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Home > Main Discussion > Servos twitch or jump with Align 3gx system
dkshema

rrMaster

Cedar Rapids, IA

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Are you STILL using this BEC:

ALL LEDs flashing GREEN indicates your 3GX went through a reset, probably due to low power.

The regulator shown, if this is the one you have, is good for ONLY 3 AMPS. It IS NOT suitable for use with a 3GX (or any other FBL controller) in a 600 sized heli.

It cannot supply necessary current to keep the FBL controller happy.

The BATTERY isn't the problem at 1600 mah. If you battery is really old, and perhaps on its last legs, it's only making the problem worse.

I have had excellent luck with Align 2N1 regulators and the 3GX, using the standard 2S 1900 mah LiPo. I get about five flights before needing to recharge. The 2N1, however, is good for 6 amps, twice the current of the RCE-B3X.

Stop fiddling with a regulator that is NOT capable of doing the job. Find one that is.

-----
Dave

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

Team Heliproz

02-06-2017 01:59 AM
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_dloe_

Heliman

Winton, Ca - USA

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Yes. That looks like what is in this unit. In your opinion is the CC 90 Talon enough for the whole thing? Someone at our club field recommended it for this heli. I see someone in this forum said it's too small. I'm really new at this obviously and I should have bought one ready to fly. I'm only learning to fly right now. Basically sport flying.

02-06-2017 02:35 AM
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dkshema

rrMaster

Cedar Rapids, IA

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This is your heli, from your gallery --

That kit, back when it shipped, shipped with the 600 XL motor (not known for being a powerhouse, or for efficiency), however, that kit shipped with a 75 AMP ESC.

Your Talon 90 is a 90 amp unit, it should be good enough for the heli at this point. With regard to its ability to power your FBL system, servos, and receiver, the Talon 90 is very good, very capable at 10 amps with 20 amp peaks.

-----
Dave

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

Team Heliproz

02-06-2017 04:05 AM
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wc_wickedclown

rrProfessor

long beach calif

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Watch at YouTube

Insha Allah

02-10-2017 10:15 AM
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wc_wickedclown

rrProfessor

long beach calif

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I found it not to be a problem in flight.
flew my 700 without proper bec set up watch what happened

Watch at YouTube

Insha Allah

02-10-2017 10:22 AM
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allns47

Key Veteran

Richmond IN.

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Wow

03-10-2017 01:34 PM
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EEngineer

Elite Veteran

TX

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"I think you are using the RCE-B3X that came with your 600. That is a 3 amp BEC and very marginal for a 600 FBL heli. Do not attempt to fly using it."

3A?????

I totally agree.....I'd be scared of running one servo on 3A on a 600 size heli servos.

FWIW

Logo 600SXs, 700XX, 800XX

03-10-2017 06:48 PM
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_dloe_

Heliman

Winton, Ca - USA

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I took the bec and the speed controls both off the 600 and installed the Talon 90. I still could not get the 3gx to quit jumping. It wasn't too scary but the heli would tip forward when that happened. In the mean time we found and installed an AR7210BX on it. With those two changes it really flies nice!!!!

I still don't know what I'm doing wrong with the 3gx though. Maybe that still was not enough power? I saw someone suggested running two power cables to it?

I'd like to find the problem because I still have one on a 450L that does exactly the same thing.

03-10-2017 08:14 PM
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EEngineer

Elite Veteran

TX

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"In the mean time we found and installed an AR7210BX on it. With those two changes it really flies nice!!!!"

I think ya'll solved your issue.....cool...^5s.

Why waste time chasing an issue that doesn't exists anymore with your current setup?

Logo 600SXs, 700XX, 800XX

03-10-2017 08:23 PM
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_dloe_

Heliman

Winton, Ca - USA

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I've only fixed the TRex 600. My 450L still has a 3gx on it that was doing exactly the same as the 600 was. Maybe I'll need to get another AR7210BX for it too? I'd like the 3gx to work since it is already installed.

03-10-2017 08:35 PM
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EEngineer

Elite Veteran

TX

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"I'd like the 3gx to work since it is already installed."

I can understand that....but...are you absolutely...positively...certain that you're providing that FBL+servos+anything else with adequate voltage/current?

Did you confirm that by using a DVM to check it?

Check the voltage/current, not only at the BEC's output, but also at the FBL. It's super easy to make a "voltage test cable" and also a "current test cable" from two spare servo extension leads.

The voltage cable(cut off the connector that doesn't mate with a spare FBL input port) plugs into the FBL to see what voltage the FBL is "seeing" using your DVM.

The current cable is used as a FBL power input extension lead, but cut the red(+ lead) and use the DVM to "complete" the circuit. The DVM will then display the current being used by the "system".

You might just have a bad connection at a connector which can prevent proper voltage/current from being properly distributed.

Given that swapping out the FBL solved your issue, I doubt the above would apply....just mentioned it as a trouble-shooting method for power issues.

Other than installing the latest f/w updates to see if that helps, I'd switch it out.

Is it possible to call Align USA and get their advice?

Good luck.

Logo 600SXs, 700XX, 800XX

03-10-2017 10:34 PM
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_dloe_

Heliman

Winton, Ca - USA

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On this 450L I may not be providing enough power. I'm using a esc off a Blade 450X that provides enough power for an AR7200BX. I haven't tested the power like suggested yet. I'll need to make the test leads to check it.

03-11-2017 01:50 AM
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EEngineer

Elite Veteran

TX

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The AR7200BX only draws ~300 mA...under any bench conditions...even stalling a servo. I have measured this many times.

The servos are the biggest current hogs....especially when there's drag on them.

Logo 600SXs, 700XX, 800XX

03-11-2017 01:59 AM
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