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HelicopterRadio - Futaba FASST › Servo ds9254 shakes
04-06-2011 01:46 AM  6 years agoPost 1
George Colby

rrNovice

Greentown,Pa

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Hello,
I have a problem with a 9254 servo shaking in head holding mode on a 401 gyro. My radio is Futaba 7c air/heli. When in STD mode at nor 50% rate there's no shaking but once I scroll over to A mode the servo starts shaking very bad the further the rate is increased. The servo and gyro are brand new and never flown. Can anyone guide me through the correct setup?

Thanks,
George

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04-06-2011 01:48 AM  6 years agoPost 2
tasmanian devil

rrApprentice

DeSoto,Tx.

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You sure you have the 401 set to digital servo?

I do'nt crash,I just rearrange parts.

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04-06-2011 02:07 AM  6 years agoPost 3
Puffy929

rrApprentice

N W Ohio

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turn the gain down till the servo stops shaking.

TRex600Nitro YS 50 JR9303Converted to 2.4 TJ Pro

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04-06-2011 02:12 AM  6 years agoPost 4
dkshema

rrMaster

Cedar Rapids, IA

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Yes -- Turn DS ON. Delay to Zero. When you say gain is set to 50%, is that really 50% gain, or is the channel you're using to control it set to 50%?

Which leads to the real question -- how are you controlling gain, what transmitter, what channel, and what switch on the TX? I'll guess since you said "A", you're using some form of Futaba TX.

Further, the 401 must ALWAYS be started up in Heading Hold mode if you want it to work correctly. When you have correctly initialized the 401, the red LED on the body will come on and will stay on as long as you don't move the stick or the airframe. If it comes up blinking after the power-up initialization, you were a bad boy and tried to start it up in Normal/Rate mode. You'll need to cycle power on the RX, but this time make sure the TX is set to select AVCS/HH mode first.

And just to cover all the bases, a digital servo WILL buzz -- not shake -- but will buzz much of the time when it is at neutral or holding a fixed position, especially if you have some friction and/or binding in your linkage and control setup.

-----

What's that thing in the picture? Seems to resemble a plank...

-----
Dave

* Making the World Better -- One Helicopter at a time! *

Team Heliproz

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04-06-2011 01:15 PM  6 years agoPost 5
BarracudaHockey

rrMaster

Jacksonville FL

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First, in that menu set STD to GY

Then set the gain to A 50 and boot the gyro with the switch that puts the gyro in A or AVCS mode.

Andy
AMA 77227
http://www.jaxrc.com

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