Re: Haas SMM2 3 PH Rotary Inverter
I think what he is talking about is the wire from the breaker to the convertor. They usually call for very heavy gauge wire as of course the convertor itself is a large motor.
I have a 20 and a 30 hp and it don't use anywhere near as large a wire as they would want you to. My 20 hp is hooked to the breaker with 8 or 10. My newest a 30 hp I think I used 4 or 6. I'm at home now, so can't check. Before getting the 30 hp hooked up, I ran two Haas VF-2's and a Hardinge CNC lathe off of that 20 hp convertor and 8 or 10 wire. It is all over-kill. You will never max out all of the motors and etc on the machines, just never happens.
I have a neighbor with a fabricating shop and he has a 30 or 40 hp to run a press-break and a shear, (over-kill, yes) and his "electrician," used like 00 gauge to hook his up. It is like the size of broom sticks! He could even get to go into the panel correctly! Just kind of sticks out of the box.
You will be fine with the 3 or even smaller. That said, I'm not an electrician, but I did stay at a Holiday Inn express once. You do what you feel is necessary.
Mike
P.S.: Most large motors start with a full load on them, in other words powering whatever they will power, like a hydraulic pump or lathe spindle or fan, etc. On a convertor, all that is being started is the motor itself and it is missing some of its shaft too!
M
Two Haas VF-2's, Haas HA5C, Haas HRT-9, Hardinge CHNC 1, Bother HS-300 Wire EDM, BobCAD V23, BobCAD V28