0-10v Servo Control with 7i76E

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15 Mar 2022 18:35 #237357 by PCW
Replied by PCW on topic 0-10v Servo Control with 7i76E
A 7I83 (6 channel +-10V analog out SSerial connected)
is an option (though a bit overkill with 6 channels)

The 7I76E analog output is not terribly fast as it's intended
for normal spindle control and the isolation limits the PWM
frequency and thus filter bandwidth.

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15 Mar 2022 19:59 #237367 by besriworld
is it possible to make a small board that converts frequency into voltage.
My idea is to load 7i76e_7i76x1_7i77x1D firmware and just make a small board to add 1 fast analog output. But I don't know if this is possible and did anyone do it?
It just takes a long time to buy a new card.

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15 Mar 2022 20:05 #237370 by PCW
Replied by PCW on topic 0-10v Servo Control with 7i76E
You could use PWM (Offset PWM is easiest)
and an Op-Amp filter/buffer

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29 Mar 2022 09:09 #238580 by besriworld
Thanks for the reply !
The driver is: Unidrive sp1404
I look at the manual and I'm not sure there is no step direction controll.

Manual : www.nidec-netherlands.nl/media/2133-freq...s11-0471-0002-11.pdf

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29 Mar 2022 09:31 - 29 Mar 2022 09:31 #238582 by andypugh
It looks like you can use step/dir or quadrature pulses.

The source for frequency slaving mode may be quadrature A/B encoder signals or Frequency and Direction. With the latter care must be taken to
ensure that the D set-up time (10s) is observed or pulses may be lost. The frequency slaving input must be selected as F and D or quadrature to
match the source mode. The input mode is selected by Pr 3.38 which defines the encoder type. The default for source and destination drives is
quadrature A/B mode, unlike previous products which used F and D only.

Last edit: 29 Mar 2022 09:31 by andypugh.

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29 Mar 2022 13:21 #238606 by besriworld
The encoder is connected to this place. Yes, I think the only option is to buy 7i33TA

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29 Mar 2022 13:26 #238607 by andypugh
You can use this input to control the drive speed (and hence position)
Connect the encoder to LinuxCNC and then connect a stepgen to the drive inputs.

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09 May 2022 15:14 #242383 by besriworld
Hello again, everything went wrong. The drivers that accept step and direction one by one stopped working. The manufacturer says that they are locked and cannot be unlocked without a program. It's the driver Parker HID16

Now I need to redesign the dashboard for new drivers. I have three free drivers. But they do not accept step and direction.
I want to make a new MESA configuration. And this 7i76E board should remain for the next project.

Can they work together Mesa 7i93 + mesa 7i48 ?
Is there a ready firmware for this configuration. Thanks!

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09 May 2022 15:30 #242387 by andypugh
The 7i83 might help. store.mesanet.com/index.php?route=produc...83_88&product_id=122 (that can connect to the smart-serial expansion channel)

But you would need to also consider the position feedback part of the equation so something like the 7i48 might be better,

But the 7i48 is not really compatible with the 7i92. You would normally use:

7i92 + 7i77 (note that the 7i77 could also be connected to the header on the 7i76E)

Or

7i97

Or

7i93 + 7i48 (or 7i33TA)

(All assuming that you want to continue with Etthernet as the link, If not then the 5i24 PCI card + 7i48 is an option.)

There are two styles of Mesa cards, 50-pin (HD) and 25-pin (DB)

They both offer advantages and disadvantages. (50 pin have 24 IO pins per header + GND and DB25 have 17 + GND)

You need to decide which way to go fairly early in the process as the card selections are different but overlapping. (there is no Resolver interface for DB25, for example)

Both types support additional Smart-Serial cards connected via CAT5 cables.
The following user(s) said Thank You: besriworld

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09 May 2022 15:39 #242388 by PCW
Replied by PCW on topic 0-10v Servo Control with 7i76E
Yes:

7i93_svst6_6_7i48d.bit
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