*****FIXED!**** Motor sluggish to respond, turns the wrong way sometimes.

Stacy E. Apelt - Bladesmith said:
Since he is running a VFD, it better be a 3Ph motor. I would look for a bad leg or a short somewhere. I would start at the plug.

Just a question, but is the disc grinder motor the same HP as the 2X72 grinder motor?
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Not Necessarily.. Several companies make single phase VFD's, I use them quite often, I prefer them to motor starters or motor control centers.
They run cool and take up much less space as well as allowing soft starting and speed control without changing sheaves out..
I do electrical controls work for a living, I have 24 years experience at it..

https://www.automationdirect.com/adc/Overview/Catalog/Drives/GS1_(120_-z-_230_VAC_V-z-Hz_Control)
 
All of the drives in your link say single phase in, three phase out? If you have a way of running single phase motors on a VFD please share as that would be incredibly valuable to me and I'm sure others.
 
Shooter.762 said:
Not Necessarily.. Several companies make single phase VFD's, I use them quite often, I prefer them to motor starters or motor control centers.
They run cool and take up much less space as well as allowing soft starting and speed control without changing sheaves out..
I do electrical controls work for a living, I have 24 years experience at it..

https://www.automationdirect.com/adc/Overview/Catalog/Drives/GS1_(120_-z-_230_VAC_V-z-Hz_Control)
Click to expand...

For most machines in a knife maker's shop, a single phase in, three phase out VFD is much more efficient and cost effective, and serves the same purpose.
 
kuraki said:
All of the drives in your link say single phase in, three phase out? If you have a way of running single phase motors on a VFD please share as that would be incredibly valuable to me and I'm sure others.
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Yeah, I prefer the 3 phase output for the simple reason I can reverse the motor. I was using these to pull belting into place in mines and quarry's and I could reverse the
motor while running it off of a smaller generator in the field.
https://www.wolfautomation.com/manufacturers/leeson
https://www.wolfautomation.com/blog/vfds-for-single-phase-motors/
http://www.leeson.com/Products/products/catalogs/AC Controls/FHPseries120.pdf
These are made by Leeson and they are selectable output via jumpers for single and 3 phase and run off single phase input.
These may work for you if you want single in and out but if you go single in and 3 phase out the motor will run both directions.
These have on board pots for speed and accel and decel ramps as well as boost and torque limit..
They get good reviews but I have not used these single in and single out drives made by Leeson, I have only used the Automation Direct ones personally..
 
Which ones from Automation Direct are single out? Or are you saying their micro drives that are listed as three out can be configured for single out?
 
kuraki said:
Which ones from Automation Direct are single out? Or are you saying their micro drives that are listed as three out can be configured for single out?
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I wouldn't even bother with a single phase out VFD. For the HP a typical grinder or other machine tool would use, they're generally quite expensive (like, you could probably buy two or three 1in/3out drive AND motor setups for what one 1in/1out drive costs), and they're not nearly as efficient. IIRC, it "chops" the AC signal to control speed, and you'll be limited on speed control much more than a 3 phase VFD. I want to say torque would be an issue as well, but don't quote me on that.

You're closest option for all single phase would be DC motors and controls, but your best bet is the standard VFD with a 3phase motor, IMO.
 
Ah ok. If they're that expensive it's not worth it just to use the 1ph motors I have laying around.
 
knife to a gunfight said:
I wouldn't even bother with a single phase out VFD. For the HP a typical grinder or other machine tool would use, they're generally quite expensive (like, you could probably buy two or three 1in/3out drive AND motor setups for what one 1in/1out drive costs), and they're not nearly as efficient. IIRC, it "chops" the AC signal to control speed, and you'll be limited on speed control much more than a 3 phase VFD. I want to say torque would be an issue as well, but don't quote me on that.

You're closest option for all single phase would be DC motors and controls, but your best bet is the standard VFD with a 3phase motor, IMO.
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What he said..

The Leeson is the only one with single in and out that I know of and it can be configured to run either way.
I personally would go single phase in and 3 phase out, it'll run better and a lot longer in a garage. When I wired my dads machine shop he had single phase where he lives and 3 phase was unavailable.
We built a phase converter 220 single in to 480v out for his mills and lathes and surface grinder and other 3 phase shop tools. We ran CNC fine like that with no issues.
I accidently stumbled across the Automation Direct single phase in 3 phase out drives about 10 years ago when I was engineering a project with a power stumbling block.
I personally like this setup but you gotta do whats right for you and your business. I would personally invest in a drive and motor so I could control speed without changing belts if I had to funds available to do so, its much more efficent to do..
 
Yes that's how my machines are set up. I have a number of single phase motors I could utilized for other things if speed control was more feasible, is why I was asking.
 
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