On 16 July 2018 at 14:37, Gene Heskett <ghesk...@shentel.net> wrote: >> While on the subject of voltage-increasing, apparently it is possible >> to re-wire the input stage of a 440V VFD into a doubler circuit to >> allow it to run (derated) off of 240V. >> https://en.wikipedia.org/wiki/Voltage_doubler#Delon_circuit > > Due to the physical size of the capacitors involved, I'd think it > impossible to shoehorn it into the 440 volt VFD.
The idea is to re-arrange the existing input diodes and capacitors into a doubler arrangement. But you need to derate because caps sized for 3-phase full-wave are now seeing single-phase half-wave rectification. -- atp "A motorcycle is a bicycle with a pandemonium attachment and is designed for the especial use of mechanical geniuses, daredevils and lunatics." — George Fitch, Atlanta Constitution Newspaper, 1916 ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
