the temperature can vary by a few (maybe 5) degrees in the lab (depending on if its a hot day, or a cold day outside...)
2nd, the temperature sensor itself has a few degrees of tolerance.

That's why we set the temperature to a fairly low turn-on temperature. The MMM can run up to 120C (250F) on the heat sink during normal running with no issue at all, and can run up to 200C chip temperature (close to 400F) before any real internal damage starts to happen. We often reflow the solder on the transistors during extreme power testing, (where the solder becomes liquid under the transistors) and in most cases the MMM just keeps right on working normally (until the processor clock shuts down... that happens when the processor internal temperature gets to about 180C -- but that can take a few seconds for the heat to conduct to the processor core. If the processor shuts down, everything just cools off and it restarts a few seconds later, with no issues.)

For production units, we set the shutdown temperature (thermal) at about 90C-100C (about 195F-210F.) I haven't heard of anyone (yet) thermalling a MMM. (let me know if I'm wrong about that!)

thanks....pdelcast...now i know whyim reassured

[pasan]

I ran the truck again today, and the fan definitely comes on a lot later, and the MMM is quite warm to the touch before the fan comes on. I haven't any kind of thermometer to properly verify the temps, however I'm adamant that the unit runs warmer for longer before the fan spins up. Might this be a sign of a failing fan/thermistor?