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HomeRC & PowerAircraftHelicopterRadio - Servo - Gyro - Gov - Batt › gy520 Problems! Help!
04-09-2010 04:29 AM  8 years agoPost 1
socal 3d

rrApprentice

pasadena, ca

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Hey All,

I am flying a Furion with a new Futaba 520/9257 servo combination and get a slow blinking violet light at the end of each flight. Has anyone had this happen to them? The manual states it is a "Offset from neutral". Any thoughts? I did try to rebind with No success.

Thanks!

Steve

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04-09-2010 04:40 AM  8 years agoPost 2
kineticheli

rrApprentice

Turlock, CA

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Have you trimed it out in rate mode yet. I didn't the first time and had a bounce back after piros. After I trimed it out in rate mode the bounce went away and the tail holds very well now.

Citizen #130

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04-10-2010 04:43 PM  8 years agoPost 3
tgo

rrApprentice

HK

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Normally "Offset from neutral" means your Tx rudder stick is different from the time you initialize the gyro. You can confirm this by the following steps.

After your flight and found the blinking violet LED, try move the rudder stick left or right slightly, the LED should goes back to Red and stay steady.

TGO

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09-27-2010 08:12 PM  8 years agoPost 4
Diploid

rrNovice

Miami, FL US

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Normally "Offset from neutral" means your Tx rudder stick is different from the time you initialize the gyro.

I'm seeing this same behavior.

If the explanation above is correct, I don't see how the gyro can distinguish an offset change verses holding the stick off center slightly.

In other words, if it sees a certain value at initialization, then I land and hold the stick left slightly, will it not see the same thing as an "offset change"? How does it know the difference?

And why doesn't holding the stick slightly left after initialization and before the flight not result in the violet light? It's only violet AFTER the flight. Before flying it's red or blue depending on which way it's trying to correct the tail and holding in trim or a slight stick input never results in the violet light.

Anyone have any ideas? TIA

You paid HOW MUCH for that?

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09-28-2010 03:42 AM  8 years agoPost 5
RAK402

rrElite Veteran

Alhambra, CA

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Several of my GY520's behave like this.

It is sensing a slight offset in rudder after you land. TGO got it exactly right-moving the rudder stick one way or the other will sometimes make it go away.

On the other hand, even when the LED is doing this after I land, I have noticed no degradation in flight performance. The tail feels tight and locked from the beginning to the end of the flight.

I am not sure that it matters at all.

I have 12 GY520's in service (in machines from 450's, to 500's, to 550's to 600's, to a .90 sized machine) and all behave brilliantly!

Team KBDD/Compass Team Manger/Experience RC/Team JR Americas/WR Field Rep

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09-28-2010 06:19 AM  8 years agoPost 6
tgo

rrApprentice

HK

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My understanding for this are:-

1. at initialize of the gyro, the gyro will see your rudder stick's neutral position, say 1520uS for Futaba system.

2. May be you have a worn pot in the Tx, or hardware, it never returns to the same position again,

3. or your 520 heated up during flight (it's so small and all electronics will generate heat and trapped inside) and causing a signal drift.

4. Your receiver's output signal drift due to the same reason in 3.

5. Remember, your receiver decode the digital signal (most 2.4GHz system), convert it back to a PPM signal, if somethings goes wrong as time goes by, even you didn't move your stick, the output PPM singal is no longer 1520uS anymore, may be 1522 or 1518, the gyro has some deadband built-in, will not treat this as your command, but just warn you the neurtral position was changed......

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09-28-2010 02:13 PM  8 years agoPost 7
Skaluf

rrVeteran

Champaign, IL

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If you move your trim lever, this will cause this condition, as well as other things. If you flew in normal mode, changed the trim position and then switched back to AVCS it will show this.

The gyro is telling you that the neutral position it saw at power up has changed. To reset that position cycle normal/AVCS switch three times within one second. Alternately power down and power the GY520 back up.

I hope this helps.

Steve Kaluf
Hobbico

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09-28-2010 02:39 PM  8 years agoPost 8
z11355

rrMaster

New England

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it happens sometimes perhaps due to slightly noisy pots in the transmitter or so. after flying there will be an ever so slight difference between calibration value and current value resulting in offset indication

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09-28-2010 05:54 PM  8 years agoPost 9
Diploid

rrNovice

Miami, FL US

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But how would the gyro know the difference between an "offset change" and me landing with one click of trim to the left for example, which I've tried and it didn't cause the violet light.

You paid HOW MUCH for that?

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09-28-2010 06:05 PM  8 years agoPost 10
z11355

rrMaster

New England

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it doesn't know the difference. if you give any offset via stick or trim, it should go violet

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09-28-2010 08:48 PM  8 years agoPost 11
Skaluf

rrVeteran

Champaign, IL

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If you are flying in the AVCS mode, you should not be using your trim levers at all. One click of trim may or may not cause the gyro to see the offset condition. This will depend on how course or fine you have your trim steps set.

Steve Kaluf
Hobbico

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09-29-2010 02:31 AM  8 years agoPost 12
Dr.Ben

rrMaster

Richmond, VA, USA

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Go through the radio and confirm that every single rudder trim for each flight condition is set to zero. Then go through and confirm that none of the revo mixing has gotten turned on by mistake.

If you come up empty handed and the behavior persists, then send the transmitter in and tell the service center to replace the rudder pot (better do all of them while you're there).

This kind of neutral shifting can induce unwanted drifting in the gyro. When it's a very small shift, you may not notice anything in the way the gyro behaves, but if the pot is going south, the problem will get progressively worse.

Ben Minor

PS: It is useful for those of us who try to provide technical support if you fill out the equipment profile in your bio. It'll often help us more quickly zero in on the cause of a problem.

Peak Aircraft/Team Minicopter Team Futaba Team Kontronik USA

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09-29-2010 09:42 AM  8 years agoPost 13
tgo

rrApprentice

HK

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Hi Ben,
I'm using a Futaba T12Z, I have the rudder trim function disabled! So this is not possible to alter the rudder trim inflight!

TGO

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