A 50 amp 240 v will only run a 5 HP motor
I have had a simple single to three phase converter for over 30 years works grated
I was only a 1725 motor 3 hp and use a 3/4 single phase motor for starting the main motor and helping on starting motors up to 10 hp
Dave
No 3 phase power out your way Jim? 50 amps man that's not a lot to work with.
In my OP I noted above I have a DoAll grinder that is wired for 480V. The question: Has anyone actually tried to connect a 240V output VFD to a 3 phase transformer to produce 480V, 3 phase? I thought I would ask before I let all of the magic smoke out of a 5HP VFD. It seems like it might work, but............... To make it more interesting, the grinder has 3 motors: The hydraulic pump, the spindle, and the coolant pump so the motors would be switched in as needed. Sounds like a good way to fry a VFD, but I'm not sure.
Just thinking here (normally a dangerous condition ), I may not actually try it.
Opinions?
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Hi Jim,
I have not used a RPC to make 480v through transformers, but the idea would work- at least in theory.
maybe another way of doing it would be a wye start/ delta run,.
start the motor on low voltage to spin up, then switch to Hi Voltage delta for the run
I have 3 phase at the street, but I just don't want to pay to have it brought in. And then there is the permitting issues, would probably cost more than the service. I really don't want any inspectors around here for a number of other factors. My limitation is the wiring to the shop, I could pull in a 100 amp, single phase wiring. I have enough power at the distribution panel.
Is there some common Farm related reason for 3 phase that wouldn't raise any eyebrows? Then after they leave tap the supply for the shop. Or just pull out your roll of Ben Franklins and pretend to count it when the inspector shows up.