ESC32 random disarm

Info and Discussion about the ESC32 hardware and software

Re: ESC32 random disarm

Postby Jdmagoo » Tue Apr 01, 2014 7:32 am

SuperSharpShooter wrote:I just had a flipover crash on takeoff, and I'm wondering if it was due to an ESC32 disarm. It flipped over towards the rear left as soon as I had it 0.5m off the ground. The flight beforehand was fine, and I flew it again afterwards without issue too. I've had a look through the AQ log, but there's nothing obvious I can see in there regarding the cause.

How do we check the disarm code for the ESC? Is there a log for the ESC32, or can you only see the disarm code for the previous disarm?

I only had one cap on the ESC so I'll replace it with two parallel caps. The power and signal lines to the ESCs are quite short - less than 15cm. I'm using PWM in open loop mode.


I had a flip recently whilst it came into land after a mission. The decent speed was set to default in QGS and as soon as it touched the ground it flipped. I suspect it had something to do with one or two ESC's disarming when it touched the ground but I don't really know. I couldn't see anything abnormal in the log.
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Re: ESC32 random disarm

Postby afernan » Tue Apr 01, 2014 7:55 am

@Glen:

disarming is still an issue in AQ, since many people (not so inexperts) still having it. The consequences of a "disarming" are dramatic: big crash (expensive) and it´s dangerous too.

Now, I´ve got not having more this problem, by doing this:
- I have ESC close to FC (In between the center plates. So I have short signal wires
- I use 2x330uF caps. Also 10nF between signal and ground. Not using shielded signal cable.
- I always do a good "current" calibration for that especific conficuration ESC32/ motors /Propellers. THIS IS VERY IMPORTANT. Sometimes I repeat to be sure. This can make the difference of having this issue or not.
- Finally I always do a "full throttle test" in ground with propellers in oposite direction. I move quickly throttle stick during a long time (several minutes) until not a single disarm happens.

Then, and only then, I go to flight outside.

Following this steps you can be sure not disarming problems will happen.

Hope this helps you

Angel
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Re: ESC32 random disarm

Postby Jdmagoo » Tue Apr 01, 2014 8:05 am

afernan wrote:@Glen:

disarming is still an issue in AQ, since many people (not so inexperts) still having it. The consequences of a "disarming" are dramatic: big crash (expensive) and it´s dangerous too.

Now, I´ve got not having more this problem, by doing this:
- I have ESC close to FC (In between the center plates. So I have short signal wires
- I use 2x330uF caps. Also 10nF between signal and ground. Not using shielded signal cable.
- I always do a good "current" calibration for that especific conficuration ESC32/ motors /Propellers. THIS IS VERY IMPORTANT. Sometimes I repeat to be sure. This can make the difference of having this issue or not.
- Finally I always do a "full throttle test" in ground with propellers in oposite direction. I move quickly throttle stick during a long time (several minutes) until not a single disarm happens.

Then, and only then, I go to flight outside.

Following this steps you can be sure not disarming problems will happen.

Hope this helps you

Angel


Hi Angel,

When you say 'full throttle test on ground with props in opposite direction' what do you mean with this? Are you swapping the props around on each motor so they are producing reverse thrust?
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Re: ESC32 random disarm

Postby SuperSharpShooter » Tue Apr 01, 2014 8:50 am

Thanks Angel I will do what you suggest. I hadn't given mine an extreme throttle change test like that.

Jdmagoo, yeah I'd say he means flip each prop, and move them around one motor position so they're all producing reverse thrust.
-Glenn
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Re: ESC32 random disarm

Postby afernan » Thu Apr 10, 2014 9:53 am

Yes. That is. You need to put the propellers such that they produce reverse thrust. I always fix the legs to ground also for safety, and keep myself well away.
You can get strong and quick vibrations induced by the pid control. To avoid that i put a column of books just below one arm, just in contact.
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