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Help please !!! Servo configuration with stepconf.

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30 Apr 2012 11:18 - 30 Apr 2012 11:25 #19642 by ishman
Hello All !

Can someone please help me to let me know how to configure linked below AC servo drive with stepconf wizard ? Till now I only have these drives and servo motors. And simultaneously I have an ordinary 5axis, 2relay, 4limit switch breakout board to work with.

My problem is I don't know how to calculate driver timing setting and axis setting except that my ball screw pitch is 5mm and its directly driving the axis without any pully and gear.

My drive model is SA3L04C
www.bonmet.com/productshow_eng.asp?id=1506

Many thanks in advance.

My configuration is
Intel Xeon 3.0 ghz dual core
Intel G41
DDR3 2gb

My latency test

with "gzip -c /dev/urandom > /dev/null"
Servo Max jitter = 16350
Base max jitter = 19001
Last edit: 30 Apr 2012 11:25 by ishman.

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30 Apr 2012 11:58 #19643 by BigJohnT
Stepconf is for configuring simple stepper motor driven machines. Pncconf is for configuring servo motor driven machines. I'm not familiar with that drive so I can't advise on that.

Typically a servo drive is fed an analog velocity command +-10vdc and receives feedback via an encoder. The drive gets feedback from a tach generator on the motor.

John

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30 Apr 2012 12:12 #19644 by ishman
Thanks BigJohnT

Then I assume that it's not possible to connect servo drives with an ordinary breakout board which haves only step/dir input connection on it. And I have to go for mesa or vital systems cards. Is is right ?

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30 Apr 2012 12:15 #19645 by cncbasher
these are standard analog input ( 0 - 10v ) servo drives , so require a servo drive interface , rather than a step / direction ( stepper ) interface
you will need a breakout board which gives you analog drive voltages , your best bet is to use a 5i20 / 7i43 with addon analog output interface from Mesanet.com
or the newer 5i25 with 7i77 daughter interface , is a suggestion here .

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30 Apr 2012 12:25 - 30 Apr 2012 12:39 #19646 by ishman
Many thank cncbasher.

5i20 / 7i43 OR 5i25 / 7i77
Is any of these two is enough for me if I want to connect it with external PLC ? Or I should include anything more to interface discrete I/O's with external PLC ?
5i25 / 7i77 looks interesting as it's cheaper then first one.
Last edit: 30 Apr 2012 12:39 by ishman.

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30 Apr 2012 12:41 #19647 by BigJohnT
If you run out of I/O on the 7i77 then you can get a second card to expand your I/O. I'm not sure which card that is, but I'd bet Peter does.

John

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30 Apr 2012 12:56 #19648 by ishman
I checked 7i77 and they offer 48 isolated i/o which is more then sufficient for me.

But their 7i76 board again confused me that it can support step/dir for servo motors and stepper motor as well. While my drive supplier says that it can be run by step/dir cards by connecting pulseinv +- to pulses and signinv +- to Directions. which I tried but motor seems to crackle and stalls during trial jog. it surely spins but at very slow speed no matter which setting I tried.

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30 Apr 2012 13:00 #19649 by BigJohnT
If you have step and direction inputs you could use that but it is better to have a closed loop for servos. Did you tune your drive? Many modern drives have a self tune function once your connected up and centered on your travel you should run the drive self tune if it has one.

John

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30 Apr 2012 13:16 #19651 by ishman
unfortunately it doesn't have self tuning.

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30 Apr 2012 13:22 - 30 Apr 2012 13:22 #19652 by ishman
ok ! I should go to order mesa cards now. It's really professional to have closed loop system.

Is there any major difference between 5i20 and 5i25 ? any advantage and disadvantage between both ?
Last edit: 30 Apr 2012 13:22 by ishman.

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