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HomeAircraftHelicopterRadio - Servo - Gyro - Gov - Batt › Frame rate of an S9254 please?
04-29-2010 02:32 PM  8 years agoPost 1
carbonhead

rrApprentice

Gwent

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OK, I give up.

I've been looking an hour now to see if I can find the frame rate of my S9254 so I can set up my GY520. I've looked here on RR, Futaba's site

http://www.gpdealera.com/cgi-bin/wg....pgm?I=FUTM0224

and all over the net. I think it's just as quick to ask here.
Thanks.

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04-29-2010 03:20 PM  8 years agoPost 2
Heli 770

rrProfessor

USA.

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1520.

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04-29-2010 03:49 PM  8 years agoPost 3
Climax

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West London, United Kingdom

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They will run at 333Hz (or 3ms if you prefer).

However, I believe a GY401 (for which they were originally designed to be used with) ran them at 270Hz.

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04-29-2010 04:13 PM  8 years agoPost 4
Four Stroker

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Atlanta

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For the GY520 set it to the 1520 us center digital setting. The standard default setting.

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04-29-2010 07:59 PM  8 years agoPost 5
carbonhead

rrApprentice

Gwent

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Thanks guys

I've now bought the gyro and got the instructions in my hand. I see the 9254 is in the listing and clearly says its 1520

Thanks again

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04-30-2010 02:06 AM  8 years agoPost 6
TMoore

rrMaster

Cookeville, TN

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1520 isn't the frame rate, that's the centering pulse. The frame rate is as was stated earlier; 300Hz or better.

TM

Delayed Response Operator Not Engaged
AMA SECTION 336 = Good
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04-30-2010 03:22 AM  8 years agoPost 7
Four Stroker

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Atlanta

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The GY520 instructions page 17 gives three choices:

1) Digital 1520 uS Servo - default
2) Digital 760 uS Servo
3) Analog Servo

The actual corresponding frame rates are buried on page 8 in the specifications.

1) 280 Hz
2) 560 Hz
3) 70 Hz

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04-30-2010 08:42 AM  8 years agoPost 8
Climax

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West London, United Kingdom

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Looks like the 401 probably has a 280Hz frame rate, not 270Hz as I suggested earlier...

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04-30-2010 10:28 AM  8 years agoPost 9
carbonhead

rrApprentice

Gwent

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1520 or 300Hz, the setting is one blue flash, job done, thanks

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04-30-2010 01:49 PM  8 years agoPost 10
BarracudaHockey

rrMaster

Jacksonville FL

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Like Terry said, they are two different things.

Frame rate is the amount of position updates per second that the servo amplifier can accept.

Centering pulse is with witdth of those pulses to drive the servo to center.

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

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04-30-2010 02:44 PM  8 years agoPost 11
TMoore

rrMaster

Cookeville, TN

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There is a tutorial file that explains the difference in analog and digital servos that was written a few years ago by a Futaba tech at Ripmax in the UK. It's a good basic primer on the whys and hows of digital servos.

Here is a link: http://www.futaba-rc.com/servos/digitalservos.pdf

TM

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Drones = EVIL

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04-30-2010 03:18 PM  8 years agoPost 12
Richardmid1

rrProfessor

Leeds, England

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The instructions for the 401 say 270Hz.

60% of the time, it works every time!

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04-30-2010 03:50 PM  8 years agoPost 13
Climax

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West London, United Kingdom

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With respect to the 9254 frame rate, I imagine that it will cope with any value up to 333Hz... i.e. 270Hz, 280Hz, 333Hz etc.

It may well go faster, I might test it at 560Hz, although in practice this may shorten its life? As I recall Futaba kept quiet about the fact the 9256 could run at 560Hz, until of course they released the GY-520. Previously we had all used this servo with a maximum frame rate of 333Hz.

I know that the 9254 will happily work at 333Hz as I've used them at this rate with home-made stuff and have never had a problem. I wonder why Futaba chose to configure the 401 to run them at 270Hz, perhaps to extend their lives?

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04-30-2010 08:16 PM  8 years agoPost 14
Four Stroker

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Atlanta

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It's probably just a convenient clock multiple.

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05-01-2010 02:43 AM  8 years agoPost 15
Furious Predator

rrProfessor

Kitchener, Ontario, Canada

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you will be able to select narrow and wide pulse width on the gyro, the 9254 uses the wide, thats all you need to know. the 9251, 9256, and bls251 use the narrow pulse width.

Shawn
Team Leisure-Tech
Team HelixRC

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