Running 230v single phase from 208 3 phase
Running 230v single phase from 208 3 phase
(OP)
Need to run 230 volt single phase pumps from a generator that simultaneously produces 480v and 208v 3 phase power.
Can I hook pumps up to 2 legs of the 208 side and adjust voltage up. I am thinking that as long as single leg of 208v side is no more than 130v and my high voltage side is no more than 500v I should be able to run whatever we need to run. Thanks
Can I hook pumps up to 2 legs of the 208 side and adjust voltage up. I am thinking that as long as single leg of 208v side is no more than 130v and my high voltage side is no more than 500v I should be able to run whatever we need to run. Thanks





RE: Running 230v single phase from 208 3 phase
(Just remember to distribute the pumps on the three phases as equally as possible. You indicated multiple pumps but not how many; if you have three, connect one to 'A' and 'B', one to 'B' and 'C', and the last to 'C' and 'A', etc)
RE: Running 230v single phase from 208 3 phase
RE: Running 230v single phase from 208 3 phase
If there is any doubt it would be worth checking the currents in all three phases.
RE: Running 230v single phase from 208 3 phase
Are 480V loads being served concurrently with 208V loads? For the usual 12-lead low-voltage generator stator, excitation is adjusted for 120V per coil for nominal 208V, but 139V per coil {480V/{sqrt3)/2} for 480V service. Note with 139V/coil, generated voltage will be 480V ø-ø, but 240V [not 208V] at the ungrounded stator-coil taps. Typically the stator is connected 480V T1-T2-T3, neutral connected to T10/T11/T12, but it sounds like mid-winding taps may also be serving load using additional connections to T4/T7, T5/T8 and T6/T9. When operated in this mode, understand that the nominal “208V” [“240V”] output may be quite high—139V ø-n in place of the anticipated/desired 120V. Be aware that 130V/coil on the typical 12-lead stator corresponds to 225 and/or 450V ø-ø.
Generator loading is a little more complex, in that the rated coil current cannot safely/reliably be exceeded in the steady state, so coils connected to the neutral point will be loaded by equipment served at both voltages, and overloading of that coil set may occur without appropriate monitoring and protection.
RE: Running 230v single phase from 208 3 phase