Choosing servo encoders for Mesa 5i20 and D510MO

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21 Jun 2011 16:22 #10712 by andypugh
machete wrote:

I am planning to connect 7i29 directly to my servo motors (110V 6.5A 1000rpm 5.2N\m ) but they do not have encoders.


Did they ever have encoders?
What feedback do they have? Tachometer? Resolver?

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21 Jun 2011 17:45 #10720 by machete
andypugh wrote:

I think that this encoder might have differential outputs, and is cheap:
www.slidesandballscrews.com/hkt300635301...-p-494.html?cPath=88
The data sheet uses an "E" as the last code letter to identify voltage output, so perhaps "L" is line driver?
Note that in that encoder model the 1000 and 1024 line versions do not have an index (Z) line.


It's not such big difference in price for me, and i was thinking about 2000-3000 lines, like on "serious" servo drives (Siemens etc). Why i should have less lines if i can choose more?

And by the way - index line (Z) is it really necessary thing?

Did they ever have encoders?
What feedback do they have? Tachometer? Resolver?


Of course - motors have tachometers, but only for speed control - positioning is making by old "made in USSR" "inductosyn" (linear encoders on machine axis). It is a lot more expensive to buy oscillator+amplifier, than change it to "standard" encoders fitted to motors.

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22 Jun 2011 11:59 #10764 by machete
I am searching for encoder, and usually i can find output type "Output Form: Line Driver" - is that mean differential encoder?

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22 Jun 2011 14:30 #10767 by PCW
Yes, that's common terminology for differential outputs. You can also check that the connections incllude
true and complemented outputs for A,B,Z. Often the complemented output have a slash character prefix:

A
/A

B
/B

Z
/Z

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22 Jun 2011 15:21 #10771 by machete
PCW wrote:

Yes, that's common terminology for differential outputs. You can also check that the connections incllude
true and complemented outputs for A,B,Z. Often the complemented output have a slash character prefix:

A
/A

B
/B

Z
/Z


ÎÊ I thought so! Thanks a lot!

And the last question: index line (Z) is it really necessary thing?

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22 Jun 2011 15:55 #10774 by PCW
Not necessary, but a good thing if you want accurate homing (homing to index is within 1 encoder count)

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22 Jun 2011 17:25 #10781 by machete
Now it's all clear for me!
Thank you so much!

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23 Jun 2011 15:48 #10818 by machete
We have an offer to buy such encoders:

Autonics (Korea)
lines: 2500 3pcs + 3000 1pcs (what they have in stock in Russia)
size 40mm
hollow shaft
good price

3pcs with 2500lines is OK, with "Line driver".
But that one which have 3000 lines left only with "Voltage output":



I plan to put 2500 to XYZ, and 3000 to A (rotary table).

How do you think is it OK for screened cable < 4m?
Or we should find 4th encoder with "Line driver"?
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