Messages

11

CS-Lab / Re: IP-A and Servo drives, voltage matching...

« on: November 07, 2016, 12:24:52 AM »

ah bummer about the Chinglish... Some ideas for you:

Do you have a oscope? If yes you should verify the amps are seeing tachometer feedback from the servos.
Verify your encoders are 10k count or is that 10k edges? Remember that a 10k encoder would provide 40k edges which is what the IP-A cares about. That's a lot of precision!
You could also remove a belt from one of your servos and run it with a fixed DC voltage to the amp. As an example, +5vdc should spin the servo at 1500 RPM clockwise. If this is not the case you need to futz the settings for the amp. You'd need an oscope to look at the tach signal to measure RPM.

Is this a new machine your building or is it a retofit?

Mike

12

CS-Lab / Re: IP-A and Servo drives, voltage matching...

« on: November 04, 2016, 10:19:25 PM »

Dave,

Most closed loop servo systems utilize amps that have tachometer feedback from the motors. Many have amps with encoder feedback as well. Also, the IP-A control can compute the RPM of the motor based upon encoder feedback. This is how my machine works. I am running at about 175imp for my rapids even though the machine is capable of running at 200ipm rapids based upon max RPM for my servo motors. So, to directly answer your question, your settings should be fine as long at your amps are getting proper tachometer feedback from the motors and as long as the CSMIO-IP/A is getting proper encoder feedback.

The automatic PID tuning worked really well on my machine. You should run the auto-tune first and see if you get good results. For me, good results were errors less than 5 encoder pulses. Make sure your amps are in good tune to start with, otherwise you will never get good results from the CSMIO/IP-A autotune.


Hope this helps!
Mike
 

 

13

CS-Lab / Re: Version 066 versus 062...

« on: April 19, 2016, 02:49:14 PM »

Thanks Ger21,

Your screenset looks cool. Would like to give it a try.... I have a 1920 display and the "factory" screenset looks crappy scaled to 1920. Intrigued by your tool length finder as well.... Anyone using something like this with CS-Labs on a knee mill? I can't rely on open circuit condition between tool and table like you can. I guess an insulator for the z finder plate would solve that...

Mike

14

CS-Lab / Re: Version 066 versus 062...

« on: April 18, 2016, 06:43:13 PM »

Thanks Hood, Tweak,

Both issues I was seeing have gone away with V.062. The safe Z settings are respected in machine coordinates. The soft limits work now and the behavior is different. Now when I enable servos I can't move any axis until I turn soft limits off which makes sense because the machine has no idea where it's at. This is also good since it serves as a reminder to reference the machine. After I reference the machine I can enable soft limits and they are respected! Thanks so much Hood! BTW, downgrade was easy as per advice from Tweak. Thanks!

Mike

15

CS-Lab / Version 066 versus 062...

« on: April 14, 2016, 01:00:07 AM »

Curious about a post I saw from Hood regarding bugs in build 066... I'm using that build and I have a two issues.

1.) Soft limits don't work! They don't work when jogging with my CS-Labs MPG pendant and they don't work on tool change! WTF???
2.) Safe Z ignores the fact I checked the "use machine coordinates" and only uses work coordinates!

Others?

Wondering if I should try 062... If I go back to 062 can I keep my settings (XML file)?

Mike

16

CS-Lab / Re: e-stop circuit IP/A

« on: February 14, 2016, 08:55:08 PM »

I had the mistaken idea that the e-stop switch on the MPG would work through the CAN buss via the servo enable output. Nope, it's just a switch on the MPG that must be wired up to your e-stop circuit. Thought that might be tripping you up as well... Thanks go the Hood for helping me with that issue.

Mike

17

CS-Lab / Re: e-stop circuit IP/A

« on: February 14, 2016, 08:06:28 PM »

Don't know a thing about your delta drives but the diagram looks correct. Are you by chance using the e-stop switch on the cs labs MPG?

Mike

18

CS-Lab / Re: IP-A and Linear Scales / Encoder not directly on motor - how?

« on: January 25, 2016, 08:37:53 PM »

Nice job on the retrofit install, looks neat and tidy despite cramped quarters. Results look good!

Mike

19

CS-Lab / Re: IP-A and Linear Scales / Encoder not directly on motor - how?

« on: January 19, 2016, 12:56:26 AM »

Chaz,

Your mill looks like a real gem. Didn't recognize the original control, is it a Fanuc? Also, who manufactured the mill? Again, looks like a gem of a machine. Looking forward to seeing the results of your retrofit! The link to the air bearing lathe is fascinating. Thanks for sharing that.

Mike

20

CS-Lab / Re: IP-A and Linear Scales / Encoder not directly on motor - how?

« on: January 09, 2016, 12:30:53 AM »

Chaz,

The config you describe should work fine. I have a similar config in that servo amps receive only tach feedback from servos. On my config encoders are on the servo motor shafts however I see no reason why your config should not work. Just compute the steps/inch or steps/mm correctly according to the location of your encoders. Since you have 2000L encoders they provide 4 edges per pulse or 8k/rev edges. If encoders are on ball screws directly you simply divide 8k/pitch to arrive at the correct scaling. On my machine I have .2"/rev pitch so I would calculate 8k/.2" to get the correct scale. The scale is entered In Mach under Config-->Motor Tuning.

In theory it may be more accurate to have encoders directly on ball screws if, like my machine, screws are driven by belts. It would seem that belts stretching could affect the accuracy of my machine. If however the encoder is fixed to the screw then belts could not affect accuracy. Does this make sense?

Good Luck!
Mike