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Can a Rotary Phase Converter Power a 10 kva-7.5 kva 480V-240V Transformer Reversed?

glen1966

Plastic
Joined
Sep 28, 2011
Location
Mi USA.
Can a rotary phase converter power a transformer?
The rotary phase converter to be used is a 15hp 220V, 28+/- amps, 3ph output.
I was told that a 10 kva or 7.5 kva, 480V/240V step-down 3Ph transformer powered in reverse would produce 480V 10-7.5 kva
The intended use is to power a old 1950s, 440V,3ph,7.5hp-3.5 ,11.1 amps dual speed lathe motor.
Will this setup work?
What issues might I expect e.g. volt/amp loss/gain,or safety issues?

Is there a VFD that would work as well for the same application?
Thanks.
 
RPC had no trouble running my transformer, but it was a 3 KVA feeding a 1 1/2 HP four speed 440V only motor. Your 10 KVA may be a little small for 7.5 HP
 
Acme sold me my transformer and recommended 2 to 1. If you follow that recommendation from a transformer manufacturer, you need 15 KVA for 7 1/2 HP
 
Thank you , just trying to power-up a W&S #3 M2700 7.5hp 440V 11.1amp load using shop voltage.I don't want to change motors or got to VFD if I can avoid it.
 
Changing motors or going to a VFD is frequently faster, simpler, and less costly, but all three techniques work. If your RPC and transformer are under too much load, the lathe motor will start slow, and it'll beat up the transformer and RPC if you do lots of start/stop cycles.
 








 
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