Grinder VFD Location?

So I've read about people saying the motor handle handle double the hertz? So I can set the VFD max from 60 to 120?
 
Ghostman3 said:
But it's ok for the motor? I know the VFD can do it, just no manual on the motor.
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There's not really a good answer unless you're using an inverter duty motor rated to X RPM over 60hz RPM, which I doubt you are using.

I can tell you, having worked at a Regal Beloit (Leeson) factory, there wasn't any difference in bearings or balancing between a 56 frame 2hp 1750 RPM motor and a 56 frame 2hp 3600 RPM motor.
 
Not sure, I don't know a lot about motors. I bought a 2 HP from automation direct. Very inexpensive and works great plus a warranty.
If you post your motor plate maybe someone that knows motors can help.
 
It is a 3600rpm motor I know that. It was a vfd motor package from dealers electric. I'll see if I can dig up the motor specs.


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You shouldn't ever need 120 Hz then. At 60hz with a 4.5" drive wheel you're talking 4200 sfm.
 
Ok I have a 5" drive wheel so I'm sure that's plenty fast. It does seem fast but just wasn't sure if there was something I was missing out on.


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I felt I should follow up.

I found a very nice BUD Industries box at Zoro Tool (Grainger). Making my VFD fit was quite a chore. The box had knockouts on four sides. Obviously, you can't screw anything to a knockout. I had to use a mill to make an adaptor from aluminum.

I screwed the VFD and adaptor to the box and ran 600V cord out through two knockouts.

I love the motor I got, and I love the price, but it had a crazy stainless steel conduit connector which was snapped off at the junction box. I had to drill and saw it out, and then I cobbled a replacement together from Home Depot parts.

I'm still waiting for an ethernet connector that will go through the box. Found it on Ebay. Right now, the box door is ajar, and the cable goes through the crack.

I need to make a new platform so I can move the motor to the right about two inches, and I have to make a bracket to hold the remote panel. I plan to put it by the motor so I will have a little flat work space on the front part of the platform.

10%2030%2016%20Hitachi%20VFD%20mounted%20in%20new%20box%20with%20wires%20small_zpsywbx7owa.jpg


10%2031%2016%20Belt%20grinder%20and%20VFD%20with%20VFD%20box%20wired%20up%20and%20working%20small_zps6xykf3gl.jpg
 
Can you elaborate more on that little switch panel and how you built it?


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How can you possibly change the belt like that ?

How about putting the motor on the other side and reversing the motor.

10%2031%2016%20Belt%20grinder%20and%20VFD%20with%20VFD%20box%20wired%20up%20and%20working%20small_zps6xykf3gl.jpg
 
More parts arrived, and now the grinder is in a form which is, if not final, at least fully operational.

I think this information will be useful to other people, so I will pass it on. I needed a way to run an ethernet cable through the wall of the VFD box so I could have a remote panel to control the VFD. Someone suggested something called a "gland." It turned out that wasn't a great idea. A gland is sort of like a fancy rubber cork a wire passes through. You can't disconnected a cable from a gland quickly. What I needed was a coupler, and they're not that easy to find.

I hit Ebay and found what I needed, listed under "Cat6 RJ45 Shielded Industrial Panelmount Bulkhead Coupler." It's a heavy black PVC coupler with threads on each end. It also has an ethernet receptacle on each end. You put it through a 3/4" knockout and tighten it, and you're in business. I got a 1-foot ethernet cable from Monoprice, to connect the VFD to the coupler. I also got a 5-foot cable to connect the coupler to the panel.

I made an aluminum mount for the panel and chose the best location I could. It's mounted in front of the grinder, away from the belt. If I had put it anywhere else, it would have obstructed the work surface to the right of the grinder, and it would have gotten banged up.

I need to tidy things up, but it looks like it will work great.

I also put two twist-lock connnectors in the cord going from the VFD to the motor. Now if I need to move the grinder or work on the VFD, I can leave the motor in place and avoid messing with the wiring.

I will post a photo of the coupler and a photo of the grinder.

11%2004%2016%20VFD%20enclosure%20with%20ethernet%20coupling%20installed%2001_zps66txxkyh.jpg


11%2004%2016%20VFD%20panel%20mounted%20on%20grinder%20platform%20small_zpsy3xtd2df.jpg
 
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