Messages

891

General Mach Discussion / Re: Allen Bradley Ultra5000 Sin/Cos Encoder? Resolver?

« on: May 03, 2010, 04:19:47 PM »

Hood,

I will probably won't need speeds above 10,000rpm (or may be even 8,000rpm), just wanted to do it the right way and put an encoder that can handle the whole range in case that at some point I will need it. The closest I've found so far were 8,000RPM so the 12,000RPM is sure better!

So you're saying that any motor of the MPL series has an encoder rated to 12,000rpm? Think the MPL are rated up to 5000RPM, so they used quite nice encoders on them. Do you know what make are the encoders? Model?

As far as I understand the motor poles number should have no affect on selecting a commutating encoder, but for some reason Q-Phase encoders do specify the pole count of the motor on their encoders...?

Daniel

892

General Mach Discussion / Re: Allen Bradley Ultra5000 Sin/Cos Encoder? Resolver?

« on: May 03, 2010, 03:46:05 PM »

Thanks Hood. Bad news then

But how do you always manage to find this documents... I thought I've searched through their whole database and haven't found any clue about resolvers.

I think I will have to find an encoder then to replace the resolver. It's not going to be easy - the motor is 13,000RPM and I haven't seen encoders that work at these speeds.

Daniel

893

General Mach Discussion / Re: Allen Bradley Ultra5000 Sin/Cos Encoder? Resolver?

« on: May 03, 2010, 10:37:01 AM »

Yes, the manuals don't mention anything about resolvers. I will try and let you know. It will either work or I absolutely misunderstand the operation of these to feedback devices.

The motor doesn't have any commutation signals, so have no idea how is the commutation done with this motor...? Even with a resolver it must have some hall signals to commutate, doesn't it?

Dan

894

General Mach Discussion / Re: Allen Bradley Ultra5000 Sin/Cos Encoder? Resolver?

« on: May 03, 2010, 09:45:17 AM »

I see, Hood. So no way it would work with a resolver if I connected one? Sorry for the ignorance, but they both seem to output Sine/Cosine wave signal. But I am not sure about the commutation...

Is that Hiperface a kind of motor feedback device? Not really clear from what I've found here http://www.stegmann.com/product/servo/index.html Are you suggesting me to replace the resolver on the motor with one of these?

Thanks,
Dan

895

General Mach Discussion / Allen Bradley Ultra5000 Sin/Cos Encoder? Resolver?

« on: May 03, 2010, 08:05:24 AM »

Hi,

Does anybody know what is a Sine/Cosine Encoder? My Ultra5000 AC servo drive manual says that it supports both TTL encoders and Sine/Cosine encoders. Do they mean by Sine/Cosine encoder that it supports a resolver feedback?

Thanks,
Dan

896

General Mach Discussion / Re: Initial setup - spindle PWM ok, axis PWM not ??

« on: May 03, 2010, 07:21:21 AM »

Sweep,

I am not sure the spindle would work if in simulation mode, but just for the sake of it - you're not in simulation mode right?

Try to put same settings in motor tuning for both the spindle and X axis, then command in the MDI G0 X100 or something. May be the settings are way different between the spindle and X and you're failing to find the right frequency mode on your scope to show the signal.

Dan

897

General Mach Discussion / Re: Initial setup - spindle PWM ok, axis PWM not ??

« on: May 03, 2010, 06:41:05 AM »

Hi Sweep,

Did you check that your X axis is enabled in ports and pins? Also worth checking what has it got in motor tuning.

Are you trying to jog using the keyboard arrows? Do you see the DRO moving?

Dan

898

Show"N"Tell ( Your Machines) / Re: Success! Mini Machining Center under Mach3 control - Video link

« on: April 30, 2010, 03:16:15 AM »

I don't know why I did not think of that  . . .  so . .  I'll just blame Dan  . . . Dan, this is all your fault . . 

Huh... ??!! 

899

Show"N"Tell ( Your Machines) / Re: Success! Mini Machining Center under Mach3 control - Video link

« on: April 29, 2010, 02:48:42 PM »

Other than the axis attempting to move before the lock can release, I don't see a fatal flaw in the process, but I would definitely want to know if anyone else does.

Exactly! This is the main problem and especially because of the requirement to make it "transparent"  to Mach. You got to have something in Mach that would trigger just before it starts sending pulses to the 4th axis. Once it's started sending pulses to the drive it's too late to try and do something on the hardware level to unlock the brake. That is unless may be if you have a servo with an incorporated brake and some clever drive that can take care of it all.

Dan

900

Show"N"Tell ( Your Machines) / Re: Success! Mini Machining Center under Mach3 control - Video link

« on: April 29, 2010, 02:37:59 PM »

I thought you had three modes:
1. Full A axis mode
2. Indexing mode
3. Spindle mode

I don't know where this came from, but it was not from me. I don't recall ever saying 'Full A axis mode' and I really don't even know what that would be.

There is no point in getting into a semantics argument.  There are no defined 'modes' so you can call them whatever you like, but there are only two. There is an A axis and a Spindle axis. One has postion and one does not.  

Sorry, a bad interpretation of mine of your previous post

Dan