Re: [CAD_CAM_EDM_DRO] VFD's / Skates

Thank you for the explanation Jon, as for the extra 2HP... there's lots of
flashing L.E.D's on these things aren't there? : )

John He.

> The only part that knows the difference between single and 3-phase power
> is the rectifier (and also the capacitor bank). The current on the

rectifier

> diodes that are actually used in single phase service is quite a bit

higher

> than when used in 3-phase phase. this is what needs derating. So, yes,
> a 4-Hp inverter would be better able to handle the peak currents than
> a 2-Hp inverter. the inverter does NOT draw 4-Hp from the lines! Where
> would it get rid of that excess energy? It would have to start smoking,
> and it won't.
>
> I have a Yaskawa-made Magnetek-brand 1 Hp inverter, specified as 3-phase
> input, only. I looked up the power block that houses all the internal

power

> components, and found the rectifier diodes were VERY generously

overspecified,

> and I run it at full power from single phase power with no worries. I

can't

> guarantee that all of them are built like that, but it seems like thay

are.

> They are also designed to run with no forced cooling, just natural

convection,

> up to a 55 C ambient, or something like that. Running it out in the open
> with a small fan on it extends the ratings of the rectifier.
>
> Jon
>
>
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