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Author Topic: Servio motor Delta adas b2 Software and electronic gear ratio  (Read 9990 times)

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Re: Servio motor Delta adas b2 Software and electronic gear ratio
« Reply #60 on: March 24, 2018, 11:31:09 AM »
Hi there

Yes possibly there are a lot of scenarios that could work, but from the equation that I provided to you if you choose to set P1-44 ,and P1-45 both to an equal Number,
Then you are forcing the servo to run with an accuracy of .0001 mm, which is kind of Unreal.

Travel   175 mm
Reducer  10:1
Pulse /Revolution 17 Bit   160,000 
Desired accuracy      .001  mm

Gear Ratio = 160,000/(175/.001)*10/1=10     off course it is 9.41


Regards
jhonansaro
Re: Servio motor Delta adas b2 Software and electronic gear ratio
« Reply #61 on: March 24, 2018, 03:04:42 PM »
Hi,
the catch is that with an encoder count of 160,000 and no electronic gearing, that is numerator equal denominator then at 685 rpm the pulse rate
would be 1.82 MHz which is totally unrealistic. The evidence you have is that your controller can handle about 18kHz, a factor of 100 too slow!

Craig
My wife left with my best friend...
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Re: Servio motor Delta adas b2 Software and electronic gear ratio
« Reply #62 on: March 25, 2018, 11:58:24 PM »
Hi,
just re-reading your post, you may note that the default encoder  is 2500 ppr or count of 10,000 per rev.
You could program it to 40,000 ppr or 160,000 count per rev but why? You gain a whole bunch of resolution
which you can't use. Don't bother with it....an encoder count of 10,000 gives you plenty as is and should be in
the sweet spot for signaling if only the controller would play ball.

Has the supplier of the controller come back to you yet?

Craig
My wife left with my best friend...
     and I miss him!

Offline TPS

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Re: Servio motor Delta adas b2 Software and electronic gear ratio
« Reply #63 on: March 26, 2018, 12:09:01 PM »
You could program it to 40,000 ppr or 160,000 count per rev but why?

just to see, that it is also not working.
anything is possible, just try it.
if you find some mistakes, in my bad bavarian english,they are yours.

Offline ger21

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Re: Servio motor Delta adas b2 Software and electronic gear ratio
« Reply #64 on: June 06, 2019, 12:01:56 PM »
Hi,
still trying to digest the details but that encoder count doesn't sound right.
A 17 bit encoder I think has a count of 131,072 per rev. Double and triple check the manual
about that count number.


Craig

Sorry for digging up an old thread.
I'm getting ready buy a set of these, and was confused about the 17 bit encoder count. Yes, what I've read tells me it should be 131,072, but everything I see tells me it's 160,000. Including the spec sheet from Delta.
I guess they use "17 bit" as a ballpark value? It's actually a little higher, but much less than 18 bit would be???

Also, I think that P1-46 is a configurable encoder count output, not the actual encoder count used by the drive.
« Last Edit: June 06, 2019, 12:03:55 PM by ger21 »
Gerry

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Re: Servio motor Delta adas b2 Software and electronic gear ratio
« Reply #65 on: June 06, 2019, 03:00:32 PM »
Hi Gerry,
I recall being confused by this at the time this thread was current.

I seem to recall coming to the conclusion that there is 131,072 lines and therefore with quadrature 524288
counts per rev. In effect the encoder count is synthesized from this potential. If memory serves the default
configuration is 10,000 count per rev. So for all the extra resolution which the servo is capable is discarded,
which is still 2.16 arc min.....plenty fine enough for me.

The problem that OP had here, aside from not understanding electronic gearing, was that he was using a 'Canadian
made SmoothStepper'.......bulls*********t.......a Chinese made rip-off of a SmoothStepper. I recall being bemused that this
guy had spent big dollars to get four 750W servos and drives, huge overkill for a hobby machine, and yet wouldn't spend
$180 to get a genuine Ethernet SmoothStepper to actually get the best out of them.

Craig
My wife left with my best friend...
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Offline ger21

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Re: Servio motor Delta adas b2 Software and electronic gear ratio
« Reply #66 on: June 06, 2019, 03:30:18 PM »
Quote
I seem to recall coming to the conclusion that there is 131,072 lines and therefore with quadrature 524288
counts per rev. In effect the encoder count is synthesized from this potential. If memory serves the default
configuration is 10,000 count per rev. So for all the extra resolution which the servo is capable is discarded,
which is still 2.16 arc min.....plenty fine enough for me.

I think your mistaken, as it clearly says on the image I posted 160,000 ppr.
Gerry

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Re: Servio motor Delta adas b2 Software and electronic gear ratio
« Reply #67 on: June 07, 2019, 02:56:34 AM »
Hi,
well how do you explain it then?

Craig
My wife left with my best friend...
     and I miss him!
Re: Servio motor Delta adas b2 Software and electronic gear ratio
« Reply #68 on: June 07, 2019, 03:23:11 AM »
Hi Gerry,
I discussed this in reply #7 of this thread.

The parameter P1-46 allows you to set the lines per rev, the range is 4 to 40,000. At the upper end, ie 40,000 lines
equates to 160,000 counts because of quadrature.

Craig
My wife left with my best friend...
     and I miss him!

Offline ger21

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Re: Servio motor Delta adas b2 Software and electronic gear ratio
« Reply #69 on: June 07, 2019, 06:59:18 AM »
I think that P1-46 is to configure a digital output, not the actual encoder count used by the drive.

I found a quick start guide that states that there are 160,000 counts. If P1-46 defaults to 2500, then this guide would be incorrect if P1-46 actually set the encoder count that the drive uses.

https://www.damencnc.com/userdata/file/1559_ASDA-B2_Quick_Start_Guide.pdf

If you could change the resolution with P1-46, then why would you need electronic gearing?

I'll have to do some testing when I get one.
Gerry

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