VFD selectable outlet panel switch???

KnuckleDownKnives

KnuckleDownKnives

Time to make the doughnuts..
Joined
Feb 12, 2015
Messages
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Hi all. I'm working on getting materials together to make a power distribution panel for the output side of my VFD. I want to have four outlets wired and a switch that selects which one the VFD is powering so I can switch which machine I'll be running with just the turn of a switch. I'm using a Model KBAC-29 (1P) VFD. Currently my grinder has an IronHorse 3hp motor (MTRP-003-3BD36) on it.

If I'm reading everything right, this switch should this handle doing what I need?

I'm pretty sure I would run all 4 wires in (3 phase wires and ground) and all 4 wires back out to each outlet.


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That switch should work fine, but you should only switch the three phase conductors.
Equipment ground conductors should not be switched.
 
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I've wanted to do this same thing, and it would make my disc grinder build a lot more affordable. Assuming all motors are equal or lesser HP, is there any disadvantage of doing this? Other than you can't run more than one at a time? Not likely in a one man shop anyway, but still...
 
tmerkl said:
I've wanted to do this same thing, and it would make my disc grinder build a lot more affordable. Assuming all motors are equal or lesser HP, is there any disadvantage of doing this? Other than you can't run more than one at a time? Not likely in a one man shop anyway, but still...
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I have zero need to run more than one machine at the same time. As long as your VFD is rated higher than the motor you should be good. I have a 3hp motor and VFD, and for the price I plan on just making them all the same. You don't necessarily need a switch, I just don't want to have to plug and unplug machines as i go. A simple flip of the switch and your on another machine.
 
I have two similar setups, one rotary switch for switching between disc grinder and buffer. And another rotary switch for switching between my two grinders.

I'm super happy with this setup.

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JTknives said:
Salem has a rather slick multi machine setup on his big VFD. He also has a remote pendent that controls the speed.
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I've seen his setup somewhere on here, just nor sure of the exact parts he used.

Just ordered 2 of them, so If needed I can run up to 7 machines off the same VFD. Just need to run one switch into the other switch and it adds up to 4 more slots for future updates. For $23 total figured why not just get 2 of them now. It can sit in my electronics parts drawer with other. I plan on running pretty much what currenthill runs all of his on except on VFD and not 3. My first grinder is getting ready to get converted to direct drive in the next few months so want to get the electrical set up first so when i get the motor in and mounted all I need to do is plug it in a flip the switch. I've already got a 1.5HP 3 ph motor I'm either making a buffer out of or a disc grinder. I'ts not a TEFC but have plans to remedy the dust issue.
 
A word of caution: In the industrial world disconnecting the load side of a running VFD is a surefire way of burning it up. Not sure if the KB electric drives are the same way.
 
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