Re: [CAD_CAM_EDM_DRO] Inverters/phase converters

The single phase to 3 phase current ratio is about 2 to 1 (~1.85 if I
recall).

>
> I was told by the EMS/ Yaskawa people that a 3 phase drive powered by

single phase will work if the output of the unit is derated. You don't want
to overheat the 3 phase bridge rectifier. I can't recall what the actual
percent value was but I think 20 or 30 % was what they quoted. If you can
keep the rectifiers cool, I think you could drive them really hard. Most
VFD's come with temp sensors and fans, some don't Perhaps a fan retrofit
would help the device live if it came with out one.

>

All the VFD's I have used that allow both 440-480 and 220-240 will run twice
the hp at the higher voltage. This nicely works for derating if feeding
single phase in at what would have been max rating at 240.

> One other idea would be to step up voltage to the device so current is

lower through the rectifiers? I'm not sure if this would work. Many VFD's
will accept 440 volts?

>
> Use this info with caution.
>
> Peter
> THRD, Inc.
>
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