One VFD for both lathe and mill

I would get a switch rated at least 4 times the expected current, not necessarily for electrical reasons but because the switch will be better built internally with stronger parts less likely to melt or break apart and fry your VFD output stage
Import switches are notoriously weak and flimsy
 
I used relays to switch between lathe and mill, including feeds for the MachTach. I added a relay connected to an output from the VFD so that the change could not be made unless the VFD output was at zero. Prevents the much-warned chance of burning out the VFD by having it powered with no load.

Cooter's suggestion will be the cheapest, but you have to make sure you never turn the VFD output on while the plug is disconnected. BTW, all the relays cost around $100. Could be done cheaper with PCB-mounted relays, though.
 
Easier and more user friendly in the long run just to use two VFDs. IMHO
 
I dont know where you are finding VFDs for $40, but I'd like to know.....

Dont ever but plugs at home depot they are way over priced....


 
I paid $56, they are 65 now and the same one is on for 29.99 but the seller is away (scam possible):


So far mine has worked perfectly

Thanks for the links
 
Just remember all the VFD manuals say no switches between the VFD and the motor? Think they just make that stuff up?
 
Just remember all the VFD manuals say no switches between the VFD and the motor? Think they just make that stuff up?

I have a reversing switch wired to my VFD and then to the motor on my lathe, it works great.... Yes! That is a bunch of made up garbage.... lol
 
I wired my old drum switch the same way, also added an external pot for speed control. Don't trust those membrane switches to last long.vfd final.jpg
 
Wire a female plug to the VFD and then plug in the machine that you want to use.....
PERFECT NO FAIL way to do it & the price would be right also. With a little handy wiring, he could also have remote start/stop & speed control located at each machine. VFD's don't like start/stop, fwd/rev controls on output. All controls need to be in the VFD drive unit.
 
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