I thought I would throw in my two cents also... I have a home built rotary phase converter based on a 10 hp 200/400 volt 3 phase motor. Due to the odd nameplate voltage (for the US), the motor was very cheap to purchase.
I run a variety of machines off this phase converter from time to time. The largest is a 10 hp 3 phase air compressor. To avoid overheating the compressor motor due to phase inbalances, I simply turned the cut out pressure down from 175 psi to 150 psi. From time to time I need to test motors and drives. Running 3 phase input, 240 volt AC drives off the phase converter has never been a problem. I once had to setup a new Siemens 7.5 KW 460 volt 611U servo drive so it could operate a unique Italian servo motor. I had a 7.5 KVA 480 to 240 transformer. So I ran the phase converter output into the 240 volt side of the transformer and boosted the voltage up to about 480-500 volts. The Siemens drive was very happy running off the phase converted, and transformed AC power. One more thing; A real 5 hp 240 volt single phase motors draw about 24-27 amps. When I am running the 10 hp compressor off the phase converter, the input current to the phase converter peaks at about 50 amps as the pressure builds. I have a 100 amp feed into my garage and even with the phase converter and other machines running, I have never tripped the 100 amp breaker that feeds the shop. Having a phase converter is very handy. Dave ------------------------------------------------------------------------------ Colocation vs. Managed Hosting A question and answer guide to determining the best fit for your organization - today and in the future. http://p.sf.net/sfu/internap-sfd2d _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
