Setting up a KBAC 27D to run two motors - pics/info requested

REK Knives

REK Knives

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Knifemaker / Craftsman / Service Provider
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Hey guys I have searched and found some interesting threads but can't find where anyone actually walks through exactly what they did, what parts to buy, what wiring diagrams to follow. So if anyone is running 2+ motors off of their 27D I would love to see some pics of the internals and know what switches etc. you purchased from where. Thanks a ton!:thumbup:
 
Have you thought about just installing wires with plugs on each motor and the box?
 
Keep searching, there are threads that show exactly which switches to use.
 
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Here are the threads that helped me. I was setting up a kbac24 but same basic idea.

http://www.bladeforums.com/forums/showthread.php/1273258-Help-with-switches?highlight=switches

http://www.bladeforums.com/forums/showthread.php/792391-Can-2-grinders-motors-be-hooked-up-to-the-same-VFD

http://www.bladeforums.com/forums/showthread.php/797438-Last-check-for-my-switch

Here is a pic of the end result.

LzsJBBs.jpg
[/IMG]
 
Here's what I use. Not the most elegant but it is the most flexible for me. It lets me run 4 different
Motors. Brian here guided me on this. ImageUploadedByTapatalk1438438218.981374.jpgImageUploadedByTapatalk1438438231.170866.jpg
Basically the female is on the vfd. Every motor gets the male plug.
 
jdm61 said:
Have you thought about just installing wires with plugs on each motor and the box?
Click to expand...

I would rather just wire up a switch... i think it would get old switching plugs, however, I do realize it is more safe so you don't fry your vfd. But I always power down my belt sander when switching anyway.

Scoli Forge said:
Here are the threads that helped me. I was setting up a kbac24 but same basic idea.

http://www.bladeforums.com/forums/showthread.php/1273258-Help-with-switches?highlight=switches

http://www.bladeforums.com/forums/showthread.php/792391-Can-2-grinders-motors-be-hooked-up-to-the-same-VFD

http://www.bladeforums.com/forums/showthread.php/797438-Last-check-for-my-switch

Here is a pic of the end result.

LzsJBBs.jpg
[/IMG]
Click to expand...

Thanks a ton man, the info and pics are exactly what I am looking for! Is there a way to wire the switch up to where it would not allow you to turn on one motor when the switch is set to the other one?

hsc3_90293 said:
Here's what I use. Not the most elegant but it is the most flexible for me. It lets me run 4 different
Motors. Brian here guided me on this. View attachment 565682View attachment 565683
Basically the female is on the vfd. Every motor gets the male plug.
Click to expand...

Good stuff I may do this for simplicity sake... we shall see!
 
That's what the switch does. It diverts the power from one motor to the other. As far as I know with the switch in place there is no other way to get power to the other motor if the switch isn't switched to that side.

Most people used a on-off-on switch. I opted for a on-on instead. It seems like it's personal preference from what I've read on it. I will be using Stacy's advice and turning the vfd off before I switch motors.

Remember to make sure the switch you choose can handle the amount of amps your motor is going to put out.
 
Just checking here... this bench grinder would be compatible w/ the KBAC 27D right?
 
if running multiple motors, be sure they're the same size. The KB board has a jumper to select motor size, and running a different size motor than the jumper setting is a good way to damage electronics
 
razor-edge-knives said:
Just checking here... this bench grinder would be compatible w/ the KBAC 27D right?
Click to expand...
That grinder is 3/4HP and should work with the 27D, but the 24D would do the job cheaper. Something to keep in mind is that you have to set a jumper inside the VFD to the HP of the motor you are running. To run two different HP motors such as one 1-1/2HP and another rated at 3/4HP you would have to open the box each time you switched motors and reset the jumper for the corresponding HP. That would be a royal PITA. It would work best if you were running two motors of equal HP so that you could wire it so you just flipped a switch to change motors, or just unplugged one from the VFD and Plugged in the other.

PS: Justin must type faster than I do :)
 
Thanks a ton guys... saved me a lot of heartache! lol

So I think I am gonna do it differently than I have seen in any threads to date... I want to have this wired up in a central box like you Scoli, but then I will have 5 motor options, I can simply power down the vfd then rotate to whichever motor I want and turn it back on. I already have the fwd/stop/rev switch wired into the vfd which is noice.
 
12345678910 said:
Why do you want that ?

Buffing ?


Look at a real buffer and see how much longer the shafts are

You need room to get in without hitting the motor



You can make up a buffer buffer using a large shaft, a pulley, pillow block bearings

and a belt to a motor down below


http://cms.cws.net/content/buffpolishgrind.com/images/baldor-mini-big.jpg
Click to expand...

Thanks for the link, I have thought about something similar!

A buffer would work as well but a tool rest would be nice, which is why a 6" bench grinder would be great. I use this for my serrated sharpening and profiling set up so I want to have 2 of the above motors run by my vfd and I will never have to switch wheels out.
 
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