MGM Low Voltage Cut Off - Owners READ

[jhautz]

Tne only bad part of te solution being new software is that in order to update a MGM it needs to be sent back to them. Its not like the Mamba where you can just download and install your own software update.

[bdebde]

Originally Posted by jhautz

Tne only bad part of te solution being new software is that in order to update a MGM it needs to be sent back to them. Its not like the Mamba where you can just download and install your own software update.

It should be doable with the PC software, USBcom and cc_02 cable, there is an option in the controller software. If only they would give us the updates for download.

Originally Posted by bdebde

It should be doable with the PC software, USBcom and cc_02 cable, there is an option in the controller software. If only they would give us the updates for download.

Ya, they definitely could do it, it’s a question of them wanting to. I would require them updating the PC software to allow it.

[mkrusedc]

BashOn sorry I got that backwards. I just checked. It does not cutoff with reduce RPM but does with the hard cutoff.

That sucks BashOn sorry to hear that..... my mgm is still going, only gripes are the dang brakes engaging when I let off throttle making it flip at times on lid in street :(... I was testing the lipo on cutoff setting and mine never seemed to make batts dip below like it has with others causing studdering lvc problems etc, I am running maxamps 2s and 3s 8000mah in series and I had my accel at .012 too ....

Seems the software/firmware in the MGMs are a bit dodgy. Will check out my new build tonite and report back findings if any. *Fingers Crossed*

Would 'reduce RPM' be a temporary fix for this issue instead of using 'cut-off'?

Originally Posted by fkadir

Would 'reduce RPM' be a temporary fix for this issue instead of using 'cut-off'?

For some the Reduce RPM setting is a solution. For me the reduce RPM setting reduced the RPMs even with a full pack. I had good punch, but little top end power. On cut off it would do just that and cut off on anything over around 1/3 throttle. Race mode seemed to give full power, though I never actually got to drive the truck in this mode. I only tested race mode while holding the truck off the ground. In race mode I got about 3000 more peak rpm versus the other modes.

Went for an initial run about 2 hours ago and got the same symptoms as you. The Motor will stop accelerating and cut out at about 1/2 throttle if i jab the throttle fast, I need to slowly accelerate for it not to cut off power. This is with using the flightpower 25C 5000mah battery so I dunt think quoality of battery packs should come into play.

seems like the cut-off algorithm is super sensitive or wrongly calibrated?

Originally Posted by fkadir

Went for an initial run about 2 hours ago and got the same symptoms as you. The Motor will stop accelerating and cut out at about 1/2 throttle if i jab the throttle fast, I need to slowly accelerate for it not to cut off power. This is with using the flightpower 25C 5000mah battery so I dunt think quoality of battery packs should come into play.

seems like the cut-off algorithm is super sensitive or wrongly calibrated?

Yup, we had the same problem. Maybe MGM had a bad batch, even though we actually have different models.

I assume you were on cut off mode? Did you try reduce RPM?

Yup, on cut-off mode. Didnt try the Reduce RPM mode yet, will try it tomorrow.

I dunt know if MGM will actually do something about it, but wats the workaround to this issue? An external LVC and set the MGM to race-mode?

[bdebde]

Originally Posted by fkadir

Yup, on cut-off mode. Didnt try the Reduce RPM mode yet, will try it tomorrow.

I dunt know if MGM will actually do something about it, but wats the workaround to this issue? An external LVC and set the MGM to race-mode?

An external LVC and set the MGM to NiMh-mode, then you still have the over current protection

Found a nice LVC : http://www.dimensionengineering.com/CellShield.htm

Whatch out, your LVC don't work for car use:

CellShield is intended for aircraft with 0-100% style one direction only throttle. A future product will be aimed at cars.

Good catch. I guess Mike's Li-Saver is the best for our use. :)