2.4 reboot / failsafe

[rkeith2]

Anyone else running 2.4 spektrum and suffered a reboot or failsafe?

Running a Wren mw54 on 7.4 lipos thru fadec and 2.4 7000 RX on Duralite with switched regulator at 5.2. All 9252's and 611 gyro.

I fear this has caused the last two crashes and after repairs today in a hover it went into failsafe and shutdown.

I can monitor and load all servos with rapid stick movement and the gyro screen always stays at 5.2volts.

I think I am ready to go back to channel 19

[lperagallo]

Ron,

I have not had a problem with my AR7000 RX in either of my machines with an exception of one time where my voltage went bad (don't ask how that happened) and one time I couldn't get a bind and found the remote RX to be bad, but that was a problem during start up so I didn't even get a connection. I mount my RX with Velcro that I think further isolates some of the vibration of the Gasser, but I've had a couple of crashes that probably caused the remote RX to get damaged.

I'd play around with the remote RX and see if you can get it to fail. When playing with mine I eventually got it to break in the case. You should also check all your wiring for a loose, chafed or broken wire. I know you keep your machines in good condition so this would be a long shot, but it's worth trying. The other thing I'd do is switch out the RX with another known good one and see if you can get it to fail on the ground.

By the way, I have my RX mounted on top of the FADEC with the remote RX velcroed on the lower side frame. By the way, what happened that caused you to think it rebooted or went to failsafe? Since you can only control the throttle in failsafe, it takes a few seconds for the engine to come off power. Did that happen or did you loose total control of the servos?

I hope you figure that problem out.

Lou

[rkeith2]

I had the bird rollover to the left a couple of weeks ago so I replaced the 9000 rx with a 7000 and all new 9252 servos.

I tested and loaded the duralites with the 7.5 amp switched regulator up to 3 amps draw and all was very healthy.

Hovering and trimming the bird locked "failsafe" all neutral and the engine shut down. She settled nicely on the ground but it sure looks a feels like a reboot even though with the load I could not get it lower that 5 volts.

I replaced the 2.4 with a JR649 to try today and see if all nonsense has stopped and if so I suspect I need to look at more power like 6 volts to all but the 611 gyro.

[cbergen]

Check the 2.4 forums, it seems there are a few others having issues as well.........

Scary.

[rkeith2]

Well -

Test flights today with the JR649 were fine so I expect that I need to lay some more power to the Spektrum RX and plug in the capacitor as well.

I am leaning towards the 9100 RX and dual LiPo's

[lperagallo]

Ron,

What about the TX? If you've had a problem with both the 9000 and 7000, maybe the transmitter has a problem. Since you are back to the JR radio for now, I'd send back the transmitter and have it checked out.

I flew two flights today (30 degrees) on both the Gasser and Turbine and and didn't have any problems except as I loaded Powermax I heard a leak when the tank was getting full. I guess I'll have to look into that one. There was enough gas to get the engine started, but this is the first time I heard gas escape. Hopefully it's not the selenoid. The transmitter Mitt also got a workout in the weather today. Thank goodness for innovation and creativity of people to come up with a great accessory.
Lou

[rkeith2]

I fly several other machines on the 9303 with no problems at all whether module or channel 19 regular 72mhz band.

I just finished mounting the 9000 with the 4700 uf capacitor, a new 10 amp non switched regulator and I am waiting for new 4000 MAH LiPo to charge up so I can mount that underneath.

I will be running 6 volts to receiver and all cyclic servos and I have reduced the tail to 5.1 volt.

Tomorrow will tell if my rework homework is flight worthy.

[lperagallo]

Ron,

Let's stay with this post so I don't have to continue going back and forth. Are you running a 2.4 module or a DX7? I have no experience with the modules and I have heard of a few issue with installation and cable breaks. I think there is a technical notice on the Spektrum site about the modules and cables. Check that out to see if that could apply. See my other response over at RR to see my set up.

I was a bit cold today as it only got up to about 31 degrees, but I got 2 turbine and 2 gasser flights in. Hopefully I can get a couple in tomorrow, it's supposed to be 38. I am really getting tired of flying in the gray though, flat light and all. Oh great just heard the weather report.....light snow around noon. Well maybe I'll stay in and finish the Cessna 182 I'm building.

Lou

[FishtoFly]

I have flown my Bergen Eb's with 9303 and the xps system and raja's gen set on both never had a problem with at least 3 gallons run through them
Odd

[rkeith2]

New power setup cured the reboot and brown out issues:

4000MAH LiPo's
6 volts through 10 amp regulator
5.1 volt regulator on the tail servo
4700 uf @ 10volt cap

[PaulH]

If moving from a single 7.5 A regulator to a dual regulator solution solved your problem, then your electronics package is drawing more current than you think. Do you have an Eagle Tree logger or a watt meter of some kind that you could use to record the current usage with during a flight?

I know regulated lithium packs are the current "in" technology, but have you considered using simple NiCd or NiMH packs instead? Take a look at the ones made by NoBS Batteries:

http://www.hangtimes.com/giantrxpacks.html

Scroll down to the Sanyo N-1900SCR pack and read the specs on it, and the next few below it. Some of them have an internal resistance as low as 4 miliohms and can handle a current draw up to 40 A. Put two packs in parallel, like Duralite does for their 4000+ mAh packs and you should never have a problem with current draw.

[rkeith2]

Moved from a 7.5A switched Li Ion over to a 10A LiPo

[PaulH]

Switching battery chemistry shouldn't make much of a difference in your situation. The Duralite 2s2p Li-Ion packs are 4300 mAh. A Li-Ion can be (safely) discharged at 4C, which is over 17 A. The regulator between the battery and the receiver is the limiting factor in how much current the electronics can draw.

Also, the gyro and tail rotor servo are now on a separate regulator, further reducing the load on your primary regulator.

[rappy-60]

I know there were a rash of the new 9ch RX that were bad, had a undervoltage problem that if the voltage dropped below a certain threshold they would re-boot. Some of the RX were out of spec, and JR/Spektrum replaced them FOC. What receicver were you using? Was it the 9000? Because if it was, that was one that had issues.