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Home✈️Aircraft🚁Helicoptere-AlignT-REX 450 › 3GX ESD ISSUE / RESET IN FLIGHT ? NEED HELP PLEASE
03-31-2012 04:32 AM  7 years ago
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pturcotte

rrNovice

Deux-Montagnes, QC, Canada

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3GX ESD ISSUE / RESET IN FLIGHT ? NEED HELP PLEASE
Hi Guys,

I think I have the 3GX ESD can you help me to identify this pelase?

I went at the field today.
Flew my TREX 450 PRO V2.
3GX module did really weird and nasty things.
I lost the tail, like I had to compensate a lot with the rudder, then the aileron and elevator were totally off as well.

I have been able to land it but unfortunately, for a reason I don't know, when it was on the skid it did a strong right aileron and it tipped over. Nothing major, but still, 3GX module went spastic....

Is it the same issue that everybody is talking about? Like it resets in the air and when it reinitializes IN THE AIR, then gyro has a hard time because it is not levelled, etc.

What can I do? Proceed with the grounding and chrome removal procedure?

It is a concern for me because I also have a 550 V2 3GX. So I think I will use it's 3GX module to put it in my 450 and buy a mini VBAR for the 550...

I am sure I am not the only one that got this issue. Can you help me?

(Please note that the 3GX is in the inverted position under the tail servo not on the top)

Regards,

pturcotte
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03-31-2012 05:26 AM  7 years ago
3dgimble

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Rochester

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Welcome to the reset club buddy. I vented my frustration on RR, on align thread that it reset and ruined brand new blades and cost me over $100 of damage, no warranty on crashes.
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03-31-2012 02:33 PM  7 years ago
dkshema

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Cedar Rapids, IA

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Before you jump to the conclusion that you got a reset caused by ESD, keep in mind that the 450 class of helis, as a whole, has NOT been known to be plagued by reports of static discharges resetting ANY radio. The 500 belt-driven kits, yes. But not the 450.

I would suspect that if you are experiencing problems that you need to look at what you're using to supply power to your electronics and ask if it is robust enough to handle the power demands. Your BEC may not be up to the task.

As for that near tip-over while on the skid on the ground, FBL systems, if you have enough RPM and lift to move the heli, if you move the cyclic, the heli will react and quickly. Since the skids are on the ground, you can end up with a dynamic rollover event very quickly. Either get airborne or get your headspeed into a safe range quickly when sitting on the ground to avoid sudden surprises as you had.
-----
Dave

* Making the World Better -- One Helicopter at a time! *

Team Heliproz
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04-01-2012 01:04 AM  7 years ago
pturcotte

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Deux-Montagnes, QC, Canada

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Hi dkshema,

I am not jumping to the conclusion I am really sure it was a reset in flight...

What happend is that I was hovering to test it, maybe 20' in the air. It was my 3rd flight with this strange behavior.

It suddently did a drop by maybe 3' and has started to do it again.

The best way I can describe it is that the heli was a bit tilt to the right. As I suspect it has reinitialized while I was correcting, aileron, elevator and rudder. So, during reinitialization all the given inputs to the 3GX will be considered as neutral position for the cyclic and rudder. But, because these inputs are not at neutral position, you then have to over correct in the other direction to stabilize it if you still have enough stick travel to do it.

I have landed it, throttle hold, etc. The error I did was to hold off the cyclic stick as I am doing usually after landing. Head was still spinning, 3GX was not at neutral as per is "Wrong Initialization" settings it got in the air. So it gave right aileron and it tipped over.

Nothing to do with the BEC, it is definately a 3GX issue.

I am not the only one that got this issue. I got few PM of guys saying to me that they got the exact same symptom as me.

BTW, I read your reply regarding the belt etc. The 3GX is a FBL module and this issue definately happened to few people and they are all flying TT models, no belt drive...

Regards,

pturcotte
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04-02-2012 12:38 AM  7 years ago
dkshema

rrMaster

Cedar Rapids, IA

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no belt drive
Yes, I should have picked up on that, 450 Pro...

But that even pretty much indicates this is not an ESD caused issue at all. The most likely source of ESD in these helis is the belt and its two pulleys. With those out of the picture, you don't have a potential ESD generator on board.

Is this setup using Spektrum satellites or some other form of receiver?

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I know the 3GX is a FBL module, I own three of them.

-----

I don't know what removing the chrome plate would do, other than make the gyro sensors more susceptible to electromagnetic interference from outside sources (motor commutation noise, ESC switching noise, etc.).

-----

I'm still thinking noise on the power lines going into the 3GX controller, voltage momentarily drooping too low, or if it's using satellite receivers, problems in the cables/connectors between the satellites and controller, is the most likely cause.

I suppose location of the 3GX module in relation to the ESC and/or motor may also be a problem here. When I first built one of my Trex 250s, the gyro went nuts as I spun up the motor. Moving the ESC away from the gyro cured the problem immediately.
-----
Dave

* Making the World Better -- One Helicopter at a time! *

Team Heliproz
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04-02-2012 01:32 AM  7 years ago
pturcotte

rrNovice

Deux-Montagnes, QC, Canada

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All this makes sense. But still, I did 300+ flights on it since Oct2011 and this is the first time ever I got this.
I will see I will fix it this week.
I will use my other 3GX module, the one I have on my 550.
And regarding the chrome acting as a "RF shield", to be efficient it would need to be grounded...
I will see.
Regards,
pturcotte
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04-03-2012 03:07 AM  7 years ago
dkshema

rrMaster

Cedar Rapids, IA

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I'm a many miles from my house right now, sitting in a hotel in Savannah, Georgia. If I were home, I'd whip out my trusty DMM and see if maybe the case of the 3GX isn't grounded through the power ground wire. Just a thought.

But again, there isn't a source of ESD on your heli at this point so chasing that angle might be fun, but I doubt very productive.

300+ flights, maybe something else in your system is acting up. Time to check all wires for fraying, chafed insulation, intermittent/cold solder joints, the usual stuff.
-----
Dave

* Making the World Better -- One Helicopter at a time! *

Team Heliproz
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