Linear motor driven cross table what board to get?

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16 Oct 2019 14:36 - 16 Oct 2019 14:38 #147994 by Samuelx
Hello, I got a linear motor driven crosstable.
motors are ANORAD LC-050-200-D-0-TTR LINEAR MOTOR
It has ALLEN BRADLEY 2098-DSD-010-SE ULTRA 3000 DIGITAL SERVO DRIVES
I have been playing around whit mach3 and step dir
Now I want to move forward
I bought a old PC (Dell T3500) and planing to install LinuxCNC on it

Encoders are sin/cosin type 2000 lines / mm

What boards should I get?
MESA 5i23 or MESA 6i24-25 Or something els?
MESA 7i48 daughter card.

I add a screenshot form motor database and driver info from driver installation guide
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Last edit: 16 Oct 2019 14:38 by Samuelx.

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16 Oct 2019 15:25 #147997 by tommylight
5i25/7i77 for PCI slot
6i25/7i77 for PCI-E
7i92/7i77 for ethernet
7i97 all in one.
There are some others, but i mostly use those above.

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16 Oct 2019 20:30 #148044 by Samuelx
is there any real difference in communication reliability or/and communication speed on ethernet (7i92 / 7i97) vs in computer boards (5i25 6i25)

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16 Oct 2019 22:47 #148056 by tommylight
Not that i have noticed, and i do have plenty of them.
Simple way to choose:
If your electronics and the computer are in the same box, use PCI/PCI-E
If they are not in the same box, use ethernet, makes wiring dead simple, only a single LAN cable.

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23 Oct 2019 22:36 #148640 by andypugh

Samuelx wrote: Encoders are sin/cosin type 2000 lines / mm


Do you intend to connect the sin/cos encoders to LinuxCNC, or do they connect only to the drives?

With most LinuxCNC compatible hardware you would need something like an EXE box to directly connect sin/cos encoders. (I think that the only exception is STMBL)

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24 Oct 2019 21:50 - 24 Oct 2019 21:51 #148756 by Samuelx
I have allen bradley ultra 3000 drivers.
Encoders are connetcted to it.
But the manual says it has
buffered encoder output
unbuffered encoder output
Incremental Encoder Output

buffered motor encoder outputs
"The Ultra3000 is compatible with motors equipped with both
incremental A quad B or high resolution (Stegmann Hiperface ® )
SIN/COS encoders.
The buffered motor encoder outputs use RS-485 differential drivers
and have a maximum signal frequency of 2.5 MHz. The drivers can
drive a 2V differential voltage into a 100 ohm load."

When the incoming encoder feedback on CN2 is a high resolution
(SIN/COS) signal, the drive is capable of generating more than just 4
counts/cycle (as with incremental encoders). The Ultra3000 drive is
capable of breaking the SIN/COS encoder signals into as many as
1024 counts/cycle. So, for example, a 1024 cycle/rev SIN/COS
encoder can result in 1024 x 1024 (high resolution) counts/rev.

Unbuffered Encoder Outputs
The unbuffered outputs available from the drive (CN1-10 through -15)
are tied directly to the incoming (incremental or high resolution)
encoder signals (CN2-1 through -6). The unbuffered outputs are not
filtered or conditioned.

Incremental Encoder Output
Incremental encoder counts are generated in the drive by counting the
(high to low and low to high) transitions of the incoming A and B
encoder signals. In Figure 2.49 the channel A signal has two
transitions, as does the channel B signal, which results in x4
interpolation (4 transitions/line equals 4 counts/line). So, for example,
typical 2000 line/rev encoder output becomes 8000 counts/rev in the
drive. Counts are not directly available at the encoder outputs, only
the A quad B representation.

Can I connect any of these outputs in mesa 7i97 ?
Last edit: 24 Oct 2019 21:51 by Samuelx.

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24 Oct 2019 22:31 #148757 by tommylight
Seems like Incremental Encoder Output should work just fine.

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27 Oct 2019 23:46 #148942 by andypugh
Buffered sounds OK too, I think that 2V is enough to trigger Mesa differential encoder inputs. And that mode offers interpolation to higher counts if required.

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