New MMM2200 combo - RC-Monster Forums

webracer · 10:39 PM

I have a G4 Chassis, FLM hybrids with HB lightning diffs (13/43), and RPM all around. Went running for the first time today with the new MMM2200 on dual 5s 30c 3600 packs. It was quite impressive, but quit a few times, the first of which was driving off my deck, the esc quit. I usually just drive down the stairs, and when the chassis hit the first step, the MMM quit, no lights on the esc. I pushed it down the steps and it rearmed. This happened a couple times on some flips as well. Seems a jarring caused the ESC to lose power. Don't know why, all power connections are perfect (and new). Is this what is referred to as cogging? I assumed cogging was a jumpy movement at slow speed. I am quite happy with the slow speed performance.
Has anyone ever experienced this with the lights off on the esc? It doesn't appear to be the switch either, usually just rolling it fwd a bit will cause the esc to come back on. This is brand new out of the box.
I will probably go run it a bit more tomorrow, had to make new battery straps today, as the ones I made didn't work out like I hoped. Got it now though.
Thanks

pb4ugo · 10.20.2009, 10:50 PM

Is it possible your switch is bumping/getting switched? It's easy on the MMM and why many eliminate the switch.

Otherwise it really sounds like a cold joint on your power wires. I know you said they were all good, but a triple check would be in order.

webracer · 10.21.2009, 12:19 AM

Maybe the switch is not very sturdy. I'll run the truck again tomorrow and see if it happens again. I don't have any problem bypassing the switch, didn't really want it anyway. The switch actuator is not being physically moved, maybe the contacts inside are poor? I ohmed out all my solder joints and gave them a good tug. I was very careful soldering. I am using the XT-60 connectors available from hobbycity. I like these connectors better than the traxxas or deans plugs.

webracer · 10.21.2009, 11:39 PM

So far so good... I jumped the switch, and redid the tranny. Had to shim the output and input sections to get the play out. Now it is much quieter, not so much vibration. I ran a bit tonight, and all is well, no cutting out. I need to modify the wheelie bar, as on 5s, this thing just flips, wheelie bar or not. Wow, this thing is fast!!!
Did some damage disassembling the chassis (to the ESC receiver wires). Had to open the case and do some soldering, replacing the wire to the receiver. My bad. While I was at it, I jumped the switch on the board.
Gotta be careful with the RC solutions cage, they don't deburr any edges, thats how I stripped my receiver wire.
Things working great now. Probably take it to the indoor track tomorrow at Joliet (leisurehoursraceway.com)
The MMM combo really woke this thing up. I am running 20/68 still, don't think I can handle any more speed right now (with the space I have available).