mgm 16018, is this normal?
 

I have found 2 things that seem odd and wanted to see if this behaves the same for others...

1. When I have the LVC set to shut down once the lipos are low, I notice that the truck will start to cut out as I drive it after about 10 minutes. To confirm this setting causes this, I changed the setting to reduce speed, and the cutting out goes away.

If I put them in my rustler, the lipos will run another 15 - 20 minutes. When I put a voltage meter on them, the 2S was at 7.68 Volts, the 5S was 11+.

I use MaxAmps 6000 & 8000.


My thought is that under load the voltage may be dropping below the LVC point, and it causes it to cut out.


2. The brakes are strong, I have them set to the softest point, but when I use them, I have to move the throttle really slow. I also set the end point on the radio to 60%.

It doesn't seem to be proportional, I wonder if I should re-program the radio?


Anyone seeing the same things?

1. Sounds familiar, based on other peoples experiences.

2. Can you adjust the low throttle end point (or reverse end point)? I can do that on my laser 6 radio to give really soft brakes on the Hvmaxx. Something like that might help....

1. Thanks

2. Ya, I did that, I set the end point to around 60%. that does help some. I found it odd that it seems to do full brake as you move the throttle forward.

I'm having the same problem with the LVC. It starts to cut out and the packs will read around 3.8 per cell or so.

anyone care to decipher this excerpt from the MGM manual ?

Specifically, this bit....

Is that saying it will take the pack all the way down to 4v regardless of the number of cells ? OUCH! I think I will be ordering a LVC.

J.

What brand lipo's are you running?

When you select Race Mode, it does turn off LVC, so it is not recommended.

I run 2 maxamps 2s 5k's in series for 4s on my e-savage. I planned on picking up some neu batts soon, or some flightpowers.

J.

Yep, it will stop functioning at 4v, with no cutoff prior to that. This would be a good option if you used an external cutoff device.

One possible reason for the cutting out when set to "motor cutoff" (hard cutoff) could be a combination of long wires and connectors, assuming the battery can stay above the LVC point. BTW, the LVC cuts at 3.2v/cell.

Have you checked this? MGM told me that it was 3.1v/cell, but I suspect it may be more.

A while back I did some testing of my own. Maybe it was 3.1v/cell that I came up with. It's been a couple years.

It's very funny to read:whistle:i've a brand new MGM 16018, never try it yet, and i'am thinking to sell it and buy a Quark:whistle:

What's the problem with high end ESC????? I realy think that the MM is the better ESC on the market. I preffer little cogging to this fu.... LVC who kick in too soon:neutral:

Novak make a LVC for 4s lipo, i think part number is NOV5071, but realy not certain of it.
Is somebody ever try it?
Novak claim that this unit stop the motor when batterie reach 12.5 volts = 3.125V/cell.
Maybe the MGM program in race mode pair with this LVC device could be a solution.

I'm going to try a diff brand lipos, PolyQuest. I will also use a single stick vs 2 with a Y adapter. I will have this setup in 2 weeks or so, I will see if this is any better.

I know that a guys here on this forum (Mkrusedc i think), use a 16018 with two Trackpower wired in serie (it's 20C pack!) and did'nt seam to have any problem. this is in an E-Maxx.

here the link of this e-maxx
http://www.rc-monster.com/forum/show...hlight=neumaxx

Run the auto tune setup

Could you tell me why?? What's difference that runing the Auto tuning can help with the LVC issue?

Thank's

Does that really help with the cutting out problem some are experiencing?

Rrealy don't know why somes guys have this problem and other don't:neutral:
The only thing i can suspect, is the LVC on somes MGM version that are different, maybe set at 3.2 to the place of 3.1, and with cheaper li-po pack, the LVC kick in sooner.

But with high end pack like Flightpower, i suspect that the problem will be present when the batterie will be at half of the capacity:neutral:

running the auto setup does nothing for this. I do run it, and it has helped other issues, but not this one.

I suspect it is the batteries, the LVC will trigger when I'm on it hard. If I don't run WOT then it doesn't trigger the LVC.

My guess is that under heavy load (e-maxx running 5S, weight 12lbs) that the voltage dips low enough to trigger this problem.

If it is not the batteries, then the MGM is triggering it too soon.

I found the auto tune to help.

I had 2 of these and a 16024 at one piont. I still have one of the 16018s. All 3 were the same with regard to this. They are slightly quirky, but if you set it up right they are great. Notthing runs cooler or smoother. The Auto Tune sequence is meant to give the controller the operating parameters for it to work within and really helps the brakes, and I have also found that it also helps the LVC to be a little less sensitive. Aslo when I was running into LVC quirks, I had the motor spool up set to the lowest possible setting. I found running at the stock setting or even one setting slower spool up really made a huge difference in the LVC also, and fianllay making sure you are running high quality pack makes a difference too.

The the way the LVC calculates the cut off voltage in the MGMs is a little different than most other controllers. I read about it in the instructions that came with the controllers and its all a little confusing and I certainly dont completely understand it, what I gathered from it is: Its not just a hard number that it cuts off at. It is done by calculating voltage drop under load vs at rest. I suspect that the auto tuning run allows it to calculate a base line for the cut off, so not doing the auto tune give it no base line and probably leaves it at a some sort of default. I wish the instructons did a better job of explaining what all of the setting do and especially how the LVC is calculated.

Anyway, this is just my experience, I may be off base. I just know that I was able to tune these issues out in my setups without to much trouble.

Just try it. I made a difference for me.