Spektrum rx reset

[Ashley Davis]

Today one of my 600Es stopped responding mid flip. It neither shutdown or responded to any stick movements, not even throttle hold.
Went in at full power, then just as it hit the ground, all shutdown.


So, post crash synopsis is that this is consistent with a spektrum rx reset. Now the rx lipo was fully charged and verified after the flight as fine. So the only possibility is it reset for no reason at all OR the regulator dipped low on voltage and it reset.

The regulator is the standard 3A Align regulator that comes in the kit.

My thoughts are that it's running high power servos and I'm thrashing the machine much more than I used to.....and it just couldn't cope for a split millisecond. Problem is once that reset starts it's 3 seconds before the heli comes back online.

I'll be fitting the voltage hold up capacitors to all my machines now, a few quid to save over £100 is worth it.

[mattie-lodge]

I have heard of this before. Also i know that Fromco are in final stages of producing a gadget (hold caps) to prevent this from happening. I might chase this up a little quicker now I heard about this.

Dude really sorry to hear about your model

[Ashley Davis]

Had a long chat about it with Andy at Real Raptors, I've got one of the Fromeco devices on it's way to have a play with.

[Edders]

I think this is what your after
ive been running this for a week or so now and it never dips below 5.8 during a flight

http://www.realraptors.co.uk/zen-car...oducts_id=2773

Edders

[Ashley Davis]

The biggest problem with this type of failure is the machine does NOT failsafe, it doesn't shutdown, it just keeps going full chat until the rx comes back online.

[Edders]

yep and its ten seconds to reset I heard now that sucks


unlucky ash

Edders

[moyesboy]

Have you loked with a power analyser to see what you can pull the voltsdown to loading up the servos ash? or even reproduce the reset?
This sounds exactly how a big electric plank met its end at our club field. after they could reproduce the reset by loading up the servos (which were big digitals, on a regulator that wasn't up to the job).

When the 2 in 1 for the nitro delivers 7A, how come they sell the same size machine with a 3A regulator?

I thought the regulators were 6A anyway?
Like this one:
http://www.fast-lad.co.uk/store/prod...oducts_id=2453


Theyt don't seem to sell the 3A regulator anywahere only bundled in the kits?
...or the heli shops don't stock it becuase they know its not up to it.

3A is the std claim for a terex450 ESC with built in BEC on a 3 cell pack and we know some of them aren't up to that lesser job....

Sounds like a warning should be sent out to all 600e owners!

[moyesboy]

Another thought
I was thinking of making up a distribution board, pulling all the power crimps out of the servo plugs and splitting them.Then running the servos off one power supply, and fitting a little AAA nimh Rx pack that powers only the receiver. this would cure all the voltage issues because the servos will work through quite low voltage transients, and anyway will recover pretty much instantly. The rx on its own will run for ages off a 250mah nicad. That might actually weigh less than adding the extra stuff.

[Smoothound]

We used to do something similar on cars to avoid pulling too much current through the Rx

[Smoothound]

The 3A Regs were the early ones I thought? My 600 now has a 6A one on it as I was worried about the capacity of the original with multiple digital servos

[Ashley Davis]

yeah it's an early 600 one....which I flew for ages no issues.......but my flying has changed a lot since it was last used. The 8S machine has the PowerForce VRLII it can run 23 servos.

[Tean]

Sorry to hear about the crash Ashley.

I had a crash with my Logo 500 with identical symptoms. It locked out during a low level tictoc session. The cause was a power brown out from a poor BEC. The Spektrum receivers seem very sensitive to low supply volts which causes them to reboot, taking several seconds during which there is no control and no failsafe.

I now run my flybarless models on twin Dimension VHV BECs wired in parallel. This gives a beefy 5A continuous rating and redundancy if one of the BECs packs up.

[Ashley Davis]

I may install another powerforce, they are 10A continuous.....just bloody big and hard to find space to install.

[Nutz]

I would not of advised using a 3A reg to anyone running digitals, all those electric would easily overload the reg. My little plane maxes 1A easy and that is 4 cheap micro servo and a AR6100 RX.

3 x digi cyclic/collective servos, governor, gyro, digital tail servo and RX could easily get to 3A if flown hard enough.

[simon_t]

Unless you are using a high bandwidth Oscilloscope or similar you cannot detect the very fast low going spikes that cause this. A voltage or power meter will not show it - it probably only takes a glitch lasting a few nano-seconds (at the Rx processor). If the processor is reset it takes a long time to get going again and re-establish the Tx link, whereas a 'normal hold' will recover immediately good data is received. Like you Ashley, I have succumbed to a poor Rx supply, in spite of being very aware of the issues and thinking I was being careful. I have now made up my own plug in capacitors to provide some voltage hold up. The Fromeco device uses capacitors with an active boost circuit, so should provide a very superior hold up function. I would still be nervous about a 3A reg in a high demand flight pattern.

Simon