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Chris165
06-15-2019, 05:25 PM
I'm getting rid of a machine that has some Fanuc servo motor drives on it that I would like to see if it is possible to power with a D.C. speed controller for a welding rotary positioner. Just need FWD/REV and RPM controls.

I'm not too knowledgable on control and electronics so not sure if it would even be possible.

This is the motor and drive I was looking at.
https://uploads.tapatalk-cdn.com/20190615/222bebfd9f059f3514407ff26554634d.jpghttps://uploads.tapatalk-cdn.com/20190615/ac7cf3dc7f7ea15663d7db73204c77f0.jpghttps://uploads.tapatalk-cdn.com/20190615/39850b6c91cd43bef21a5d491c54d53d.jpg

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MaxHeadRoom
06-15-2019, 11:24 PM
If you just want it as a low rpm positioner you could probabally get away with the 120v option, otherwise to get full rpm you may need 240v.
It has current limit and max rpm pots.
Those are pretty hefty DC brushed motors, it probabally has seen quite a bit of service, so check the brushes for wear first and blow out any carbon dust.
It appears to be a uni directional drive, so if reverse is needed you need a reversing relay on the motor leads.
Just ensure you reverse at zero rpm.
Max..

Chris165
06-17-2019, 10:16 PM
If you just want it as a low rpm positioner you could probabally get away with the 120v option, otherwise to get full rpm you may need 240v.
It has current limit and max rpm pots.
Those are pretty hefty DC brushed motors, it probabally has seen quite a bit of service, so check the brushes for wear first and blow out any carbon dust.
It appears to be a uni directional drive, so if reverse is needed you need a reversing relay on the motor leads.
Just ensure you reverse at zero rpm.
Max..Yes, the slower the better.

Am I correct in the thought that running them slow will not build up excessive heat like a TEFC motor since turning slow and fwd/rev all day is what they do.

I only need one direction of rotation so that should be fine.

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MaxHeadRoom
06-17-2019, 11:49 PM
Generally current is the cause of heat, no problem in running that motor up to its 1500rpm if need be.
Just that you mentioned FWD/REV but generally not required on a welding positioner.
If you ever need brushes, I have a few sets for some of the Fanuc yellow cap.
Max.

macona
06-17-2019, 11:52 PM
Find a drive with tach or encoder feedback otherwise your low speed torque is going to be terrible. I have one that takes an encoder feedback and converts that internally to a tach signal. Then you drive it with an analog input just like a VFD.

MaxHeadRoom
06-18-2019, 10:16 AM
I have used a similar set up as the OP for such as weld positioners using similar KB drives with no problem so far, we used to put the pot in a foot pedal operated type for manual machines.
Also with a weld positioner, the load varies very little.
Max.

Chris165
06-21-2019, 05:59 AM
I have used a similar set up as the OP for such as weld positioners using similar KB drives with no problem so far, we used to put the pot in a foot pedal operated type for manual machines.
Also with a weld positioner, the load varies very little.
Max.That would be nice to have the variable speed built into a foot pedal for any irregularities in the weld joint.

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MaxHeadRoom
06-21-2019, 09:35 AM
That would be nice to have the variable speed built in

You can get industrial foot pedals that have the feature built in as well as the ON/OFF switch versions.
Max.