On Thu, 22 Oct 2015 18:33:16 -0700, Carla Fong
wrote:

Something to keep in mind with 1-phase in 3-phase out VFD's is that
above a certain motor horsepower (5 I think) you need to derate the VFD
by 50%.

We found this out when ordering the VFD for our 7.5 HP lathe - needed a
15 HP drive for it.

I don't remember the parameter that was the problem but the sales guy
made a convincing argument at the time.

Our VFD source for Westinghouse / Teco drives was dealerselectric.com

Carla


That's true if it's a 3-phase input VFD being used on single phase.
For VFD's designed for 1-phase input, it's already taken into account
in the rating. I have a little 1 Hp, 220V single phase in, 3-phase
out Rockwell like that.

Pete Keillor

We are drowning in information but starved for knowledge. -- John
Naisbitt, Megatrends


On 10/21/2015 7:16 PM, Bob La Londe wrote:
I was just looking on the Drives Warehouse website to see if they had any of
the 5HP Spedestar VFDs in stock, and I punched in the worng search
parameter. I found a pleasant surprise. They are listing Spedestar 1ph -
3ph VFDs upto 30HP now. Those big ones aren't cheap (not outrageously
expensive either), but it opens up a world of options in used equipment for
those of us running home shops or for folks running small shops that don't
have 3 phase power other than buying or building a big noisy rotary phase
converter.

The last time I looked the largest I found for 1ph-3ph was 5HP.