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› Trex 600E Glitching
12-02-2007 09:23 PM  10 years agoPost 1
steve9534

rrKey Veteran

yakima, wa.

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I have a problem with my 600E that I get a t/r glitch. I'm using a Spectrum radio that works fine with all my other helis and planes w/o problem. I've changed out the receiver, gyro, T/R servo, ESC, and motor w/o resolving the problem. I've used a different Rx pack and bypassed the switch w/o resolution. I've used 5 different motor packs from 3 different manufacturers w/o resolution. The only thing that fixes it is to use a smaller motor pinion. The problem disappears when I use a smaller pinion and thus have less load on the motor and this has been true of both the stock 600L motor as well as the NEU motor I replaced it with. The ESC has been replaced, but with another (new) Align ESC and I'm leaning toward the ESC as being the culprit. I'm running out of pieces to replace here. Nothing else glitches, it's only seen in the tail and I'm thinking it's motor related, ie: the t/r twitches when the motor power is inconsistent. By using a pinion a size smaller than optimum, the problem disappears. The motor, battery, and ESC are all cool at the end of the flight, and I'm getting 5+ minutes out of a pack and putting 3700 - 4000 mah back in. My question is: has anyone else seen this and can I expect it to go away if I get a different ESC? Thanks for any and all help. steve

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12-02-2007 10:16 PM  10 years agoPost 2
QueeQueg

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West Texas

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If you're using Gov mode sometimes the ESCs will do that but rarely.

Try throttle curves and if it's gone you'll know it's the ESC.

You could have a electrostatic discharge glitch from TR belt drive.

Belt drive helis are notorious for this.

It doesn't happen to all of them but some will have it and it's not just ehelis.

The first time i saw it was with a glow raptor 30 V1 years ago.

Try tighening or loosening the belt and you can also try some of the anti static sprays out for computers or even anti static fabric softners. some say WD40 stops it for a while. Spray a little on your belt and see if it disappears.

If any of these helps then you'll know what it is.

The cure is to ground the boom to CF frame with some wire.

BTW this can be a seasonal thing where it doesn't do it in the summer but starts in cold dry air in the winter.

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12-03-2007 02:24 AM  10 years agoPost 3
The_Widowmaker

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Bear Valley Springs, CA

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I did not read your entire post so you may have already tried this. I had a twitch in the tail on my SE V2 and it was caused by a bad cyclic servo. The cyclic was twitching just slightly, not enough to really notice but it made the tail twitch was very apparent. If I had not seen the cyclic twitch slightly on the bench I would have never suspected it. Swapped it out and it was all good.

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12-03-2007 03:21 AM  10 years agoPost 4
steve9534

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yakima, wa.

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Glitch

Thanks to you both, but I'm not using governor mode and have the torque tube drive. The problem goes away when I decrease the load on the motor by reducing the pinion size, so I wouldn't expect that it's caused by the cyclic servos. Anyone else have any ideas? Thanks. steve.

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12-03-2007 03:54 PM  10 years agoPost 5
QueeQueg

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West Texas

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a bad bearing can sometimes cause a glitch but that shouldn't be a problem with the DX7. although a friend had glitch on a Trex 450 that he did the same as you replaced virtually everything with negative results. he then went to a DX6 and it was still there so they're not 100% glitch proof.

Does it seem to you that there might be a momentary motor shut down. I'm talking for an instant a few miliseconds.

If so it would cause the tail to kick out for an instant as the motor shuts down and restarts.

If it's the ESC causing the glitch it should be visible in a graph from one of the flight data recorders like an eagle tree.

If you don't have one see if you can borrow one for a flight and look at the graph for hiccups around about the same time frequency as the glitch.

If you see something it would mean the ESC is likely the culprit

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12-03-2007 04:33 PM  10 years agoPost 6
steve9534

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yakima, wa.

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Glitch

The bad bearings aren't supposed to affect the Dx7, but I thought of that too. The problem does seem to be with the motor and it cutting out briefly. Occasionally it will do it even as I am spooling up the heli. I've watched and I can't see the t/r servo moving as it happens, so I believe it's a motor/ESC problem. The Eagle Tree data counter sounds like a good idea, I just don't know anyone who has one and am not terribly enthusiastic to spend my money to buy one. I was really hoping that someone else might have seen this with the Align ESC. I think the ESC is the culprit since I've replaced most every other part that seems relevant to the problem. I replaced the ESC too, but with another one from Align identical to the first. If there's an inherent problem with the ESC, then just putting in another one like it won't cure the difficulty. Thanks. again. steve.

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12-03-2007 05:07 PM  10 years agoPost 7
QueeQueg

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West Texas

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You can try a ferrite ring on the ESC SX lead.

I don't personally put much faith in them but some people do swear by them and some ESC manufacturers reccomend them. The're cheap and maybe worth a try.

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12-03-2007 07:14 PM  10 years agoPost 8
XRguy

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Agawam, MA

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I had a tail glitch problem before on my 600. The tail would just slightly kick to one side. It would only do this after I gave it some real juice in the air. I could hover for the whole battery pack without the glitch but I soon as I gave it more throttle the glitched kicked in. One day I was flying pretty hard and all of the sudden the tail would kick worse and worse until you could hear the motor dropping rpms. Thought it was the motor. Put an old motor back in and it did the same. Bought a new pheonix hv85 esc and the problem was gone.

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12-03-2007 07:42 PM  10 years agoPost 9
steve9534

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yakima, wa.

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Glitch

I tried it with and without the ferrite ring and it made no difference. Mine's responding pretty much as XRguy describes, it will sometimes kick in a hover, but is definitely worse when I load it up. I'm thinking I need to get a Different ESC. Anyone else had a similar problem? Thanks. steve.

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12-03-2007 07:52 PM  10 years agoPost 10
XRguy

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Agawam, MA

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I forgot to mention I had a factory align 75esc if that helps.

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12-03-2007 08:02 PM  10 years agoPost 11
Ville Erkkilä

rrApprentice

Oulu, Finland

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Hi,

How close is your gyro to tail drive gear bearing? Some people have had tail problems when they are using TT and their gyro is too close to the bearing.

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12-04-2007 02:03 AM  10 years agoPost 12
andyyliu

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Taiwan

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What frame you are using? Alu, GF or CF? I knew someone replace Alu frame with GF and glitch just gone...

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12-04-2007 03:15 AM  10 years agoPost 13
steve9534

rrKey Veteran

yakima, wa.

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Glitch

I've got the Alu frames and the gyro is on the bottom horizontal frame piece with the amp on the left side frame near the rear. I guess I could try moving the gyro around and see if it helps. Thanks. steve.

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