It is neither complicated, nor overly inflexible.
"Upstream" or external breakers at a load center are meant to protect the wire of their branch circuit. 30 A 3-Pole for most of mine.
The device or "system" - a 10EE, entire in this case - that is
connected to a branch is on its own, whether formally vetted to UL/CSA/TuV or just reasonably competent Engineering and/or sane DIY.
The 3-Phase generator drive motor's FLA is right on its data plate. Starting inrush is "as usual", kinda brutal in Amps, but mercifully VERY short.
A breaker MAY need "slo acting" selection, but not necessarily.
I'm short better numbers for you until I dig deeper into some OTHER things my MG 10EE needs patched.
DC Drives ramp up from an even gentler start than a VFD. No capacitor bank to charge. They don't HAVE a starting inrush, Ergo stress a "QO" breaker's sensitive nature not at all.
No-load, out of the machine, no belts, nor even gearbox, 15A 2-Pole @ 246VAC was fine for my bench-testing. An SSD has its own protection, but is optioned to deliver as much as 24 A @ 275 VDC if the 12 FLA nominal 230 VDC motor will even "suck it", locked-rotor or near-as-dammit. Generally, it will NOT.
So the "Day Job" version gets one of my 30A 3-P branches for its AC input side.
Sanity check: Thats actually a skosh MORE than a 10 HP Phase-Perfect or the RPC WHEN running in 10 HP-idler mode theoretically sustains (28 A or therebouts??)
So.. I'd GUESS an MG 10EE runs off 15 A ... or less, even at moderately heavy loading ..but benefits from 20A service. .so as to not annoy with the odd "nuisance tripout" on startup? Worse.. a stall whilst in a heavy cut?
Page Two:
Machine tools in general are built tough. A tad of locally high temps in the electron-mangling goods are not as big a problem
as STALLING whilst "in the cut" from a fault tripout. That risks damaging work as well as tooling, messing-up part of yer whole day with it.
Hence my supplying 30 A and trusting to the SSD Drive to monitor wisely for overloads.
Yah. I know. "that's easy for thermite to say".. he has a spare motor for each 10EE.
