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T-REX 500 › Help please...with align 3GX.
02-01-2013 10:19 PM  5 years agoPost 1
connor126

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Tulsa, Oklahoma

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So this is my first time setting up a FBL system. I have a Trex 500 ESP with the a brand new DFC head installed all new parts a new CC Talon 90 ESC and a brand new Align 3gX 3.0

I am still in the testing phase making sure everything is working properly before I slap the blades on and test hover. I went through the entire setup and got everything the way it is supposed to be. Pitch swash everything. Now what is happening is as I am applying throttle at about 70% the cyclic servos start twitching then the elevator servo slowly dips the swash forward like it is trying to level out. But the helicopter is level because it has no blades it is sitting on a flat surface. I am not sure what is going on but I am thinking vibration problem. The helicopter flew completely fine with the Fybarred head. I am just not sure if I did something wrong or what exactly.

I have Hitec HS-5245MG servos on cyclic and Futaba S9650 on tail. Any help would be much appreciated. and please do not suggest a new FBL system unless you want to give me some money to buy a new one. Otherwise its not that simple.

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02-01-2013 11:36 PM  5 years agoPost 2
dkshema

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Cedar Rapids, IA

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What voltage is your ESC BEC set to? Are you using satellite receivers, or a standard receiver? What does the power cabling look like in your setup>

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Dave

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

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02-01-2013 11:49 PM  5 years agoPost 3
connor126

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Tulsa, Oklahoma

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It is set to 6v I am using Spektrum Satellite receivers and my power cabling are you refering to the throttle cable from the esc, the power from battery to esc or all the servo cables in general? Not sure what you are refering to in the last question. Sorry

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02-02-2013 01:06 AM  5 years agoPost 4
dkshema

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Cedar Rapids, IA

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I wish to know how robust your power cabling is. I guess in this case from the battery to the ESC, and from the ESC to the 3GX.

I have found the 3GX/satellite receiver combination to be somewhat intolerant of an inadequate power supply. That includes the gauge of the wires that supply the power being too small.

V3.0 is a bit more power-hungry than V2.1.

When the weirdness happens, do either or both of the satellite receivers begin to blink their LEDs?

Are you using DSM2 or DSMx satellite receivers?

What transmitter are you using, as well?

Make certain that the cables between each satellite RX and the 3GX is fully plugged in, that the wires are not able to flop around, and that the cables themselves are in good shape.

I looked at the specs on the Talon 90 BEC, 9 amp continuous, 20 amp peak, that should be fine. What bothers me just a bit is that CC would use a single cable out of the ESC to the rest of the world, as servo-style connectors are really only rated at about 5 amps. Can you tell if the ESC/RX cable is 20 gauge, 22 gauge, or something else?

Do you have anything plugged in between the ESC output cable and the 3GX itself?

I will also assume that you have completed the initial "DIR" mode setup, and the ensuing steps that teach the 3GX swash type, direction and stick limits successfully.

-----
Dave

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

Team Heliproz

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02-02-2013 01:37 AM  5 years agoPost 5
connor126

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Tulsa, Oklahoma

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Well the power cables on the esc and my lipo are 10 gauge. I am using DSM2 with a DX7 and no the lights do not blink on the esc, the satellite or the 3gx itself.

The cables are in good shape I have checked those.

Ya I know what you are saying about the Talon 90. But supposidly they ran tests and everything and had no issues. The gauge is just your standard servo gauge wiring about 20 I would say. Nothing gets hot I ran it for about 1min to 2 min straight to see if I could figure out the vibrate and nothing got anywhere close to being hot maybe tad warm but thats about it.

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02-02-2013 01:39 AM  5 years agoPost 6
connor126

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Tulsa, Oklahoma

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Yes I did follow each and every step. the swash stays level all the way until about 60-70% throttle then the servos start twitching up and down then the elevator servo pushes the swash forward. When I let off the throttle it levels itself back out. Nope nothing in between the esc and the 3gx

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02-02-2013 02:51 AM  5 years agoPost 7
dkshema

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Cedar Rapids, IA

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Sounds all good.

I suppose just to be sure, I'd maybe plug one servo in at a time, maybe there is something going on servo-wise. Troubleshooting isn't too much fun, but if you do it systematically, you have a good chance of finding the culprit.

I guess one other off the wall idea would be to watch the transmitter servo monitor screen when you move the sticks, to see if there might be something going on at the transmitter end.

-----
Dave

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

Team Heliproz

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02-02-2013 03:01 AM  5 years agoPost 8
connor126

rrNovice

Tulsa, Oklahoma

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Okay I'll try that. Thank you for the information much appreciated. I'll post back with results. I was also thinking about relocating the 3gx to the receiver tray on my 500. Right now it is just above the boom where the gyro would go.

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02-02-2013 03:22 AM  5 years agoPost 9
dkshema

rrMaster

Cedar Rapids, IA

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The location isn't the problem...

My DFC converted 500...

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Dave

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

Team Heliproz

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02-02-2013 03:43 AM  5 years agoPost 10
connor126

rrNovice

Tulsa, Oklahoma

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Well that's at least ruled out

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02-02-2013 04:55 AM  5 years agoPost 11
dkshema

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Cedar Rapids, IA

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Another thought, roll the software back to V2.1, see if there is any difference in operation.

-----
Dave

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

Team Heliproz

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02-02-2013 05:20 AM  5 years agoPost 12
robv

rrApprentice

SoCal

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Sounds to me like the sensor is picking up a vibration. Its normal for the cyclic to move around on the bench, even while spooling it up. But the twitchiness is a good indication of vibes.

Try this...

Take the sensor off the heli and mount it on something else and spool up the heli. If it still twitches it could be an electrical problem.

Team JR | Gens Ace | YS Engines | Scorpion Motors | Pure Tech

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02-02-2013 06:24 AM  5 years agoPost 13
connor126

rrNovice

Tulsa, Oklahoma

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Okay I'll try that see what happens.

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02-03-2013 10:32 PM  5 years agoPost 14
connor126

rrNovice

Tulsa, Oklahoma

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So I just not got time to test it out. It is deffinetly a vibration issue. I took the 3gx off the heli and set it to the side and then spooled up. It no longer twitches anywhere near as bad and the swash no longer dips forward. Would adding more foam tape help with that?

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02-03-2013 11:46 PM  5 years agoPost 15
connor126

rrNovice

Tulsa, Oklahoma

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So I went ahead and installed two layers of foam tape and BAM!! problem is solved. I want to thank you dkshema and robv for giving your advice and assistance thank you

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02-04-2013 05:49 AM  5 years agoPost 16
dkshema

rrMaster

Cedar Rapids, IA

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Just how much vibration is there in your 500? And where is it coming from?

Are you using the tape that came with the 3GX, or something different?

-----
Dave

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

Team Heliproz

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