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Home✈️Aircraft🚁HelicopterHelicopter Main Discussion › Strange lockout - one for the electonics guru's
07-17-2006 08:47 AM  14 years ago
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Reesy

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Strange lockout - one for the electonics guru's
OK guys sorry this is a bit long winded but I'll try to give ALL the details,
Been flying my new carbon framed logo 10 for a bit and it flies fine.
Radio gear etc PCM9x 770s recv UBEC Jazz/Tango 8S2P lipo

The other day I set it down to tweak subtrims and when I spooled it up it went into lockout, everything running at 50% (engine stuck at 50% as well ) and just sat there spinning until the Jazz reached cutoff. phew.

Went home and swapped recv/crystal to a Zpcm from my Raptor ..tried again range check OK close up, got to 10 yds and no response then suddenly responded ..spooled up and went into lockout..ran back and after banging the sticks a bit regained contact and spooled it down.

Swapped back to S recv/crystal and replaced UBEC with a recv batt fully charged, plugged it in on the bench gyro light came on but no response to the sticks (had reset radio from Z to S)
tried a second Transmitter module/chrystal no difference.
have a ferrite ring fitted.

Plugged it in again last night and the radio worked.

All my other helis fly fine (same tranny module + freq)
UBEC gives 5.0v and recv pack gives 5.1-4.7v

(Assume it isn't the carbon frame as a lot of these occur BEFORE spooling up)

The best way I can describe the effect is as if 50% of the time it's like I've selected the wrong freq and it doesn't respond.

Obviously so far I've been extremely lucky this hasn't happened in the air but now I'm scared stiff to even contemplate attempting to fly.

Any suggestions would be EXTREMELY welcome

Thanks in advance
Paul
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07-17-2006 10:10 AM  14 years ago
PaulJC

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Hertfordshire UK

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As for the cause i'm not all that hot on electrics BUT all testing from now untill your 100% sure you've resolved it should be done without any blades attached to the heliRe-entering the atmosphere...
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07-17-2006 12:25 PM  14 years ago
I3DM

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Israel

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it should be done without any blades attached to the heli
I agree.
www.liorzahavi.com
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07-17-2006 08:18 PM  14 years ago
Reesy

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Thx for the input guys

I was kinda hoping for something a bit more technical tho

AFAICS I've swapped out all the obvious candidates with no obvious difference to the seemingly random events.

Just looking for something a bit more left field
Paul
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07-17-2006 08:39 PM  14 years ago
neophyte

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California

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Hi Paul -
I'm not the electronic guru, or the electronic gurus son, but I have been bit a few times by items as simple as a connection not fully engaged or a wire that has broken.
In order to find said recalcitrant part of the circuit, I disconnect components until the problem goes away. Primative but effective.
I am sure your helicopter problem is more complex
Ron
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07-17-2006 09:16 PM  14 years ago
Reesy

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Ron
How are you old bean? good to see you've got some good kit now ..still need to dabble wiv them leccies methinks

Actually your suggestion might be "it" time to go thru the connections with a toothcomb. Still not sure it fits all the criteria but something to try at least
Paul
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07-17-2006 09:37 PM  14 years ago
9387ASH

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UK

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Is the range where it all goes Tango Uniform constant ?
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07-17-2006 10:14 PM  14 years ago
GMPheli

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Do you not have your throttle set to turn off the esc when it locks out?
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07-17-2006 10:24 PM  14 years ago
Reesy

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It was a new setup and in my haste to setup the Jazz and go fly I forgot to set throttle FS to the correct setting. When it went into FS (at least thats what I'm assuming happened) the throttle sat at around 50%.

I've done it proper now

MacMan it seems to happen when I'm spooling up either it happens or it doesn't .. I've not had it once I'm at full (governed) throttle. Only happened twice so not reliable statistic.

When I plug in the CSM 720 lights up so some power is going in, just nothing responds. I assume it's not some ES buildup as I can get it on the bench with no spoolups

Sorry it's all a bit vague
Paul
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07-17-2006 10:25 PM  14 years ago
9387ASH

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UK

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It all depends on the nature of the lockout.
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07-18-2006 03:07 AM  14 years ago
GMPheli

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I agree with Neophyte. You know it's not the receiver, so disconnect components one at a time, and cycle it off and on a number of times. I would start with the esc and gyro.
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07-18-2006 05:26 AM  14 years ago
neophyte

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California

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Hey Paul -

To test the ESC, you might just disconnect the ESC from the reciever, and plug a servo in its place.

That way you could test the reciever output to the ESC.

One thing to remember; A power supply might show an acceptable voltage, until some significant Amps are drawn. Then it can fail completely.

Ron
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08-09-2006 03:34 PM  14 years ago
Reesy

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Hello chaps
Just a quick update sent the Rx and Xtal back to MacGregors for checking turned out the Xtal was a little off frequency ..just enough it was working 50% of the time.

Guess just this once patience did prove to b a virtue
Paul
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08-09-2006 06:25 PM  14 years ago
Hoverdown3K

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Rochester, New York

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Great find...!-= I know there is Money in RC helicopters. I put it there=-
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08-09-2006 09:36 PM  14 years ago
GMPheli

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W. Bridgewater, MA USA

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But you swapped out the receiver and crystal with the one from your Raptor????
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08-09-2006 10:53 PM  14 years ago
Reesy

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Well yeah

Trouble is I've no idea what's behind all this but I guess I'll just have to tough up and try it .. had a long chat with Ken Brewer (Macgregors guru) and he reckons it might be the carbon frame so will route as far away as possible.

fingers crossed I guess
Paul
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Home✈️Aircraft🚁HelicopterHelicopter Main Discussion › Strange lockout - one for the electonics guru's
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