Servo Spindle MESA connection

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03 May 2017 12:43 - 03 May 2017 12:44 #92573 by timmert
Hello

I need some help regarding connecting a servo motor / driver to MESA 7i76 card
I'm going to use a servo as spindle because of the feedback.

But I'm not sure how to connect the servo driver to the mesa card.
The MESA card has a separate connector for spindle connections. But I'm not sure what to connect.

MESA card connections:
TB4 PINOUT
TB4 PIN
SIGNAL
1 SPINDLE-
2 SPINDLE OUT
3 SPINDLE+
4 NC
5 SPINDLE ENA-
6 SPINDLE ENA+
7 SPINDLE DIR-
8 SPINDLE DIR+

And copied from the servo/driver manual

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Last edit: 03 May 2017 12:44 by timmert.

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03 May 2017 14:12 #92578 by PCW
Replied by PCW on topic Servo Spindle MESA connection
I looks like that drive can be controlled multiple ways (analog torque, analog velocity, step/dir)
but there is not enough information in the pinout to determine the connections

Do you have a link to the manual for the drive or a drive part number?

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03 May 2017 18:45 #92593 by timmert
Thanks for your reply.
I uploaded the manual to my dropbox (too big to upload on the forum): www.dropbox.com/s/1agkoclhaqj8k4r/JASD%2...er%20Manual.pdf?dl=0

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04 May 2017 03:50 #92617 by PCW
Replied by PCW on topic Servo Spindle MESA connection
It looks like that's a normal servo drive so requires +-10V for analog speed control
Since the 7I76 analog out is unipolar (0 to +10V only) that wont work, so its probably
better to use the drive in step/direction mode (assuming you have one of the 5 7I76 stepgen outputs free)

You could still use the 7I76 spindle enable output to enable the spindle drive

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04 May 2017 07:23 #92620 by timmert
Yes I have unused stepgen outputs
Will I still have spindle feedback/constant surface speed this way?

These pins should be connected to the 7i76 If I'm correct?
36 SIGN+ Direction Positive
37 SIGN- Direction negative
41 Puls-
43 Puls+

Which pin on the driver is for enabling the servo?

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04 May 2017 15:57 #92660 by PCW
Replied by PCW on topic Servo Spindle MESA connection
Yes. you can still have spindle feedback this way

It looks like the default programming of "DI1 negative" is servo-enable
so this could be grounded with the 7I76's SPINDLE ENA signals
to enable the drive

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05 May 2017 12:44 #92702 by timmert
First I connected the servo and driver to check if everything is working.
I can manually test the servo with the controls on the driver. That part is working :) servo turn and on the LCD panel on the driver it shows the rpm, even if I turn it by hand. So the encoder is working.

DIR and PUL connections are wired to the 7i76
Didn't connected the servo/spindle yet. What's the purpose of this connection? Just a start/stop signal?
I started the configuration wizard and added a stepgen for my spindle. But no spindle movement yet.

I'm a complete beginner with drivers, configuration and so on. I don't know if I should configure something else on the driver?

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10 May 2017 15:50 #92967 by timmert
With help from a different forum I got the servo to respond to step/dir :) which is good

But not sure how to configure the servo spindle?

I read different things.
Adding it as an A axis or Spindle during the config wizard. Which one is the right method? Wiki doesn't show any information about it.
Also it seems I need to change the stepgen to velocity mode?

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10 May 2017 18:12 #92979 by PCW
Replied by PCW on topic Servo Spindle MESA connection
Yes, you need to set the stepgen to velocity mode and set the stepgen scale to steps/turn
then the stepgen velocity command must be wired to motion.spindle-speed-out-rps

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10 May 2017 18:26 #92982 by timmert
Ok
And do I need to set it up as A-axis or Spindle during the config wizard?

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