Messages

191

dspMC/IP Motion Controller / Re: allen bradley bru 200

« on: September 22, 2009, 08:02:20 PM »

Oh forgot, if I remember correctly commutation is by means of absolute encoder, the motors I had have a ABS signal as well as the normal A B I on the encoder.
Hood

That is what looks strange, ABS is just one input, whereas absolute is usually multi-digitial, the rest is ABI differential.
From what I read in the manual, the personality module can be custom programmed by PC and a modem program, they are normally just  pre-set for Reliance motors?
Nosmo.

192

dspMC/IP Motion Controller / Re: allen bradley bru 200

« on: September 22, 2009, 05:40:12 PM »

I am in the process of taking delivery of one picked up second hand, I have been trying to find anyone that has used them with third party motors.
As you may know, they are programmed with a PC through the serial port, they only appear to have ±10vdc analogue control.
I hope to drive a Fanuc servo with it for as spindle motor, I don't see any commutation inputs, Hall or resolver? Do you know if your has commutation feed back.
BTW, These are Reliance Electric units, Rockwell bought them out a while back.
Nosmo.

 

193

General Mach Discussion / Re: Fanuc OT retro

« on: September 16, 2009, 04:13:58 PM »

Could this be the lines for example:

N09900 P 3
N09901 P 0
N09920 P 00101011
....
....

they are more os less 50 lines of N09*********

Thanks

Yes, if you have those you are half way there, for eg the 9921 sets the amount of memory available!
Fanuc's method was to put all the options in the control and they are turned on when you pay for them.
Some, however do need hardware, either external or in the form of an additional card.
Nosmo.

194

General Mach Discussion / Re: Fanuc OT retro

« on: September 16, 2009, 01:49:03 PM »

I have the manuals for the 21, but the parameter manual will just describe the nature of the entry for whatever machine you are working on.
You need the original OEM values.
The other problem is the 9000 option parameters, these are purchased by the MTB at build time.
These turn on things like thread milling or tapping etc.
Nosmo.

195

FAQs / Re: Controller capacitors get HOT

« on: September 16, 2009, 01:43:07 PM »

There can be very high current flowing in to large value capacitors, everytime you fast decel the caps are absorbing the back EMF. High current is flowing  in and out of them.
Whether this is normal on this machine, I could not tell you.
Nosmo.
 

196

Galil / Re: older isa bus galil with mach 3

« on: September 09, 2009, 08:03:56 PM »

If someone were to donate a DMC-1000, I will try and make it work.

Steve

I have a number of DMC-1000 cards, but rather than offering one of mine, it should be in the interest of Galil maybe to come up with one, , if they are made aware of it.
Although a legacy card, it is still being sold by Galil.
If you are willing, I could approach them, or alternatively refer them to you, in order to maybe obtain one on a loan basis?
What say you?
Nosmo.

197

Galil / Re: older isa bus galil with mach 3

« on: September 07, 2009, 11:27:35 AM »

I think the only legacy ISA slot Galil left is the good old DMC-1000, if this is the board you are thinking of, I believe there are previous posts about this and apparently the Mach plug in will not work with these Legacy boards.
Its too bad as they are capable of running a CNC machine.
I especially like the fact you can use standard IDC to term boards or make your own custom interface, rather than the expensive 100 pin I/O the PCI boards use.
Nosmo.
 

198

FAQs / Re: About AC and DC Servo Drive (CNC conversion)

« on: August 29, 2009, 04:54:22 PM »

Another factor in the difference between DC Brushed  and AC or DCBL  servo, Torque being equal, is the motor inertia, taking the windings off the rotor and placing them on the stator reduces the rotor inertia considerably, these factors are taken into account when sizing.
http://www.yaskawa.com/site/dmservo.nsf/(DocID)/NKOE-7TKLD2/$file/PR.DN.01.pdf
http://www.ormec.com/Services/ApplicationsEngineering/ApplicationNotes.aspx
Nosmo.

199

General Mach Discussion / Re: Replacing a Resolver of an AC Servo with an Encoder

« on: August 28, 2009, 04:11:55 PM »

this would be classed as purely an AC Servo as BLDC drives wouldnt be able to run it.

Hood

This would pretty much sum it up, there are none that I know of anyway.
Nosmo.

200

General Mach Discussion / Re: Replacing a Resolver of an AC Servo with an Encoder

« on: August 28, 2009, 10:23:45 AM »

Found where I read it. See bottom of page 26 and 27.

Daniel

Daniel,  Whoever wrote that article is basing his information on very old technology, there has not been a wound rotor AC servo  motor used for many years, for a motor to be made synchronous to the applied frequency, it requires either a permanent magnet on the rotor or energized coils of some kind.
I think the author was mixing induction motor technology with his explanation, an ordinary AC induction motor can never be a synchronous motor, without some other tricks.
Apart from dismantling the motor to prove an AC servo motor has magnets on the rotor, is to back feed the motor shaft by some means and 'scope the three phase stator  leads, you will see a generated three phase, the magnitude of which is dependant on rpm.
Generation will not occur with a solid iron rotor, only by energizing rotor coils, IF it has them.
Nosmo.