Recommendation? After all these yrs, wanna dial in VFD

[S.Grosvenor]

Good Day all!

I've searched for Salem's post on this subject without sucess, I have a KBAC 27 set up for 110 on a 1.5hp grinder, I want to use the same vfd for my 1hp Harig Super 612 SG and I'm sure i've read on here how to do that and cannot find it (as I'm not great with computer stuff).
I need your help to get me going in the right direction.

Ultimately I want to run my 1.5hp grinder, 1.5hp flat disk (to be added later) and my 1hp Super 612 on 120v, using the same KBAC 27

Thank you for any assistance you can provide.

 

[Stacy E. Apelt - Bladesmith]

Use the search engine and search, "Running three devices on one VFD". There are many threads on this with wiring diagrams and all.

 

[S.Grosvenor]

found them thanks!

 

[SirSpice]

The KB27D has a jumper for motor horsepower selection. It has settings for 0.75, 1, 1.5, and 2. I don't know what would happen if you were to use the 1.5 for a 1 hp motor.

 

[S.Grosvenor]

The KB27D has a jumper for motor horsepower selection. It has settings for 0.75, 1, 1.5, and 2. I don't know what would happen if you were to use the 1.5 for a 1 hp motor.

I've been researching that very topic, still trying to get that answered, waiting for a return phone call.

 

[Hella Bread]

so the way the “hp” setting works is essentially it sets the max output amperage around what kb thinks will cover majority of motors at that rated hp without fiddling with the trim pots so you have proper overload protection which will kick in if you exceed it for a certain amount of time and you don’t burn out the motor from overloading it. 2hp is 6.7a max, 1.5hp is 5.5a max, 1hp is 3.7a max.

If the jumper is set below your motor rating you’re just derating it to whatever output it would be at that amperage. If the jumper is set above your motor output rating. It’ll still run you just lose overload protection and risk burning up/killing the motor if it gets to the point of overload since the overload protection won’t kick in until way above what the motor is rated for

 

[Drew Riley]

I run my 2hp milling machine and a 1hp grinder off of the same VFD, I just wired a twist lock outlet to the output side of the VFD and have the male sided plugs ran to each of my machines.
As long as you have the VFD set for the biggest motor you're going to use, it will run both fine, you're just giving up (or rather raising the threshold of) the built in overcurrent protection from the VFD for the smaller motor, like Hella Bread was saying.

In practice, as long as you're not constantly over driving or stalling your machine, this shouldn't be a problem.

 

[S.Grosvenor]

All three up and running. Thanks for the Help.