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Author Topic: Allen Bradley Ultra5000 Sin/Cos Encoder? Resolver?  (Read 23444 times)

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Offline Dan13

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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

Offline Hood

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Re: Allen Bradley Ultra5000 Sin/Cos Encoder? Resolver?
« Reply #1 on: May 03, 2010, 08:57:55 AM »
Nope, its the intelligent encoders that are fitted to some of the Allen Bradley motors. I have them on the MPL motors I use on the spindle of the mill and Lathe.
Do a search for Sick Stegmann  Hiperface.

Hood

Offline Dan13

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Re: Allen Bradley Ultra5000 Sin/Cos Encoder? Resolver?
« Reply #2 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

Offline Hood

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Re: Allen Bradley Ultra5000 Sin/Cos Encoder? Resolver?
« Reply #3 on: May 03, 2010, 10:30:15 AM »
Are you suggesting me to replace the resolver on the motor with one of these?

Thanks,
Dan

Nope, simply saying to you that the Sine Cosine inputs are for a Sine/Cosine encoder. You can try and hook up the resolver if you wish, if it works I would be very interested but from reading the manuals for the Ultra 3000 drives and the UltraWare software it seems to me it is not for a resolver.
Hood

Offline Dan13

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Re: Allen Bradley Ultra5000 Sin/Cos Encoder? Resolver?
« Reply #4 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

Offline Hood

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Re: Allen Bradley Ultra5000 Sin/Cos Encoder? Resolver?
« Reply #5 on: May 03, 2010, 10:51:19 AM »
The commutation with the intelligent encoders is via a serial signal (Data + and Data -) not a clue about the resolvers I am afraid.
Hood

Offline Hood

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Re: Allen Bradley Ultra5000 Sin/Cos Encoder? Resolver?
« Reply #6 on: May 03, 2010, 01:41:07 PM »
Daniel
The very last line on this page would seem to confirm what I thought.
http://rockwellautomation-test.custhelp.com/ci/fattach/get/27879/1247153771

Hood

Offline Dan13

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Re: Allen Bradley Ultra5000 Sin/Cos Encoder? Resolver?
« Reply #7 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

Offline Hood

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Re: Allen Bradley Ultra5000 Sin/Cos Encoder? Resolver?
« Reply #8 on: May 03, 2010, 04:07:19 PM »
The max operating speed of the SRM intelligent encoders on the MPL motors is 12,000rpm so even that falls short.

Not sure if one of the resolver to encoder boards would handle that kind of speed and then would the drive handle it is another problem.

Hood

Offline Dan13

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Re: Allen Bradley Ultra5000 Sin/Cos Encoder? Resolver?
« Reply #9 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