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HomeAircraftHelicopterHelicopter Main Discussion › Weird Phenomenon
01-08-2015 08:55 PM  3 years agoPost 21
AWittleWabbit

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O.C., CA

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Michilito,

I worry some servo companies either cut corners or miss stuff out of lack of experience. Im curious if this is potentially harmful too.

Heli-itis sufferer.

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01-08-2015 09:49 PM  3 years agoPost 22
Jeff polisena

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westpalmbeachflorida usa

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Servos have been doing this as long as I can remember ,move horns,wheels,arms fast and sends power back to devices. Never would have known if no leds were not on anything. LEDs take no power to light so servo is just enough to power when moving motors.

No harm was done to any of my equipment with this .

I stole it ,flew it and gave it back ;)

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01-09-2015 12:34 AM  3 years agoPost 23
EEngineer

rrProfessor

TX

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You'd be amazed how high the inverse voltage spike can be when you de-energize the coil.
Sometimes > 10X the voltage that's energizing it....

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01-09-2015 02:17 AM  3 years agoPost 24
Retired2011

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Lee's Summit, MO

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The servo business needs some good industry standards. I wonder if JR or Futaba servos do that?
I only have JR and Futaba servos...they both do it.

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01-09-2015 02:21 AM  3 years agoPost 25
EEngineer

rrProfessor

TX

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Just tried it on my 800XX....with DSMX sats...but X8 servos...

No LED blinks...

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01-09-2015 02:29 AM  3 years agoPost 26
Retired2011

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Lee's Summit, MO

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I don't get sat. blinks either...just my Ultra-Guard reacting.

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01-09-2015 04:29 AM  3 years agoPost 27
EEngineer

rrProfessor

TX

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IC....using the Kos SBEC with a buffer battery that was switched off....

Different set of conditions on my part...

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01-09-2015 04:31 AM  3 years agoPost 28
EEngineer

rrProfessor

TX

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just my Ultra-Guard reacting
Digital servos, I assume?....

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01-09-2015 05:52 AM  3 years agoPost 29
Aaron29

rrProfessor

USA

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Wait a minute. A diode is one way, right? They told me in skewel that a diode is like a one way check valve.

How can a diode light up from reverse current?

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01-09-2015 06:06 AM  3 years agoPost 30
EEngineer

rrProfessor

TX

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A diode is one way, right?
Yes....only a zener diode works in a reversed "biased" condition...but only at very low current.

An LED can't....

Maybe the external SBECs have charge stored in caps...that provide the voltage to blink the LEDs...somehow....

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01-09-2015 06:07 AM  3 years agoPost 31
EEngineer

rrProfessor

TX

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Not saying that the effect wasn't observed....

Just what mechanism could cause that....

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01-09-2015 01:19 PM  3 years agoPost 32
Retired2011

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Lee's Summit, MO

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My Ultra-Guard LED would blink if I moved one of the JR 8717 servos, Heli Jive internal BEC.
The current must be enough to activate the UG which powers the LED with the UG batt.

I've never noticed a satellite blinking, but never looked for it...I'll check my helis today to see if any of them do it.

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01-09-2015 05:03 PM  3 years agoPost 33
Aaron29

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USA

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OP, can you video this? It'd be awesome to see.

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01-09-2015 09:12 PM  3 years agoPost 34
Mitchilito

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Morehead City, NC USA

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I'll give it try. Stay tuned.

Okay, I cycled the the tail servo a bunch of times and could not get it to repeat. But I did it during the day and it is a bunch brighter out here. It's possible it was faint enough to just be seen in low light.

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01-13-2015 05:39 AM  3 years agoPost 35
Heli Fanatix

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Fountain Valley, CA

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BTW
Careful on turning the servo by hand while not under power. You are actually moving the gears in reverse direction and could actually damage a servo.

I myself did it in the past and never had an issue. But was told by "Reliable Sources" not to do that. Refrain from moving servo horn while not under power. If you want to test it, put some pressure with your thumb on the horn and move it under power. The resistant to the horn would be sufficient to test for strip gears.

LOL ... remains me of my Rookie Days!

* That's feedback from the servo motor making current. Nothing to be alarm. Just a by-product.

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01-13-2015 05:49 AM  3 years agoPost 36
EEngineer

rrProfessor

TX

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On a crashed servo?

Hoping that there's no gear strip.....

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01-13-2015 05:56 AM  3 years agoPost 37
Heli Fanatix

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Fountain Valley, CA

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If it's crashed, and the servo is stripped:
- you will hear the motor keep on spinning

if it's crashed and not spinning,
- than use method I describe earlier to test the servo

The goal is to make sure the gears are not strip. If while testing, you find some stops the gears are clicking louder, but not stripped. There is a good change the gears have been ever so slightly bent. Just take apart and reassembled with some servo lube and you are good to go (this is for metal gears).

* for plastic gears, save them for your toast since they are made of butter!

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01-13-2015 06:23 AM  3 years agoPost 38
EEngineer

rrProfessor

TX

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If one crashes like I do, the servos are fubar'd....

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HomeAircraftHelicopterHelicopter Main Discussion › Weird Phenomenon
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