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Author Topic: CSMIO-IP/A and max velocity setting?  (Read 3512 times)

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Offline Hood

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Re: CSMIO-IP/A and max velocity setting?
« Reply #10 on: June 29, 2016, 04:39:20 PM »
I was out by 10x :D Error for 500 would be 0.127,mm, still not great though.

Let me know if you want the manual but likely if the connections are different then the drives firmware/internals will be different.

Hood

Offline Davek0974

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Re: CSMIO-IP/A and max velocity setting?
« Reply #11 on: June 29, 2016, 04:45:08 PM »
Thanks, thats a bit better ;)

Yes i have a feeling these drives are pretty specific to the manufacturer, so will have to play safe and stick with current manual, the seller was pretty helpful though so if there is a specific question, I can always ask, but as far as tuning goes the answer was "just enter the motor code"
Bridgeport Mill, Mach3 V062, CSMIO-IP/A controller, AC Servo Drives

Offline Davek0974

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Re: CSMIO-IP/A and max velocity setting?
« Reply #12 on: June 30, 2016, 10:48:21 AM »
I had one of the bigger motors set up today, the following error is better at 256.

I also set the drive to show rpm - they seem to give the ePid fault if it goes above 2950rpm for some reason.

It may be one of the parameters is set too tight in the drive, who knows but in reality I don't think it will matter, i'll just keep away from 100% full speed, 7500mm/min is a bit hairy on a bed thats only 48" long i think.
Bridgeport Mill, Mach3 V062, CSMIO-IP/A controller, AC Servo Drives

Offline Hood

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Re: CSMIO-IP/A and max velocity setting?
« Reply #13 on: June 30, 2016, 05:15:53 PM »
The Chiron has X@550mm  Y@320mm and Z @290mm and it runs 20m/min. When I occasionally crank up the Beaver NC5 and see it running at 8m/min I think it is a tortoise :D

There is a big difference though with the stability of the machines, I could also get the Beaver NC5 up to 20m/min but I reckon it might topple :D, no chance of the Chiron doing that.

I would say somewhere between 6 and 10m/min would be the happy range for a knee mill.

Hood

Offline Davek0974

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Re: CSMIO-IP/A and max velocity setting?
« Reply #14 on: July 01, 2016, 02:22:38 AM »
Thanks, i would go for whatever it feels happy with but I'm not going to waste time trying to get that little extra a the top end, if it only runs at 7000mm/min then thats my limit.

I still have a mountain of battles to win at present - seems the bearings in the screw end plates are wrong and not the correct pre-loaded pairs they should be, i will need to shim them out to give some pre-load without binding like they are at present. The correct ones it seems are about £100 a pair but these will do if shimmed up for a while.

I had to get the Y axis front bracket machined as the bolt holes did not line up, seems the new dog-bone screw mount is slightly longer than the old BP one so the Y axis screw sits a little lower than it should, found a local guy that did it for a reasonable price. If only i had a mill ;)

Customers keep getting in the way with orders too ;)
Bridgeport Mill, Mach3 V062, CSMIO-IP/A controller, AC Servo Drives

Offline Hood

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Re: CSMIO-IP/A and max velocity setting?
« Reply #15 on: July 01, 2016, 04:59:38 AM »
Just remember for best results the drive needs to be set to same, equivalent  value, as motor tuning for motors rpm at 10v.

Hood

Offline Davek0974

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Re: CSMIO-IP/A and max velocity setting?
« Reply #16 on: July 01, 2016, 05:22:13 AM »
Er, pardon ;)


Can you expand a little please Hood :)
Bridgeport Mill, Mach3 V062, CSMIO-IP/A controller, AC Servo Drives

Offline Hood

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Re: CSMIO-IP/A and max velocity setting?
« Reply #17 on: July 01, 2016, 05:38:17 AM »
Ok so whatever you have in Motor Tuning as your max Velocity should really be set as your equivalent Max RPM for 10v in the servo drive.

With your 2:1 and 5.08mm pitch screw then
If you had 3000 set in the servo as the rpm for the 10v command then that would equate to 7620mm/min in Motor Tuning for your Velocity

Now say you want to set Max velocity as 7000mm/min then the RPM for 10v in the servo drive would want to be set to
7000/5.08 x 2 = 2755.9, so 2756 would be ok.


If you do not keep these values the same then you can end up with tuning problems. If they are not too far out then it wont likely be too much of an issue but to give an extreme example to show what I mean.

You have rpm for 10v in drive set to 3000rpm
You have Velocity in Mach set to 3810mm/min

You command a rapid move and the IP-A sends out 10v  but the drive sees 10v and thinks you want 3000rpm but because of the values in motor tuning it really only wants 1500 rpm at the motor. So the IP-A sees the axis shooting off and sends a corrective voltage but the motor hauls back too fast so IP-A again corrects and so on, you end up with an unstable axis.

This makes it extremely hard for you to tune the IP-A and for the IP-A to keep control of the axis.

As said that is an extreme example but always best to keep things in equilibrium.
Hood

Offline Davek0974

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Re: CSMIO-IP/A and max velocity setting?
« Reply #18 on: July 01, 2016, 05:47:44 AM »
Ok so i would need to alter the drive parameters so that 0-10v = 0-2756rpm instead of 0-3000rpm, then set Mach3 to 2756 as well in tuning?

The difficult part is finding that parameter in a Chinglish manual :(
Bridgeport Mill, Mach3 V062, CSMIO-IP/A controller, AC Servo Drives

Offline Hood

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Re: CSMIO-IP/A and max velocity setting?
« Reply #19 on: July 01, 2016, 06:13:21 AM »
For a 7000mm/min Velocity in Mach the rpm in the drive for 10v would be 2756 (with your gearing of 2:1 and pitch of 5.08).

Now as said for a small difference like that then it probably wouldn't be too much of an issue if you still had 3000rpm for 10v in the drive but as you start to get a larger difference from rpm in drive and the equivalent vel in Mach then it can start to cause real problems for tuning.

Hood