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Old 10-13-2008, 08:37 PM   #1
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Default Futaba Fasst going into failsafe

Well this is what has me scratching my head:
While running my main yesterday, my car kept going into failsafe, happened 5 times during a 20 minute main.

Current set up:
Futaba Fasst System
JR Servos 8711
Losi Lipo and regulator
JR On off switch

I know that the receiver didn't overheat so I have ruled out that option.
Replaced on/off switch still goes into failsafe
Eliminate switch still the problem
Then I notice that the steering servo is getting really hot, so I eliminate the regulator and connect direct the lipo, doesn't go into failsafe while testing, but the steering servo is getting hotter and hotter (i think that eventually will go into failsafe)

Could a bad servo (steering) cause the system go into failsafe??
Is it normal for the servo to get that hot (not under load and still getting hotter)??
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Old 10-13-2008, 08:40 PM   #2
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It could be a bad servo. But try something else if you can. Other people have tried it and it works great for them but never has worked for me. Try a NiMh pack.
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Old 10-13-2008, 08:47 PM   #3
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A servo should not get that noticeably hot. And very well could be transferring the heat back thru the wires and into just that one slot of the reciever.

I thought the fassst system was having known overheating problems?
As well as lipo regulators?
..
Lots of things to try
Like said above try a nimh pack if you can.
Try runnng the regulator outside the rx box.
Try running with the lid off the rx box to allow more air to the rx.

Good luck, hope ya find the problem.
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Old 10-13-2008, 09:00 PM   #4
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i had this issue with my Fasst system when i was running a lipo with a regulator. It gets hot here in vegas. I switched to NIMH and it works fine.
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Old 10-13-2008, 09:33 PM   #5
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I've heard of quite a few people having problems with the fasst going into failsafe.

I've been running lipos for over 1 year w/ no issues. I deactivated the failsafe and have a small cooling hole in the receiver box...no issues at all.

Last edited by dsl; 10-14-2008 at 02:25 PM.
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Old 10-13-2008, 09:59 PM   #6
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I never had problem with mine, i used to run hump packs, now i run lipo by common sense with novak 6v regluator. I dont see whats up??
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Old 10-13-2008, 10:02 PM   #7
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I've had continual problems with my Faast system going into failsafe. I've tried a different reciever, Lipo packs(multiple), regulators, and then finally switched to no regulator w/regular reciver pack. Still had problems no matter what.

I stopped running the Faast system and now don't have any problems.
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Old 10-14-2008, 01:47 AM   #8
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The receiver wont burn with straight 7.4 volts?
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Old 10-14-2008, 05:15 AM   #9
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tried a nimh but same problem.

I have been running the same set up for over a year now and never had a problem, I run the same in my buggy with no flaws. As stated I now that the receiver is not thermaling.

Going to try a different servo and see what happens.
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Old 10-14-2008, 09:45 AM   #10
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are your servo's digital? If they are not and you are running in HRS mode, that is the problem..

you must run a reg with lipo

I and many at my track have had issues with the losi regulators.......



when fasst overheats it doesn't go into failsafe mode the servo's lock where they are.

Just to be clear you ARE in failsafe, meaning your servo's reset to the preset position when it 'dies'?
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Old 10-14-2008, 09:50 AM   #11
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yes they are digital, I'll check tonight if I'm in HRS mode, but I did speak with the JR people and they said that there is no reason for the servo to get that hot or either that quickly (no load and working them for a couple of minutes the steering servo was really hot, and the throttle was cold)....gonna try new servo and check the mode.....
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Old 10-14-2008, 10:49 AM   #12
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spoke with the Futaba people, and they say it shouldn't make a difference, I can run HRS or PPM with digital servos.

I believe it's the steering servo mal functioning, and drawing more volts causing the system to go into failsafe. I'll try with new servos tonight.
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Old 10-14-2008, 10:58 AM   #13
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Quote:
Originally Posted by Toiffel View Post
spoke with the Futaba people, and they say it shouldn't make a difference, I can run HRS or PPM with digital servos.

I believe it's the steering servo mal functioning, and drawing more volts causing the system to go into failsafe. I'll try with new servos tonight.
BBq i had a similar prob with my 3pk w/spektrum....turned out to be a bad regulator, and the servos were getting the full 7.4v.. mucho callante !
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Last edited by jpalessi; 10-14-2008 at 11:37 AM.
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Old 10-14-2008, 11:14 AM   #14
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Quote:
Originally Posted by jpalessi View Post
BBq i had a similar prob with my 3pk w/spektrum....tuned out to be a bad regulator, and the servos were getting the full 7.4v.. mucho callante !
well I took the regulator out of the equation but the steering servo is getting even hotter than before, and there should be no reason for that, if so, both servos would be getting hot not only one....
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Old 10-14-2008, 11:39 AM   #15
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I'm sorry to say this guys,.. but Futaba has a known issue and there is no good way around it.

Lets just say the price of the modular 3PK is going back up. At least you can run Sektrum Pro or 75 band with the different modules on the 3PK. The Futaba 2.4 system ruined my last US Nationals. Period. Time to sell..... until they fix it.
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