Servo Freq

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dkpodder
Posts: 10
Joined: Wed 10. Aug 2022 8:45:54

Hi,

Upgrading servos to KST BLS915 V8, I'm just about to try a 760us cyclic setup.
The servo programming tool takes Upper/Neutral/Lower settings, what is the upper and lower numbers?
Do anyone know if theese servos do more than 333Hz, and do I need to select the 20_k in the servo programming tool?

Best regards
Mattes61
Posts: 628
Joined: Wed 21. Dec 2016 15:13:38
Location: Germany

Hello,
this servo can only 333Hz and neutral signal at 1520 µs , why do think it can 760 µs ?
With the KST1-Tool you can only set the neutral position and the left and right endpoints.
The only information I found for KST1-Tool is in German, look at this:
Screenshot 2023-11-11 124112.png
Servoinformation:
Screenshot 2023-11-11 130220.png
dkpodder
Posts: 10
Joined: Wed 10. Aug 2022 8:45:54

Mattes61 wrote:Hello,
this servo can only 333Hz and neutral signal at 1520 µs , why do think it can 760 µs ?
With the KST1-Tool you can only set the neutral position and the left and right endpoints.
The only information I found for KST1-Tool is in German, look at this:
The attachment Screenshot 2023-11-11 124112.png is no longer available
Servoinformation:
The attachment Screenshot 2023-11-11 130220.png is no longer available
Specs makes me think so:
IMG_2746.jpeg
IMG_2747.jpeg
ZeXx86
Site Admin
Posts: 12833
Joined: Mon 29. Apr 2013 16:06:44
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With 760us servo is not faster actually. Technically it could have lower precision.
Theoretical speed improvement is with increased frequency. But here changing neutral value will not help. So you can leave 1520 and 333Hz.
Spirit System developer
Mattes61
Posts: 628
Joined: Wed 21. Dec 2016 15:13:38
Location: Germany

Hello,
really interesting, different languages different information ?! Unbelievable !
I find that strange...

In the german manual there is no information about the change of mid signal...

I think the only secure information is directly from KST or maybe an other user has this type of servos and changed the mid signal to 760µs -
dkpodder
Posts: 10
Joined: Wed 10. Aug 2022 8:45:54

ZeXx86 wrote:With 760us servo is not faster actually. Technically it could have lower precision.
Theoretical speed improvement is with increased frequency. But here changing neutral value will not help. So you can leave 1520 and 333Hz.
ok, wouldn’t 760/560 be an improvement to 1520/333?
I know it would cause less resolution, but would the increased freq be worth anything?
ZeXx86
Site Admin
Posts: 12833
Joined: Mon 29. Apr 2013 16:06:44
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Yes, 560Hz will help. I can see this is supported too now.
Spirit System developer
dkpodder
Posts: 10
Joined: Wed 10. Aug 2022 8:45:54

ZeXx86 wrote:Yes, 560Hz will help. I can see this is supported too now.
Thank you. So you would suggest going for 760/560?
Wat will the low and high value be when going for 760us?
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