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Home✈️AircraftMulti-Rotore-Multi-Rotor Main DiscussionOther › Motor losing power in Gaui 500X
04-02-2012 08:57 PM  9 years ago
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lubepaso

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Milan, Italy

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Motor losing power in Gaui 500X
I built a stock Gaui 500X with a FY-91Q GPS Controller on 2S Lipo
It flew great until I decided to assemble a dedicated camera gimbal and move to 3S Lipo.
The unit now lifts off and, after a few seconds, the rear left motor loses power and the ship falls reversing on that side. If I start again, same story.
I also put a BEC to avoid overload of the ESC, but nothing changed. The FY-91Q seems to work well (no malfunction LED on).
Any suggestion?
Thanks
Luigi
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04-05-2012 12:22 PM  9 years ago
lubepaso

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Milan, Italy

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Anyone?
Thanks
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04-05-2012 06:03 PM  9 years ago
HansAuf

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Gainesville, Florida, USA

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Reprogram your throttle endpoints for each ESC individually. Look in the ESC manual to see how to do this.
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04-08-2012 07:40 PM  9 years ago
lubepaso

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Milan, Italy

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tried to reprogram the ESC to the default values, but nothing changed.
Anyone experienced failures in Gaui 18A ESC? What I found strange is that before adding the camera gimbal and changing then from 2S to 3S the ESC started to show problems, and only after some seconds of flight.
Luigi
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04-08-2012 10:42 PM  9 years ago
Pellicle

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New York

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Default values will not address the ESC end point adjustment. I have had a esc lose end point probably due to something I did. Do your motor start to spin up at the same time?

There is also a possibility the low voltage lipo protection is kicking in too early. I can't remember if this can be shut off on the Gaui ESC but you might try that or decreasing the cutoff voltage.

I also had a similar issue on one quad where at time it flew fine and after some random amount of time would drop. It turned out the very thin esc/ motor wires were broken at the point where the solder from the bullets ended. Apparently some flexing over time caused a fracture. The shrink wrap kept all together but vibration would cause a intermittent and boom down she went. Took a while to find this. Its a bit more of a pain when the ESC is in the boom! Of course any point in the wiring to the ESC with a similar connection issue could cause such a problem including the signal and power leads to the ESC. Might warrant some bench testing were you can vary and isolate components.
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04-09-2012 04:55 AM  9 years ago
gtxkid

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Gulf Breeze Florida

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You can plug in one of those lipo checkers that has the different color LED's on it and leave it in while in flight and or testing.
There real cheep.

But first make sure you have not killed the lipo's and then get a new ESC coming.

Swap it out on the bench with another one and test it on the ground.
Isolate the problem.
1 thing at a time.

Do not fly it anymore till you can do a complete load test on the ground.

Watch temps on stuff.

Was that motor crashed and maybe bound up pulling a lot more amp draw.
Futaba 14Mz / 1300mm Multi rotor / Logo 10
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04-09-2012 04:54 PM  9 years ago
lewma

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San Diego, CA

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I had the same thing happen yesterday on my 330x. Turns out my battery was running low. As soon as I used a fresh battery it was up flying fine again.
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