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05-13-2011, 11:03 AM | #1 |
Newbie Join Date: Apr 2011 Location: Gresham, OR
Posts: 6
| strange issue - MMP + Futaba T3PL
I've got a weird issue going on that I'm not sure what it boils down to, any assistance would be great! setup: Custom Clod Buster chassis Trinity Titanite brushed motors (I'm old school). Motors have .047u ceramic caps installed. Duratrax 8.4v 4600Mah batts w/Deans Mamba Max Pro - configured for brushed/reverse, BEC at 6v, cut off voltage disabled, no throttle/brake curves applied. Futaba T3PL radio - linked to transmitter no prob. Futaba s3305 servos. I just got the radio yesterday, got it configured for 4ws, no EPA/TRIM adjustments, etc. MMP is only a month old, and I havent used it yet. Batts are brand new - never used (and fully charged). Steering is working fine in the respect that the servos are reversed correctly. Throttle works great (yes I reversed ch2). However, when I try steering back and forth a few times, the receiver light goes to red, all the lights on the MMP light up, and I'm dead in the water until it resets. I've was thinking it may have been a short on the servos since I had to solder on longer cables, but trying one at a time I still have the issue - just not as often. I've tried changing the BEC voltage on the MMP from lowest to highest - still have the issue. changed cut off voltage on the MMP to various settings, nada. If I change the transmitters ch4 to INH (inhibited) it sort of works for a bit, but I have the same issue ultimately. Also, the yellow light on the MMP is always flashing - I read this is due to the latest firmware? (which I applied a few weeks ago) is this correct? Just a litle annoyed at this, as this is all new gear - radio/esc/batts, and I am chomping at the bit to run this thing on the street! this is my first project "back" into R/C in years.. any ideas, thoughts, questions, voodoo tricks to make this work w/o issue? -Jim |
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05-13-2011, 11:17 AM | #2 |
I wanna be Dave Join Date: Dec 2006 Location: Goin broke losing weight.....
Posts: 2,262
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Have you tried an external bec? You could be overloading the internal bec w the dual servos. Is you battery lipo or 7 cell nimh? Dont run cutoff w nimh. |
05-13-2011, 11:17 AM | #3 |
Newbie Join Date: Apr 2011 Location: San Diego
Posts: 16
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you might need an external BEC. I have run in to that problem with my mmp in my short course truck.
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05-13-2011, 11:22 AM | #4 |
Newbie Join Date: Apr 2011 Location: Gresham, OR
Posts: 6
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havent tried external bec (yet). that would kind of suck of that was the cure... yet another battery to buy. heh. batts are NIMH FWIW. |
05-13-2011, 11:26 AM | #5 |
Quarry Creeper Join Date: Dec 2008 Location: Australia
Posts: 269
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I think you need a BEC like the Castle Creations CC BEC. To find out since you are OLD SCHOOL, remove the red wire from your MMP and plug a receiver pack that you should have sitting around into the battery port on the receivers. Give it a drive and see if the problem goes away. BTW - increasing the voltage should have made things worse and the yellow led flashing is normal. |
05-13-2011, 11:31 AM | #6 |
Newbie Join Date: Apr 2011 Location: Gresham, OR
Posts: 6
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so, i just happened to locate one of those old 4cell batt holders for receivers from an old radio, plugged it right in, and it appears to have resolved the problem! Superroo, which red wire are you referring to? the one from the MMP to the reciever? is it possible to remove w/o destroying anything? Am I running the risk of damaging the receiver with both the MMP BEC and the batt pack? |
05-13-2011, 11:33 AM | #7 |
Newbie Join Date: Apr 2011 Location: Gresham, OR
Posts: 6
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just looked at the CC BEC.. might not be a bad idea.. ;)
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05-13-2011, 11:41 AM | #8 | |
Quarry Creeper Join Date: Dec 2008 Location: Australia
Posts: 269
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05-13-2011, 11:42 AM | #9 |
Newbie Join Date: Apr 2011 Location: Gresham, OR
Posts: 6
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Got it out w/o issue.. got the batt pack for (bec) taped in temporarily so I can drive this thing before I gotta split for work. thanks so much! so glad I didn't end up calling Castle or Futaba! |
05-13-2011, 12:11 PM | #10 |
Newbie Join Date: Apr 2011 Location: Gresham, OR
Posts: 6
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thx so much guys. thing runs great sans some adjustments, etc I need to make. trial run was pretty successful! |
05-13-2011, 01:03 PM | #11 |
Rock Stacker Join Date: May 2007 Location: Fort Payne
Posts: 92
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Some MMP version 2 had a problem with in 9-12 volt range batteries not wanting to turn on the receiver. I had one and called them they were very fast trading out. Call them they will fix you right up. Now I can put up to 25 volts on my MMP with no worries
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05-13-2011, 01:08 PM | #12 |
Rock Stacker Join Date: May 2007 Location: Fort Payne
Posts: 92
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BTW i run MMP , brushless and a synthesized 3 pl also just make sure your servos can take the voltage that you set the esc for I burnt a dig servo haha
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12-29-2011, 08:01 PM | #13 |
Rock Crawler Join Date: Jun 2009 Location: summertown
Posts: 512
| Re: strange issue - MMP + Futaba T3PL
Why would you run an Extra pack just for your BEC? You can just solder the BEC wires to the ESC battery wires and it'll run off the main pack just fine. |
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